atexit 函数

#include <stdio.h>#include <stdlib.h>int exitfun1(void){ printf("Here is exitfun1\n"); return 0;   }int exitfun2(void){ printf("Here is exitfun2\n"); return 0;   }int main(int argc, char *argv[]){  atexit(exitfun1);   atexit(exitfun2);  printf("this is main function\n");  //system("PAUSE");  return 0;}

执行结果为：

this is main function
Here is exitfun2
Here is exitfun1

1. 用atexit登记的函数在exit时使用，且是在main执行完后

2.最后登记函数最先执行