main 主函数执行完毕后,是否可能会再执行一段代码,给出说明
2023-07-06
答案:可以,可以用_onexit 注册一个函数,它会在main 之后执行int fn1(void), fn2(void), fn3(void), fn4 (void);
void main( void )
String str(“zhanglin”);
_onexit( fn1 );
_onexit( fn2 );
_onexit( fn3 );
_onexit( fn4 );
printf( “This is executed first. ” );
int fn1()
printf( “next. ” );
return 0;
int fn2()
printf( “executed ” );
return 0;
int fn3()
printf( “is ” );
return 0;
int fn4()
printf( “This ” );
return 0;
The _onexit function is passed the address of a function (func) to be called when the program terminates normally. Successive calls to _onexit create a register of functions that are executed in LIFO (last-in-first-out) order. The functions passed to _onexit cannot take parameters.