结构体运算符重载

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1、定义结构体

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structCurrency  
{ 
    intDollar; 
    intCents; 
}

2、重载IO输出操作，在结构体内部将输入操作的重载定义为友元函数重载

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friendostream &operator<<(ostream &out,Currency value);

在结构体外部进行具体定义

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ostream& operator<<(ostream &out,Currency value)
{ 
    out<<"The dollar = "<<value.Dollar<<" and The Cents = "<<value.Cents<<endl;
    returnout; 
}

3、重载结构体的“=”操作符（在结构体内部）

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Currency& operator=(Currency& value)
    {
        Dollar = value.Dollar;
        Cents = value.Cents;
        return*this;
    }

4、重载结构体的“+”操作符（在结构体内部）

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Currency& operator+(Currency& value)
    {
        Dollar += value.Dollar;
        Cents += value.Cents;
        return*this;
    }

5、重载结构体的"-"操作符（在结构体内部）

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Currency &operator-(Currency& value)
    {
        Dollar = Dollar - value.Dollar;
        Cents = Cents - value.Cents;
        return*this;
    }

6、重载结构体的“*”操作符（在结构体内部）

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Currency& operator*(Currency& value)
    {
        Dollar *= value.Dollar;
        Cents *= value.Cents;
        return*this;
    }

7、定义函数模板格式的输出函数

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template<typename T> 
void DisplayValue(T value) 
{ 
    cout<<value<<endl;
}

8、进行运行测试。。。

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Currency c1; 
c1.Dollar = 10; 
c1.Cents = 5; 
DisplayValue(c1); 
Currency c2,c3; 
c2 = c1; 
c3= c1+c2; 
DisplayValue(c3);

附上完整程序代码。。。

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#include "stdafx.h"
#include <iostream>
usingnamespace std; 
  
template<typename T> 
void DisplayValue(T value) 
{ 
    cout<<value<<endl;
} 
  
structCurrency  
{ 
    intDollar; 
    intCents; 
      
    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;
    }
    friendostream &operator<<(ostream &out,Currency value); 
}; 
  
ostream& operator<<(ostream &out,Currency value)
{ 
    out<<"The dollar = "<<value.Dollar<<" and The Cents = "<<value.Cents<<endl;
    returnout; 
} 
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");
    return0; 
}

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