C++重载函数及重载函数模板的使用

#include<iostream.h> int max_(int a,int b); float max_(float x,float y); int max_(int a,int b,int c); float max_(float x,float y,float z); int main(int argc,char **argv) { int d; int a,b,c,max_1,max_1_; float x,y,z,max_2,max_2_; cout<<"1 两个整数"<<endl<<"2 三个整数"<<endl<<"3 两个双精度数"<<endl<<"4 三个双精度数"<<endl; while(1) { cout<<"请选择";cin>>d; switch(d) { case 1: cout<<"please enter two numbers(int)"<<endl; cout<<"a="; cin>>a; cout<<"b="; cin>>b; max_1=max_(a,b); cout<<"the max is "<<max_1<<endl;break; case 2: cout<<"please enter three numbers(int)"<<endl; cout<<"a="; cin>>a; cout<<"b="; cin>>b; cout<<"c="; cin>>c; max_1_=max_(a,b,c); cout<<"the max is "<<max_1_<<endl;break; case 3: cout<<"please enter two numbers(float)"<<endl; cout<<"x="; cin>>x; cout<<"y="; cin>>y; max_2=max_(x,y); cout<<"the max is "<<max_2<<endl;break; case 4: cout<<"please enter three numbers(float)"<<endl; cout<<"x="; cin>>x; cout<<"y="; cin>>y; cout<<"z="; cin>>z; max_2_=max_(x,y,z); cout<<"the max is "<<max_2_<<endl;break; } } return 0; } int max_(int a,int b) { if(a>b) return a; else return b; } float max_(float x,float y) { if(x>y) return x; else return y; } int max_(int a,int b,int c) { if(a>b) {if(a>c) return a; else return c; } else { if(b>c) return b; else return c;} } float max_(float x,float y,float z) { if(x>y) {if(x>z) return x; else return z; } else { if(y>z) return y; else return z; } }