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__ );



}