#include <stdio.h>
void butler(void);//函数原型声明没错，关键是这个函数没加“；”，这是常识！
int main(void)
{
   printf("I will summon the butler function.\n");
   butler();
   printf("Yes,Bring me some tea and writeable CD-ROMS\n");
   return 0;

}

void butler(void)
{
   printf("You rang,sir?\n"); 

}