C语言预定义的宏

// --------------------------------------
#include <stdio.h>

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__ );

}