2018-10-16 21:32:40 +05:30

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---
title:While-loop
localeTitle: undefined
---
只要给定条件为真while循环语句就会重复执行目标语句。
句法: whilecondition{ 声明S; }
while循环的一个关键点是循环可能永远不会运行。 当测试条件并且结果为假时将跳过循环体并且将执行while循环之后的第一个语句。
例:
```C++
#include <iostream>
using namespace std;
int main () {
// Local variable declaration:
int a = 10;
// while loop execution
while( a < 20 ) {
cout << "value of a: " << a << endl;
a++;
}
return 0;
}
```
输出:
价值10 价值11 价值12 价值a13 a的值14 价值a15 价值16 价值17 价值18 价值19
### 来源
www.tutorialspoint.com