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freeCodeCamp/guide/chinese/cplusplus/while-loop/index.md
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title, localeTitle
title localeTitle
While-loop 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:

#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