#Руководства
Разбираемся, как сократить повторяющийся код в C++ и сэкономить время.
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Пишет о программировании, в свободное время создаёт игры. Мечтает открыть свою студию и выпускать ламповые RPG.
Это шестая часть из серии статей «Глубокое погружение в C++». В прошлый раз мы узнали, как использовать функции и процедуры. Сейчас поговорим о циклах while, do-while и for.
Циклы — это разновидность условных конструкций. Они позволяют выполнять команды несколько раз, если определённое утверждение верно. Например, с помощью циклов можно пять раз вывести на экран какую-нибудь надпись или посчитать сумму всех чисел.
Запись цикла while выглядит так:
Этот код выполняется следующим образом:
- Программа проверяет, верно ли утверждение.
- Выполняются инструкции в теле цикла.
- Программа возвращается к пункту 1.
То есть пока утверждение верно (i < 100), цикл будет повторять одни и те же действия. Цикл, который пять раз выводит сообщение «Hello, World!»:
int i = 0;
while(i < 5)
{
std::cout << "Hello, World! \n";
i++;
}
Посмотрим на вывод:
Обратите внимание на переменную i — она играет роль счётчика, к которому в каждом шаге цикла прибавляется единица. Это нужно, чтобы инструкции выполнялись только определённое количество раз.
Один шаг цикла называется итерацией, а счётчик — итератором. Поэтому чаще всего для счётчика создаётся переменная i.
Важно! Следите за тем, чтобы выход из цикла был возможен, иначе он будет выполняться бесконечно.
Если внутри цикла складываются числа или что-то выводится, то нагрузка будет минимальной. Если же это какие-то ресурсозатратные вычисления, то выполнение такого цикла может заставить компьютер зависнуть.
Когда нам нужно вмешаться в работу цикла, мы используем операторы break и continue.
Оператор break прерывает выполнение цикла:
int sum = 0;
int maxSum = 50;
int i = 0;
while(i < 100)
{
sum += i;
i++;
if(sum >= maxSum)
{
break;
}
}
std::cout << "i = " << i << "\nsum = " << sum << "\n";
Этот цикл должен посчитать сумму всех чисел от одного до ста. Но мы указали максимальное значение для переменной sum, поэтому цикл прервётся, как только sum станет больше maxSum.
Компилятор умеет отличать оператор break в конструкции switch от оператора break, который прерывает циклы. Поэтому можно спокойно писать вот такой код:
int action = 0;
bool end = false;
//Этот цикл будет бесконечным, если его не прервать изнутри
while(true)
{
std::cout << "Exit? \n1 - Yes\n0 - No\nAction: ";
std::cin >> action;
switch(action)
{
case 1:
std::cout << "Good bye!\n";
end = true;
break;
case 0:
std::cout << "Try again!\n";
}
if(end)
{
break;
}
}
Вот как это будет работать:
Важно! Оператор break внутри конструкции switch не может прервать цикл.
Иногда нам нужно пропустить одну итерацию и перейти к следующей. Для этого используем оператор continue.
int i = 0;
while(i < 100)
{
i++;
//
if(i % 3 == 0)
{
continue;
}
std::cout << " " << i;
}
std::cout << "\n";
Этот цикл выведет все числа от одного до ста, кроме тех, которые делятся на три без остатка.
Цикл do-while похож на while, но он сначала выполняет одну итерацию и только потом проверяет верность утверждения:
while(false)
{
//Ничего не выводится
std::cout << "Hello! \n";
}
do
{
//Надпись будет выведена один раз
std::cout << "Bye! \n";
}
while(false);
Вот результат:
Если для работы цикла нужен счётчик, то его запись можно сократить с помощью цикла for, записав логику в скобки:
Вот пример такого цикла:
int sum = 0;
for(int i = 0; i < 200; i++)
{
sum += i;
}
std::cout << "sum = " << sum << "\n";
В результате мы получим сумму всех чисел от 1 до 200:
Циклы, как и другие конструкции, можно размещать внутри других циклов. Вот, например, как вывести сетку с помощью for:
for(int i = 0; i < 10; i++)
{
//Обратите внимание, что во вложенном цикле должен использоваться другой итератор. В данном случае j вместо i
for(int j = 0; j < 10; j++)
{
std::cout << " + ";
}
std::cout << "\n";
}
Получаем результат:
Важно! Операторы break и continue влияют на тот цикл, в котором они находятся, а не на родительский.
Циклы — одни из самых часто используемых конструкций в программировании. Они нужны при чтении данных из файлов, сортировке, отрисовке графики и так далее. Одно из самых полезных применений циклов связано с массивами, о работе с которыми будет отдельная статья.
Курс с трудоустройством: «Профессия Разработчик С++
с нуля + ИИ»
Узнать о курсе
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<h1 class="article-preview__title">Циклы for, while и do-while в С++ для новичков: 6-я часть гайда по языку программирования</h1>
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Евгений Кучерявый </div>
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Пишет о программировании, в свободное время создаёт игры. Мечтает открыть свою студию и выпускать ламповые RPG. </div>
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<div data-ui-id="post" data-reset-type="class" data-editor-version="3.2.8-rc1" class="stk-post stk-layout_12col_18068 stk-theme_26309" data-stk="{"images":[{"id":7436,"alt":"","caption":""},{"id":7435,"alt":"","caption":""},{"id":7437,"alt":"","caption":""},{"id":7432,"alt":"","caption":""},{"id":7434,"alt":"","caption":""},{"id":7433,"alt":"","caption":""},{"id":7430,"alt":"","caption":""},{"id":7429,"alt":"","caption":""},{"id":7431,"alt":"","caption":""}]}" data-layout-type="auto" data-ce-tag="post"><div class="stk-grid stk-theme_26309__mb_15 stk-grid__layout_reverse" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><p class="stk-reset" data-ce-tag="paragraph">Это шестая часть из серии статей <strong class="stk-reset">«Глубокое погружение в C++»</strong>. В <a href="https://skillbox.ru/media/code/izuchaem_c_chast_5_funktsii_i_protsedury/" target="_blank" class="stk-reset">прошлый раз</a> мы узнали, как использовать функции и процедуры. Сейчас поговорим о циклах <em class="stk-reset">while, do-while</em> и<em class="stk-reset"> for.</em></p><p class="stk-reset " data-ce-tag="paragraph">Циклы — это разновидность условных конструкций. Они позволяют выполнять команды несколько раз, если определённое утверждение верно. Например, с помощью циклов можно пять раз вывести на экран какую-нибудь надпись или посчитать сумму всех чисел.</p></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Цикл while в C++</h2><p class="stk-reset stk-theme_26309__mb_05" data-ce-tag="paragraph">Запись цикла <em class="stk-reset">while</em> выглядит так:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_6a4e9b3ae3023faad72ace61e6264ce47ed78056.png.webp" data-image-id='7434' data-image-name='image5.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_6a4e9b3ae3023faad72ace61e6264ce47ed78056.png" data-image-id='7434' data-image-name='image5.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div><p class="stk-reset " data-ce-tag="paragraph">Этот код выполняется следующим образом:</p><ul class="stk-reset " data-ce-tag="list"><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">Программа проверяет, верно ли утверждение.</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">Выполняются инструкции в теле цикла.</span></li><li class="stk-list-item stk-reset " data-ce-tag="list-item"><span class="stk-reset">Программа возвращается к пункту 1.</span></li></ul><p class="stk-reset " data-ce-tag="paragraph">То есть пока утверждение верно<em class="stk-reset"> (i < 100),</em> цикл будет повторять одни и те же действия. Цикл, который пять раз выводит сообщение «Hello, World!»:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button">
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</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #aaaaaa;"><span class="hljs-keyword" style="color: #ffff55;">int</span> i = <span class="hljs-number" style="color: #ff55ff;">0</span>;
<span class="hljs-keyword" style="color: #ffff55;">while</span>(i < <span class="hljs-number" style="color: #ff55ff;">5</span>)
{
<span class="hljs-built_in" style="color: #ff55ff;">std</span>::<span class="hljs-built_in" style="color: #ff55ff;">cout</span> << <span class="hljs-string" style="color: #ff55ff;">"Hello, World! \n"</span>;
i++;
}
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure></div><p class="stk-reset " data-ce-tag="paragraph">Посмотрим на вывод:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button">
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<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_27e9aa5bdf801f94f7728fe14d1ac08405e5a691.png.webp" data-image-id='7431' data-image-name='image1.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_27e9aa5bdf801f94f7728fe14d1ac08405e5a691.png" data-image-id='7431' data-image-name='image1.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div><p class="stk-reset " data-ce-tag="paragraph">Обратите внимание на переменную <em class="stk-reset">i —</em> она играет роль счётчика, к которому в каждом шаге цикла прибавляется единица. Это нужно, чтобы инструкции выполнялись только определённое количество раз.</p><p class="stk-reset " data-ce-tag="paragraph">Один шаг цикла называется <strong class="stk-reset">итерацией,</strong> а счётчик — <strong class="stk-reset">итератором.</strong> Поэтому чаще всего для счётчика создаётся переменная <em class="stk-reset">i</em>.</p><div class="sklbx-quote-2 stk-container" data-ce-tag="container"><div class="sklbx-quote-2 stk-container" data-ce-tag="container"><p class="stk-reset" data-ce-tag="paragraph">Важно! Следите за тем, чтобы выход из цикла был возможен, иначе он будет выполняться бесконечно.</p></div></div><p class="stk-reset " data-ce-tag="paragraph">Если внутри цикла складываются числа или что-то выводится, то нагрузка будет минимальной. Если же это какие-то ресурсозатратные вычисления, то выполнение такого цикла может заставить компьютер зависнуть.</p><p class="stk-reset " data-ce-tag="paragraph">Когда нам нужно вмешаться в работу цикла, мы используем операторы<em class="stk-reset"> break</em> и <em class="stk-reset">continue</em>.</p></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Оператор <em class="stk-reset">break</em></h2><p class="stk-reset " data-ce-tag="paragraph">Оператор <em class="stk-reset">break</em> прерывает выполнение цикла:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-keyword" style="color: #96cbfe;">int</span> sum = <span class="hljs-number" style="color: #ff73fd;">0</span>;
<span class="hljs-keyword" style="color: #96cbfe;">int</span> maxSum = <span class="hljs-number" style="color: #ff73fd;">50</span>;
<span class="hljs-keyword" style="color: #96cbfe;">int</span> i = <span class="hljs-number" style="color: #ff73fd;">0</span>;
<span class="hljs-keyword" style="color: #96cbfe;">while</span>(i < <span class="hljs-number" style="color: #ff73fd;">100</span>)
{
sum += i;
i++;
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(sum >= maxSum)
{
<span class="hljs-keyword" style="color: #96cbfe;">break</span>;
}
}
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"i = "</span> << i << <span class="hljs-string" style="color: #a8ff60;">"\nsum = "</span> << sum << <span class="hljs-string" style="color: #a8ff60;">"\n"</span>;
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure></div><p class="stk-reset" data-ce-tag="paragraph">Этот цикл должен посчитать сумму всех чисел от одного до ста. Но мы указали максимальное значение для переменной <em class="stk-reset">sum</em>, поэтому цикл прервётся, как только <em class="stk-reset">sum</em> станет больше <em class="stk-reset">maxSum</em>.</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div data-ce-tag="mask" class="stk-mask"><picture >
<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_db52642fc67f6c7c46657360f234a883af322464.png.webp" data-image-id='7430' data-image-name='image3.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_db52642fc67f6c7c46657360f234a883af322464.png" data-image-id='7430' data-image-name='image3.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div><p class="stk-reset " data-ce-tag="paragraph">Компилятор умеет отличать оператор <em class="stk-reset">break</em> в конструкции <em class="stk-reset">switch</em> от оператора <em class="stk-reset">break</em>, который прерывает циклы. Поэтому можно спокойно писать вот такой код:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-keyword" style="color: #96cbfe;">int</span> action = <span class="hljs-number" style="color: #ff73fd;">0</span>;
<span class="hljs-keyword" style="color: #96cbfe;">bool</span> end = <span class="hljs-literal" style="color: #c6c5fe;">false</span>;
<span class="hljs-comment" style="color: #7c7c7c;">//Этот цикл будет бесконечным, если его не прервать изнутри</span>
<span class="hljs-keyword" style="color: #96cbfe;">while</span>(<span class="hljs-literal" style="color: #c6c5fe;">true</span>)
{
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"Exit? \n1 - Yes\n0 - No\nAction: "</span>;
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cin</span> >> action;
<span class="hljs-keyword" style="color: #96cbfe;">switch</span>(action)
{
<span class="hljs-keyword" style="color: #96cbfe;">case</span> <span class="hljs-number" style="color: #ff73fd;">1</span>:
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"Good bye!\n"</span>;
end = <span class="hljs-literal" style="color: #c6c5fe;">true</span>;
<span class="hljs-keyword" style="color: #96cbfe;">break</span>;
<span class="hljs-keyword" style="color: #96cbfe;">case</span> <span class="hljs-number" style="color: #ff73fd;">0</span>:
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"Try again!\n"</span>;
}
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(end)
{
<span class="hljs-keyword" style="color: #96cbfe;">break</span>;
}
}
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure></div><p class="stk-reset" data-ce-tag="paragraph">Вот как это будет работать:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_d58f50d1222620cd1cfe95da3a91221bd0d26e65.png.webp" data-image-id='7433' data-image-name='image4.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_d58f50d1222620cd1cfe95da3a91221bd0d26e65.png" data-image-id='7433' data-image-name='image4.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div><div class="sklbx-quote-2 stk-container" data-ce-tag="container"><div class="sklbx-quote-2 stk-container" data-ce-tag="container"><p class="stk-reset" data-ce-tag="paragraph">Важно! Оператор break внутри конструкции switch не может прервать цикл.</p></div></div></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Оператор <em class="stk-reset">continue</em></h2><p class="stk-reset " data-ce-tag="paragraph">Иногда нам нужно пропустить одну итерацию и перейти к следующей. Для этого используем оператор <em class="stk-reset">continue</em>.</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-keyword" style="color: #96cbfe;">int</span> i = <span class="hljs-number" style="color: #ff73fd;">0</span>;
<span class="hljs-keyword" style="color: #96cbfe;">while</span>(i < <span class="hljs-number" style="color: #ff73fd;">100</span>)
{
i++;
<span class="hljs-comment" style="color: #7c7c7c;">//</span>
<span class="hljs-keyword" style="color: #96cbfe;">if</span>(i % <span class="hljs-number" style="color: #ff73fd;">3</span> == <span class="hljs-number" style="color: #ff73fd;">0</span>)
{
<span class="hljs-keyword" style="color: #96cbfe;">continue</span>;
}
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">" "</span> << i;
}
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"\n"</span>;
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure></div><p class="stk-reset" data-ce-tag="paragraph">Этот цикл выведет все числа от одного до ста, кроме тех, которые делятся на три без остатка.</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div data-ce-tag="mask" class="stk-mask"><picture >
<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_4fb6fa4fbc0158ec7cf1e48acc6733dd567fe239.png.webp" data-image-id='7436' data-image-name='image9.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_4fb6fa4fbc0158ec7cf1e48acc6733dd567fe239.png" data-image-id='7436' data-image-name='image9.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Цикл <em class="stk-reset">do-while</em> в C++</h2><p class="stk-reset " data-ce-tag="paragraph">Цикл <em class="stk-reset">do-while</em> похож на <em class="stk-reset">while</em>, но он сначала выполняет одну итерацию и только потом проверяет верность утверждения:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-keyword" style="color: #96cbfe;">while</span>(<span class="hljs-literal" style="color: #c6c5fe;">false</span>)
{
<span class="hljs-comment" style="color: #7c7c7c;">//Ничего не выводится</span>
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"Hello! \n"</span>;
}
<span class="hljs-keyword" style="color: #96cbfe;">do</span>
{
<span class="hljs-comment" style="color: #7c7c7c;">//Надпись будет выведена один раз</span>
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"Bye! \n"</span>;
}
<span class="hljs-keyword" style="color: #96cbfe;">while</span>(<span class="hljs-literal" style="color: #c6c5fe;">false</span>);
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure></div><p class="stk-reset" data-ce-tag="paragraph">Вот результат:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div data-ce-tag="mask" class="stk-mask"><picture >
<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_93b8888c66d5103a8bb4f5fd89e04622d16558ec.png.webp" data-image-id='7435' data-image-name='image8.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_93b8888c66d5103a8bb4f5fd89e04622d16558ec.png" data-image-id='7435' data-image-name='image8.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Цикл for в C++</h2><p class="stk-reset " data-ce-tag="paragraph">Если для работы цикла нужен счётчик, то его запись можно сократить с помощью цикла <em class="stk-reset">for, </em>записав логику в скобки:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_c3d4b76cd89b05f2c8e5da53f69c6d45806e9160.png.webp" data-image-id='7437' data-image-name='image7.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133907062020_c3d4b76cd89b05f2c8e5da53f69c6d45806e9160.png" data-image-id='7437' data-image-name='image7.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div><p class="stk-reset " data-ce-tag="paragraph">Вот пример такого цикла:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-keyword" style="color: #96cbfe;">int</span> sum = <span class="hljs-number" style="color: #ff73fd;">0</span>;
<span class="hljs-keyword" style="color: #96cbfe;">for</span>(<span class="hljs-keyword" style="color: #96cbfe;">int</span> i = <span class="hljs-number" style="color: #ff73fd;">0</span>; i < <span class="hljs-number" style="color: #ff73fd;">200</span>; i++)
{
sum += i;
}
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"sum = "</span> << sum << <span class="hljs-string" style="color: #a8ff60;">"\n"</span>;
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure></div><p class="stk-reset" data-ce-tag="paragraph">В результате мы получим сумму всех чисел от 1 до 200:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_7b64da46b2dc4329c15be64aeef9e636261e678c.png.webp" data-image-id='7432' data-image-name='image6.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_7b64da46b2dc4329c15be64aeef9e636261e678c.png" data-image-id='7432' data-image-name='image6.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div></div></div><div class="stk-grid" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Вложенные циклы</h2><p class="stk-reset" data-ce-tag="paragraph">Циклы, как и другие конструкции, можно размещать внутри других циклов. Вот, например, как вывести сетку с помощью <em class="stk-reset">for</em>:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
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</div><figure class="stk-reset stk-embed-figure stk-embed_rendered" data-ce-tag="embed"><code class="stk-reset stk-code"><pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: #000000; color: #f8f8f8;"><span class="hljs-keyword" style="color: #96cbfe;">for</span>(<span class="hljs-keyword" style="color: #96cbfe;">int</span> i = <span class="hljs-number" style="color: #ff73fd;">0</span>; i < <span class="hljs-number" style="color: #ff73fd;">10</span>; i++)
{
<span class="hljs-comment" style="color: #7c7c7c;">//Обратите внимание, что во вложенном цикле должен использоваться другой итератор. В данном случае j вместо i</span>
<span class="hljs-keyword" style="color: #96cbfe;">for</span>(<span class="hljs-keyword" style="color: #96cbfe;">int</span> j = <span class="hljs-number" style="color: #ff73fd;">0</span>; j < <span class="hljs-number" style="color: #ff73fd;">10</span>; j++)
{
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">" + "</span>;
}
<span class="hljs-built_in">std</span>::<span class="hljs-built_in">cout</span> << <span class="hljs-string" style="color: #a8ff60;">"\n"</span>;
}
</pre></code><figcaption class="stk-reset stk-description" data-ce-tag="description"></figcaption></figure></div><p class="stk-reset" data-ce-tag="paragraph">Получаем результат:</p><div class="stk-container sklbx-browser" data-ce-tag="container" data-container-name="Окно браузера"><div class="sklbx-browser__header">
<div class="sklbx-browser__button">
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<div class="sklbx-browser__button">
</div>
</div><figure class="stk-reset stk-image-figure" data-ce-tag="image-figure"><div data-ce-tag="mask" class="stk-mask"><picture >
<source srcset="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_e3ea06ecc4efe66fd609360c227a5daace25eda6.png.webp" data-image-id='7429' data-image-name='image2.png' class='stk-image stk-reset' loading='lazy' type='image/webp' />
<img src="https://248006.selcdn.ru/main/upload/setka_images/11133807062020_e3ea06ecc4efe66fd609360c227a5daace25eda6.png" data-image-id='7429' data-image-name='image2.png' class='stk-image stk-reset' loading='lazy' />
</picture></div></figure></div><div class="sklbx-quote-2 stk-container" data-ce-tag="container"><div class="sklbx-quote-2 stk-container" data-ce-tag="container"><p class="stk-reset" data-ce-tag="paragraph">Важно! Операторы break и continue влияют на тот цикл, в котором они находятся, а не на родительский.</p></div></div></div></div><div class="stk-grid stk-theme_26309__mb_15" data-ce-tag="grid"><div data-col-width="12" class="stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><h2 class="stk-reset stk-theme_26309__style_large_header stk-theme_26309__mb_05" data-ce-tag="paragraph">Заключение</h2><p class="stk-reset " data-ce-tag="paragraph">Циклы — одни из самых часто используемых конструкций в программировании. Они нужны при чтении данных из файлов, сортировке, отрисовке графики и так далее. Одно из самых полезных применений циклов связано с массивами, о работе с которыми будет <a class="stk-reset" href="https://skillbox.ru/media/code/izuchaem_c_chast_7_massivy_i_rabota_s_nimi/" target="_blank">отдельная</a> статья.</p><div class="stk-grid" data-stk-css="stkcKtFx" data-ce-tag="grid"><div data-col-width="12" class="stk-theme_26309__pad_round_1 stk-grid-col stk-grid-col_last" data-ce-tag="grid-col"><p class=" stk-theme_26309__style_small_text stk-reset stk-theme_26309__mb_05" data-ce-tag="paragraph"><strong class="stk-reset">Читайте также:</strong></p><ul class=" stk-theme_26309__style_small_text stk-theme_26309__pad_hor_1 stk-reset" data-ce-tag="list"><li class="stk-list-item stk-reset stk-theme_26309__style_small_text" data-ce-tag="list-item"><a class="stk-reset" href="https://skillbox.ru/media/code/oop_umerlo_da_zdravstvuet_oop/" target="_blank">ООП умерло? Да здравствует ООП!</a></li><li class="stk-list-item stk-reset stk-theme_26309__style_small_text" data-ce-tag="list-item"><a class="stk-reset" href="https://skillbox.ru/media/code/chuzhoy_kod_kratkiy_likbez_po_ispolzovaniyu/" target="_blank">Чужой код: краткий ликбез по использованию</a></li><li class="stk-list-item stk-reset stk-theme_26309__style_small_text" data-ce-tag="list-item"><a class="stk-reset" href="https://skillbox.ru/media/code/yazyk_programmirovaniya_r_nichego_lishnego_tolko_rabota_s_dannymi/" target="_blank">Язык программирования R: ничего лишнего, только работа с данными</a></li></ul></div></div></div></div><style data-stk-css="stkcKtFx" class="" media="all">
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{"@context":"http:\/\/schema.org","@type":"Article","url":"https:\/\/skillbox.ru\/media\/code\/izuchaem_c_chast_6_tsikly_while_do_while_i_for\/","headline":"\u0426\u0438\u043a\u043b\u044b for, while \u0438 do-while \u0432 \u0421++ \u0434\u043b\u044f \u043d\u043e\u0432\u0438\u0447\u043a\u043e\u0432: 6-\u044f \u0447\u0430\u0441\u0442\u044c \u0433\u0430\u0439\u0434\u0430 \u043f\u043e \u044f\u0437\u044b\u043a\u0443 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f","articleSection":"\u041a\u043e\u0434","articleBody":"\u042d\u0442\u043e \u0448\u0435\u0441\u0442\u0430\u044f \u0447\u0430\u0441\u0442\u044c \u0438\u0437 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u00ab\u0413\u043b\u0443\u0431\u043e\u043a\u043e\u0435 \r\n\u043f\u043e\u0433\u0440\u0443\u0436\u0435\u043d\u0438\u0435 \u0432 C++\u00bb. \u0412 \u043f\u0440\u043e\u0448\u043b\u044b\u0439 \u0440\u0430\u0437 \u043c\u044b \u0443\u0437\u043d\u0430\u043b\u0438, \u043a\u0430\u043a \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0438 \u043f\u0440\u043e\u0446\u0435\u0434\u0443\u0440\u044b. \u0421\u0435\u0439\u0447\u0430\u0441 \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u043c \u043e \u0446\u0438\u043a\u043b\u0430\u0445 while, do-while \u0438 for.\r\n\r\n\u0426\u0438\u043a\u043b\u044b \u2014 \u044d\u0442\u043e \u0440\u0430\u0437\u043d\u043e\u0432\u0438\u0434\u043d\u043e\u0441\u0442\u044c \u0443\u0441\u043b\u043e\u0432\u043d\u044b\u0445 \r\n\u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439. \u041e\u043d\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0440\u0430\u0437, \u0435\u0441\u043b\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0435 \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u0435 \u0432\u0435\u0440\u043d\u043e. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0446\u0438\u043a\u043b\u043e\u0432 \u043c\u043e\u0436\u043d\u043e \u043f\u044f\u0442\u044c \u0440\u0430\u0437 \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d \u043a\u0430\u043a\u0443\u044e-\u043d\u0438\u0431\u0443\u0434\u044c \u043d\u0430\u0434\u043f\u0438\u0441\u044c \u0438\u043b\u0438 \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u0441\u0443\u043c\u043c\u0443 \u0432\u0441\u0435\u0445 \u0447\u0438\u0441\u0435\u043b.\r\n\r\n\u0426\u0438\u043a\u043b while \u0432 C++\r\n\r\n\u0417\u0430\u043f\u0438\u0441\u044c \u0446\u0438\u043a\u043b\u0430 while \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\u042d\u0442\u043e\u0442 \u043a\u043e\u0434 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:\r\n\r\n- \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442, \u0432\u0435\u0440\u043d\u043e \u043b\u0438 \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u0435.\r\n- \u0412\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0442\u0441\u044f \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 \u0432 \u0442\u0435\u043b\u0435 \u0446\u0438\u043a\u043b\u0430.\r\n- \u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442\u0441\u044f \u043a \u043f\u0443\u043d\u043a\u0442\u0443 1.\r\n\r\n\u0422\u043e \u0435\u0441\u0442\u044c \u043f\u043e\u043a\u0430 \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u0435 \u0432\u0435\u0440\u043d\u043e (i < \r\n100), \u0446\u0438\u043a\u043b \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u0442\u044c \u043e\u0434\u043d\u0438 \u0438 \u0442\u0435 \u0436\u0435 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f. \u0426\u0438\u043a\u043b, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u044f\u0442\u044c \u0440\u0430\u0437 \u0432\u044b\u0432\u043e\u0434\u0438\u0442 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u00abHello, World!\u00bb:\r\n\r\n\r\n\r\n\r\n\r\n\r\nint i = 0; while(i < 5) { std::cout << \"Hello, World! \\n\"; i++; \r\n} \r\n\r\n\u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u0432\u044b\u0432\u043e\u0434:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0443\u044e i \u2014 \r\n\u043e\u043d\u0430 \u0438\u0433\u0440\u0430\u0435\u0442 \u0440\u043e\u043b\u044c \u0441\u0447\u0451\u0442\u0447\u0438\u043a\u0430, \u043a \u043a\u043e\u0442\u043e\u0440\u043e\u043c\u0443 \u0432 \u043a\u0430\u0436\u0434\u043e\u043c \u0448\u0430\u0433\u0435 \u0446\u0438\u043a\u043b\u0430 \u043f\u0440\u0438\u0431\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0435\u0434\u0438\u043d\u0438\u0446\u0430. \u042d\u0442\u043e \u043d\u0443\u0436\u043d\u043e, \u0447\u0442\u043e\u0431\u044b \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u043b\u0438\u0441\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0440\u0430\u0437.\r\n\r\n\u041e\u0434\u0438\u043d \u0448\u0430\u0433 \u0446\u0438\u043a\u043b\u0430 \u043d\u0430\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u0435\u0439, \u0430 \u0441\u0447\u0451\u0442\u0447\u0438\u043a \u2014 \r\n\u0438\u0442\u0435\u0440\u0430\u0442\u043e\u0440\u043e\u043c. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0447\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e \u0434\u043b\u044f \u0441\u0447\u0451\u0442\u0447\u0438\u043a\u0430 \u0441\u043e\u0437\u0434\u0430\u0451\u0442\u0441\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f i.\r\n\r\n\r\n\r\n\u0412\u0430\u0436\u043d\u043e! \u0421\u043b\u0435\u0434\u0438\u0442\u0435 \u0437\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e\u0431\u044b \u0432\u044b\u0445\u043e\u0434 \u0438\u0437 \u0446\u0438\u043a\u043b\u0430 \r\n\u0431\u044b\u043b \u0432\u043e\u0437\u043c\u043e\u0436\u0435\u043d, \u0438\u043d\u0430\u0447\u0435 \u043e\u043d \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c\u0441\u044f \u0431\u0435\u0441\u043a\u043e\u043d\u0435\u0447\u043d\u043e.\r\n\r\n\u0415\u0441\u043b\u0438 \u0432\u043d\u0443\u0442\u0440\u0438 \u0446\u0438\u043a\u043b\u0430 \u0441\u043a\u043b\u0430\u0434\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u0447\u0438\u0441\u043b\u0430 \u0438\u043b\u0438 \r\n\u0447\u0442\u043e-\u0442\u043e \u0432\u044b\u0432\u043e\u0434\u0438\u0442\u0441\u044f, \u0442\u043e \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0430 \u0431\u0443\u0434\u0435\u0442 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0439. \u0415\u0441\u043b\u0438 \u0436\u0435 \u044d\u0442\u043e \u043a\u0430\u043a\u0438\u0435-\u0442\u043e \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0437\u0430\u0442\u0440\u0430\u0442\u043d\u044b\u0435 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f, \u0442\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0442\u0430\u043a\u043e\u0433\u043e \u0446\u0438\u043a\u043b\u0430 \u043c\u043e\u0436\u0435\u0442 \u0437\u0430\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440 \u0437\u0430\u0432\u0438\u0441\u043d\u0443\u0442\u044c.\r\n\r\n\u041a\u043e\u0433\u0434\u0430 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0432\u043c\u0435\u0448\u0430\u0442\u044c\u0441\u044f \u0432 \u0440\u0430\u0431\u043e\u0442\u0443 \u0446\u0438\u043a\u043b\u0430, \r\n\u043c\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b break \u0438 continue.\r\n\r\n\u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 break\r\n\r\n\u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 break \u043f\u0440\u0435\u0440\u044b\u0432\u0430\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0446\u0438\u043a\u043b\u0430:\r\n\r\n\r\n\r\n\r\n\r\n\r\nint sum = 0; int maxSum = 50; int i = 0; while(i < 100) { sum += i; \r\ni++; if(sum >= maxSum) { break; } } std::cout << \"i = \" << i << \"\\nsum = \" << sum << \"\\n\"; \r\n\r\n\u042d\u0442\u043e\u0442 \u0446\u0438\u043a\u043b \u0434\u043e\u043b\u0436\u0435\u043d \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u0441\u0443\u043c\u043c\u0443 \u0432\u0441\u0435\u0445 \u0447\u0438\u0441\u0435\u043b \r\n\u043e\u0442 \u043e\u0434\u043d\u043e\u0433\u043e \u0434\u043e \u0441\u0442\u0430. \u041d\u043e \u043c\u044b \u0443\u043a\u0430\u0437\u0430\u043b\u0438 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 sum, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0446\u0438\u043a\u043b \u043f\u0440\u0435\u0440\u0432\u0451\u0442\u0441\u044f, \u043a\u0430\u043a \u0442\u043e\u043b\u044c\u043a\u043e sum \u0441\u0442\u0430\u043d\u0435\u0442 \u0431\u043e\u043b\u044c\u0448\u0435 maxSum.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\u041a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u0443\u043c\u0435\u0435\u0442 \u043e\u0442\u043b\u0438\u0447\u0430\u0442\u044c \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 break \r\n\u0432 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 switch \u043e\u0442 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0430 break, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u0435\u0440\u044b\u0432\u0430\u0435\u0442 \u0446\u0438\u043a\u043b\u044b. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u043c\u043e\u0436\u043d\u043e \u0441\u043f\u043e\u043a\u043e\u0439\u043d\u043e \u043f\u0438\u0441\u0430\u0442\u044c \u0432\u043e\u0442 \u0442\u0430\u043a\u043e\u0439 \u043a\u043e\u0434:\r\n\r\n\r\n\r\n\r\n\r\n\r\nint action = 0; bool end = false; \/\/\u042d\u0442\u043e\u0442 \u0446\u0438\u043a\u043b \u0431\u0443\u0434\u0435\u0442 \u0431\u0435\u0441\u043a\u043e\u043d\u0435\u0447\u043d\u044b\u043c, \r\n\u0435\u0441\u043b\u0438 \u0435\u0433\u043e \u043d\u0435 \u043f\u0440\u0435\u0440\u0432\u0430\u0442\u044c \u0438\u0437\u043d\u0443\u0442\u0440\u0438 while(true) { std::cout << \"Exit? \\n1 - Yes\\n0 - No\\nAction: \"; std::cin >> action; switch(action) { case 1: std::cout << \"Good bye!\\n\"; end = true; break; case 0: std::cout << \"Try again!\\n\"; } if(end) { break; } } \r\n\r\n\u0412\u043e\u0442 \u043a\u0430\u043a \u044d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\r\n\r\n\u0412\u0430\u0436\u043d\u043e! \u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 break \u0432\u043d\u0443\u0442\u0440\u0438 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 \r\nswitch \u043d\u0435 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0435\u0440\u0432\u0430\u0442\u044c \u0446\u0438\u043a\u043b.\r\n\r\n\u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 continue\r\n\r\n\u0418\u043d\u043e\u0433\u0434\u0430 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u043f\u0440\u043e\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u043e\u0434\u043d\u0443 \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u044e \r\n\u0438 \u043f\u0435\u0440\u0435\u0439\u0442\u0438 \u043a \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439. \u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 continue.\r\n\r\n\r\n\r\n\r\n\r\n\r\nint i = 0; while(i < 100) { i++; \/\/ if(i % 3 == 0) { continue; } std::cout \r\n<< \" \" << i; } std::cout << \"\\n\"; \r\n\r\n\u042d\u0442\u043e\u0442 \u0446\u0438\u043a\u043b \u0432\u044b\u0432\u0435\u0434\u0435\u0442 \u0432\u0441\u0435 \u0447\u0438\u0441\u043b\u0430 \u043e\u0442 \u043e\u0434\u043d\u043e\u0433\u043e \r\n\u0434\u043e \u0441\u0442\u0430, \u043a\u0440\u043e\u043c\u0435 \u0442\u0435\u0445, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0434\u0435\u043b\u044f\u0442\u0441\u044f \u043d\u0430 \u0442\u0440\u0438 \u0431\u0435\u0437 \u043e\u0441\u0442\u0430\u0442\u043a\u0430.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\u0426\u0438\u043a\u043b do-while \u0432 C++\r\n\r\n\u0426\u0438\u043a\u043b do-while \u043f\u043e\u0445\u043e\u0436 \u043d\u0430 while, \u043d\u043e \u043e\u043d \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \r\n\u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u043e\u0434\u043d\u0443 \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u044e \u0438 \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0442\u043e\u043c \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442 \u0432\u0435\u0440\u043d\u043e\u0441\u0442\u044c \u0443\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0438\u044f:\r\n\r\n\r\n\r\n\r\n\r\n\r\nwhile(false) { \/\/\u041d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u0432\u044b\u0432\u043e\u0434\u0438\u0442\u0441\u044f std::cout << \r\n\"Hello! \\n\"; } do { \/\/\u041d\u0430\u0434\u043f\u0438\u0441\u044c \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0432\u0435\u0434\u0435\u043d\u0430 \u043e\u0434\u0438\u043d \u0440\u0430\u0437 std::cout << \"Bye! \\n\"; } while(false); \r\n\r\n\u0412\u043e\u0442 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\u0426\u0438\u043a\u043b for \u0432 C++\r\n\r\n\u0415\u0441\u043b\u0438 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0446\u0438\u043a\u043b\u0430 \u043d\u0443\u0436\u0435\u043d \u0441\u0447\u0451\u0442\u0447\u0438\u043a, \u0442\u043e \u0435\u0433\u043e \r\n\u0437\u0430\u043f\u0438\u0441\u044c \u043c\u043e\u0436\u043d\u043e \u0441\u043e\u043a\u0440\u0430\u0442\u0438\u0442\u044c \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0446\u0438\u043a\u043b\u0430 for, \u0437\u0430\u043f\u0438\u0441\u0430\u0432 \u043b\u043e\u0433\u0438\u043a\u0443 \u0432 \u0441\u043a\u043e\u0431\u043a\u0438:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\u0412\u043e\u0442 \u043f\u0440\u0438\u043c\u0435\u0440 \u0442\u0430\u043a\u043e\u0433\u043e \u0446\u0438\u043a\u043b\u0430:\r\n\r\n\r\n\r\n\r\n\r\n\r\nint sum = 0; for(int i = 0; i < 200; i++) { sum += i; } std::cout << \r\n\"sum = \" << sum << \"\\n\"; \r\n\r\n\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0441\u0443\u043c\u043c\u0443 \u0432\u0441\u0435\u0445 \r\n\u0447\u0438\u0441\u0435\u043b \u043e\u0442 1 \u0434\u043e 200:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\u0412\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0435 \u0446\u0438\u043a\u043b\u044b\r\n\r\n\u0426\u0438\u043a\u043b\u044b, \u043a\u0430\u043a \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438, \u043c\u043e\u0436\u043d\u043e \r\n\u0440\u0430\u0437\u043c\u0435\u0449\u0430\u0442\u044c \u0432\u043d\u0443\u0442\u0440\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u0446\u0438\u043a\u043b\u043e\u0432. \u0412\u043e\u0442, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043a\u0430\u043a \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0441\u0435\u0442\u043a\u0443 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e for:\r\n\r\n\r\n\r\n\r\n\r\n\r\nfor(int i = 0; i < 10; i++) { \/\/\u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435, \u0447\u0442\u043e \r\n\u0432\u043e \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u043e\u043c \u0446\u0438\u043a\u043b\u0435 \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u0440\u0443\u0433\u043e\u0439 \u0438\u0442\u0435\u0440\u0430\u0442\u043e\u0440. \u0412 \u0434\u0430\u043d\u043d\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 j \u0432\u043c\u0435\u0441\u0442\u043e i for(int j = 0; j < 10; j++) { std::cout << \" + \"; } std::cout << \"\\n\"; } \r\n\r\n\u041f\u043e\u043b\u0443\u0447\u0430\u0435\u043c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n \r\n\r\n\r\n\r\n\u0412\u0430\u0436\u043d\u043e! \u041e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u044b break \u0438 continue \u0432\u043b\u0438\u044f\u044e\u0442 \u043d\u0430 \u0442\u043e\u0442 \r\n\u0446\u0438\u043a\u043b, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u043e\u043d\u0438 \u043d\u0430\u0445\u043e\u0434\u044f\u0442\u0441\u044f, \u0430 \u043d\u0435 \u043d\u0430 \u0440\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u0439.\r\n\r\n\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\r\n\r\n\u0426\u0438\u043a\u043b\u044b \u2014 \u043e\u0434\u043d\u0438 \u0438\u0437 \u0441\u0430\u043c\u044b\u0445 \u0447\u0430\u0441\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \r\n\u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439 \u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438. \u041e\u043d\u0438 \u043d\u0443\u0436\u043d\u044b \u043f\u0440\u0438 \u0447\u0442\u0435\u043d\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u0444\u0430\u0439\u043b\u043e\u0432, \u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u043a\u0435, \u043e\u0442\u0440\u0438\u0441\u043e\u0432\u043a\u0435 \u0433\u0440\u0430\u0444\u0438\u043a\u0438 \u0438 \u0442\u0430\u043a \u0434\u0430\u043b\u0435\u0435. \u041e\u0434\u043d\u043e \u0438\u0437 \u0441\u0430\u043c\u044b\u0445 \u043f\u043e\u043b\u0435\u0437\u043d\u044b\u0445 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0446\u0438\u043a\u043b\u043e\u0432 \u0441\u0432\u044f\u0437\u0430\u043d\u043e \u0441 \u043c\u0430\u0441\u0441\u0438\u0432\u0430\u043c\u0438, \u043e \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 \u043a\u043e\u0442\u043e\u0440\u044b\u043c\u0438 \u0431\u0443\u0434\u0435\u0442 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u0430\u044f \u0441\u0442\u0430\u0442\u044c\u044f.\r\n\r\n\r\n\r\n\u0427\u0438\u0442\u0430\u0439\u0442\u0435 \u0442\u0430\u043a\u0436\u0435:\r\n\r\n- \u041e\u041e\u041f \u0443\u043c\u0435\u0440\u043b\u043e? \u0414\u0430 \u0437\u0434\u0440\u0430\u0432\u0441\u0442\u0432\u0443\u0435\u0442 \u041e\u041e\u041f! \r\n \r\n- \u0427\u0443\u0436\u043e\u0439 \u043a\u043e\u0434: \u043a\u0440\u0430\u0442\u043a\u0438\u0439 \u043b\u0438\u043a\u0431\u0435\u0437 \u043f\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044e \r\n \r\n- \u042f\u0437\u044b\u043a \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f R: \u043d\u0438\u0447\u0435\u0433\u043e \u043b\u0438\u0448\u043d\u0435\u0433\u043e, \r\n\u0442\u043e\u043b\u044c\u043a\u043e \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 ","author":{"@type":"Person","name":"\u0415\u0432\u0433\u0435\u043d\u0438\u0439 \u041a\u0443\u0447\u0435\u0440\u044f\u0432\u044b\u0439","url":"https:\/\/skillbox.ru\/media\/authors\/evgenij-kucheryavyj\/"},"publisher":{"@type":"Organization","name":"Skillbox","logo":{"@type":"ImageObject","url":"https:\/\/skillbox.ru\/static\/images\/skillbox.png"}},"mainEntityOfPage":{"@type":"WebPage","url":"https:\/\/skillbox.ru\/media\/code\/izuchaem_c_chast_6_tsikly_while_do_while_i_for\/"},"datePublished":"2020-06-08T12:00:00Z","dateModified":"2025-03-07T06:48:38Z","image":{"@type":"ImageObject","url":["https:\/\/248006.selcdn.ru\/main\/iblock\/2f4\/2f40ef778401a5b3b82561a045b33789\/fd7d2728db490e69b587450f4061f13d.png"]},"description":"\u0420\u0430\u0437\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f, \u043a\u0430\u043a \u0441\u043e\u043a\u0440\u0430\u0442\u0438\u0442\u044c \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u044e\u0449\u0438\u0439\u0441\u044f \u043a\u043e\u0434 \u0432 C++ \u0438 \u0441\u044d\u043a\u043e\u043d\u043e\u043c\u0438\u0442\u044c \u0432\u0440\u0435\u043c\u044f."}
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