第八周实验报告（一）《方案二》用类的友元函数

/*

实验目的：1.学会定义类中双目和单目运算符的重载函数

          2.学会使用类的成员函数和友元函数实现运算符的重载

* 程序的版权和版本声明部分

* Copyright (c) 2011, 烟台大学计算机学院学生

* All rights reserved.

* 文件名称：方案一 用类的重载运算符 +、-、*、/，使之能用于复数的加减乘除                             

* 作    者：  晁 阳                           

* 完成日期：  2012年 4 月 7 日

* 版 本 号： t.10        

* 对任务及求解方法的描述部分

* 代码实现

#include <iostream>

using namespace std;

class Complex
{
public:
Complex(){real=0;imag=0;}
Complex(double r,double i){real=r;imag=i;}
friend Complex operator+(Complex &c1,Complex &c2);//声明重载运算符“+”的友元函数
friend Complex operator-(Complex &c1,Complex &c2);//声明重载运算符“-”的友元函数
friend Complex operator*(Complex &c1,Complex &c2);//声明重载运算符“*”的友元函数
friend Complex operator/(Complex &c1,Complex &c2);//声明重载运算符“/”的友元函数
void display();
private:
double real;
double imag;
};
//下面定义成员函数

Complex operator+(Complex &c1,Complex &c2)//定义重载运算符“+”的友元函数
{
Complex c;
c.real = c1.real + c2.real;
c.imag = c1.imag + c2.imag;
return c;
}

Complex operator-(Complex &c1,Complex &c2)//定义重载运算符“-”的友元函数
{
Complex c;
c.real = c1.real - c2.real;
c.imag = c1.imag - c2.imag;
return c;
}

Complex operator*(Complex &c1,Complex &c2)//定义重载运算符“*”的友元函数
{
Complex c;
c.real = c1.real * c2.real;
c.imag = c1.imag * c2.imag;
return c;
}

Complex operator/(Complex &c1,Complex &c2)//定义重载运算符“/”的友元函数
{
Complex c;
c.real = c1.real / c2.real;
c.imag = c1.imag / c2.imag;
return c;
}

void Complex::display()
{
cout << "(" <<real<<","<<imag<<"i)"<<endl;
}

int main()
{
Complex c1(3,4),c2(5,-10),c3;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
c3=c1+c2;
cout<<"c1+c2=";
c3.display();
c3=c1-c2;
cout<<"c1-c2=";
c3.display();
c3=c1*c2;
cout<<"c1*c2=";
c3.display();
c3=c1/c2;
cout<<"c1/c2=";
c3.display();
system("pause");
return 0;
}