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C

Predefined macros

macro description
__DATE__ The current date, a character constant in the format "MMM DD YYYY"
__TIME__ The current time, a character constant in the format "HH:MM:SS"
__FILE__ This will contain the current filename, a string constant
__LINE__ This will contain the current line number, a decimal constant
__STDC__ Defined as 1 when the compiler compiles against the ANSI standard
ANSI C defines a number of macros that you can use, but you cannot directly modify these predefined macros

#Predefined macro example

#include <stdio.h>
int main() {
  printf("File :%s\n", __FILE__);
  printf("Date :%s\n", __DATE__);
  printf("Time :%s\n", __TIME__);
  printf("Line :%d\n", __LINE__);
  printf("ANSI :%d\n", __STDC__);
}
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