操作符重载

操作符重载

 

#include <iostream>

#include <string>

using namespace std;

 

//定义水果类

 class Fruit

{

  string name;

  string colour;

public:

         friend istream& operator>>(istream&,Fruit&);                    // 输入流

         friend ostream& operator<<(ostream& out,const Fruit& fruit);       // 输出流

         void print()

         {

                   cout<<colour<<" "<<name<<endl;

         }

 

         Fruit(const string nst="apple",const string cst="green"):name(nst),colour(cst)

         {

         }

 

         ~Fruit()

         {

         }

};

 

 

//重载操作符

ostream& operator<<(ostream& out, const Fruit &s)

{

         out<<s.colour<<" "<<s.name<<endl;

         return out;

 

}

 

istream& operator>>(istream& in,Fruit &s)

{

         in>>s.colour>>s.name;

         if (!in)

         {

                   cerr<<"Wrong input!"<<endl;

         }

         return in;

}

 

 

 

主程序：

         Fruit apple;

         cin>>apple;

         cout<<apple;