C++返回引用的函数例程

//函数返回值为引用
#include <iostream.h>

int a[]={1,3,5,7,9};
int &index(int); //声明返回引用的函数

void main()
{
cout<<index(2)<<endl;
index(2)=25;
//a[2] = 25;
cout<<index(2)<<endl;
}

//引用就是变量的别名,这里是返回一个别名,一个变量的别名
int &index(int i)
{
return a[i];
}

//引用举例
#include <iostream>
using namespace std;

int &max(int &num1,int &num2);
int &min(int &num1,int &num2);

void main()
{
int n1,n2;
cout<<"Enter two numbers:";
cin>>n1>>n2;
max(n1,n2) = 0;
cout<<"\nAftrer putting zero in largest,then numbers are:"
<<n1<<" and "<<n2<<endl;
cout<<"Enter two numbers:";
cin>>n1>>n2;
min(n1,n2)=0;
cout<<"\nAftrer putting zero in smallest,then numbers are:"
<<n1<<" and "<<n2<<endl;
}

int &max(int &num1,int &num2)
{
return (num1>num2?num1:num2);

}

int &min(int &num1,int &num2)
{
return (num1<num2?num1:num2);
}