//Author:xtyang //记得大一学C语言,永远都不明白如何调用一个函数,真是好可爱呀。 #include<iostream> using namespace std; //定义函数原型 int add(int m,int n); int minus(int m,int n); //Main,程序入口 int main() { int r,p,res,opt; cout<<"Please input the opt to run responding command.\n" <<"1.Add Function.\n" <<"2.Minus Function" <<endl; cin>>opt; cout<<"Please input the two num to be calc."<<endl; cin>>r>>p; switch(opt) { case 1: res = add(r,p); break; case 2: res = minus(r,p); break; default: res = 0; break; } cout<<"The result is:"<<res<<endl; } int add(int m,int n) { int res = m+n; return (res); } int minus(int m,int n) { return (m-n); }