c - while 循环检查以逗号分隔的两个值

Question

我遇到过一些看起来像这样的代码。

while(1, N) 

其中 N 可以是 0 - 100 之间的整数。

有人能告诉我们如何使用 while 循环吗？

Answer 1

根据 C11 标准文档，第 6.5.17 章，逗号运算符，

The left operand of a comma operator is evaluated as a void expression; there is a sequence point between its evaluation and that of the right operand. Then the right operand is evaluated; the result has its type and value.

所以，本质上，

while(1, N)

与

相同

 while(N)