#include"stdio.h" void a(); void b(); void c(); void d(); void e(); int main() { int n; printf("please input the num:\n"); scanf("%d",&n); switch(n) { case 0:break; case 1:a();break; case 2:b();break; case 3:c();break; case 4:d();break; case 5:e();break; } return 0; }