Some predefined macros in the C language standard

Some predefined macros in the C language standard

The C standard specifies some predefined macros that are often used for programming.
The following table is a list of predefined macros that are often used.

__date__
Date for preprocessing (string literals in the form of "MMM DD yyyy")

__file__
string literal representing the current source code file name

__line__
An integer constant representing the line number in the current source code

__time__
Source file compile time, format similar to "Hh:mm:ss", String type

__func__
The current function name, which is also a string type, is C99 new, and VC6 is not supported.

For macros such as __file__,__line__,__func__, when you debug a program, you are
Very useful because you can easily know that the program is running to the
Which is the line of the file, which is the function.