结构体重载运算符

#include "stdafx.h"
#include <iostream>
using namespace std;
 
template <typename T>
void DisplayValue(T value)
{
    cout<<value<<endl;
}
 
struct Currency 
{
    int Dollar;
    int Cents;
     
    Currency& operator=(Currency& value)
    {
        Dollar = value.Dollar;
        Cents = value.Cents;
        return *this;
    }
    Currency& operator+(Currency& value)
    {
        Dollar += value.Dollar;
        Cents += value.Cents;
        return *this;
    }
    Currency &operator-(Currency& value)
    {
        Dollar = Dollar - value.Dollar;
        Cents = Cents - value.Cents;
        return *this;
    }
    Currency& operator*(Currency& value)
    {
        Dollar *= value.Dollar;
        Cents *= value.Cents;
        return *this;
    }
    friend ostream &operator<<(ostream &out,Currency value);
};
 
ostream& operator<<(ostream &out,Currency value)
{
    out<<"The dollar = "<<value.Dollar<<" and The Cents = "<<value.Cents<<endl;
    return out;
}
int _tmain(int argc, _TCHAR* argv[])
{
 
    Currency c1;
    c1.Dollar = 10;
    c1.Cents = 5;
    DisplayValue(c1);
    Currency c2,c3;
    c2 = c1;
    c3= c1+c2;
    DisplayValue(c3);
    system("pause");
    return 0;
}