#if 0 ..... #endif块到底是做什么的？ [英] What exactly does an #if 0 ..... #endif block do?

问题描述

在 C / C ++

放置在 #if 0 / #endif 块？

#if 0

//Code goes here

#endif

有

推荐答案

不仅不执行它，甚至不执行它？

Not only does it not get executed, it doesn't even get compiled.

#if 是预处理程序命令，该命令在实际编译步骤之前进行评估。

#if is a preprocessor command, which gets evaluated before the actual compilation step. The code inside that block doesn't appear in the compiled binary.

它通常用于临时删除代码段，以便稍后重新打开。

It's often used for temporarily removing segments of code with the intention of turning them back on later.

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