第八周任务-项目一（友元函数的运算符重载）

/*
* 程序的版权和版本声明部分
* Copyright (c)2012, 烟台大学计算机学院学生
* All rightsreserved.
* 文件名称： object.cpp
* 作者：王锴英
* 完成日期： 2013年4  月19  日
* 版本号： v1.0
* 输入描述：无
* 问题描述：友元函数运算符重载
* 程序输出：
*/
#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);
friend Complex operator-(Complex &c1,Complex &c2);
friend Complex operator*(Complex &c1,Complex &c2);
friend Complex operator/(Complex &c1,Complex &c2);
void display();
private:
	double real;
	double imag;
};
Complex operator +(Complex &c1,Complex &c2)
{
  return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
Complex operator -(Complex &c1,Complex &c2)
{
   return Complex(c1.real-c2.real,c1.imag-c2.imag);
}
Complex operator *(Complex &c1,Complex &c2)
{
   return Complex(c1.real*c2.real,c1.imag*c2.imag);
}
Complex operator /(Complex &c1,Complex &c2)
{
  return Complex(c1.real/c2.real,c1.imag/c2.imag);
}
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();
	return 0;
}