结构体运算符重载

1、定义结构体

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struct Currency

{

int Dollar;

int Cents;

}

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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friend ostream &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;

return out;

}

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>

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;

}

The end...