无限while循环和for循环有什么区别？ [英] What is the difference between infinite while loops and for loops?

问题描述

我看到我读过的许多书中使用的不同约定，你可以使用以下两种循环结构创建无限循环：

I see the different conventions used in many books I had read, where you would create infinite loops with either loop structure such as:

while()
   foo();
for(;;)
   foo();

但是真的，我应该知道的区别是什么？哪一个更好？

But really, what are the differences I should know about? which one is better?

推荐答案

它们在语义上是等价的。 （x; y; z）{foo; } 等效于 x; while（y）{foo; z; } 。在 for（int x = 0; y; z）的示例中，的范围不同于标准的其他版本> x 是for块，在循环结束后超出范围，而 int x;

They're semantically the equivalent. (x;y;z) { foo; } is equivalent to x; while (y) { foo; z; }. They're not exactly equivalent in further versions of the standard, in the example of for (int x = 0; y; z), the scope of x is the for block and is out of scope after the loop ends, whereas with int x; while (y) x it's still in scope after the loop ends.

另一个区别是 for 解释缺少 y 为TRUE，而而必须提供一个表达式。 for（;;）{foo; } 很好，但 while（）{foo; } isn not。

Another difference is that for interprets missing y as TRUE, whereas while must be supplied with an expression. for (;;) { foo; } is fine, but while() { foo; } isn not.

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