第八周上机任务项目1-2用类的友元函数完成运算符的重载

01./*      
02.* 程序的版权和版本声明部分      
03.* Copyright (c)2013, 烟台大学计算机学院学生      
04.* All rightsreserved.      
5.* 文件名称： complex.cpp                                 
06.* 作    者：赵冠哲                                  
07.* 完成日期：2013年4月19日      
08.* 版本号： v1.0            
09.* 输入描述：      
10.* 问题描述：    
11.*/

#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,c2.imag-c2.imag);
}
Complex operator*(Complex &c1,Complex &c2)
{
   Complex c;
   c.real=c1.real*c2.real-c1.imag*c2.imag;
   c.imag=c1.imag*c2.real+c1.imag*c2.imag;
   return c;
}
Complex operator/(Complex &c1,Complex &c2)
{
    Complex c;
    c.real=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
    c.imag=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.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();
	return 0;
}