C语言-函数-Predefined preprocessor variables

最新推荐文章于 2021-05-20 02:13:05 发布

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本文深入探讨了预处理器宏如__LINE__, __FILE__, __DATE__, __TIME__, __cplusplus和__STDC__的作用与使用场景。这些变量能帮助开发者了解代码的编译时间和位置，对于调试和日志记录至关重要。

Syntax:

  __LINE__
  __FILE__
  __DATE__
  __TIME__
  __cplusplus
  __STDC__

The following variables can vary by compiler, but generally work:

The __LINE__ and __FILE__ variables represent the current line and current file being processed.
The __DATE__ variable contains the current date, in the form month/day/year. This is the date that the file was compiled, not necessarily the current date.
The __TIME__ variable represents the current time, in the form hour:minute:second. This is the time that the file was compiled, not necessarily the current time.
The __cplusplus variable is only defined when compiling a C++ program. In some older compilers, this is also called c_plusplus.
The __STDC__ variable is defined when compiling a C program, and may also be defined when compiling C++.