仅供参考,这个是转载的,对于一些重载,比如说重载=操作符,对原作者结构认同,但是对于原作者的重载方法不认同,所以已经修改,这个如果希望看到原版,请参考本文最后的原文链接
1、定义结构体
<span style="font-size:14px;">struct Currency
{
int Dollar;
int Cents;
char *name;
}
</span>
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
<span style="font-size:14px;">friend ostream &operator<<(ostream &out,Currency value);</span>
在结构体外部进行具体定义
<span style="font-size:14px;">ostream& operator<<(ostream &out,Currency value)
{
out<<"The dollar = "<<value.Dollar<<" and The Cents = "<<value.Cents<<endl;
return out;
}</span>
3、重载结构体的“=”操作符(在结构体内部)
<span style="font-size:14px;">Currency&operator=(struct Currency &b)
{
if (this!=&b)
{
delete name;
name=(char *)malloc(10);
strcpy(name,b.name);
}
return *this;
}
</span>
4、重载结构体的“+”操作符(在结构体内部)
<span style="font-size:14px;">Currency& operator+(Currency& value)
{
Dollar += value.Dollar;
Cents += value.Cents;
return *this;
}
</span>
5、重载结构体的"-"操作符(在结构体内部)
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)
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
template <typename T>
void DisplayValue(T value)
{
cout<<value<<endl;
}
8、进行运行测试。。。
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。。。
#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;
}
最后在原文的基础上,加上一个重载运算符的例子
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct stu
{
char *name, gender;
int score;
/*重载赋值运算符开始*/
stu&operator=(struct stu &b)
{
if (this!=&b)
{
delete name;
name=(char *)malloc(10);
strcpy(name,b.name);
}
return *this;
}
/*重载赋值运算符结束*/
};
int main()
{
struct stu a = {NULL, 'm', 290}, b;
a.name = (char *)malloc(10);
strcpy(a.name, "zhao");
b = a;
b.gender = 'f';
b.score = 350;
strcpy(b.name, "qian");
printf("%s, %c, %d\n", a.name, a.gender, a.score);
printf("%s, %c, %d\n", b.name, b.gender, b.score);
}
原文地址:
作者:imFolish
出处:http://xielechuan.cnblogs.com/