[置顶] 第九周项目1

/*             
* 程序的版权和版本声明部分             
* Copyright (c)2013, 烟台大学计算机学院学生             
* All rightsreserved.             
* 文件名称： object.cpp             
* 作者：杨绍宁            
* 完成日期： 2013年  4  月 26日             
* 版本号： v1.0             
* 输入描述：无             
* 问题描述：            
* 程序输出：略。             
*/       
#include<iostream>
using namespace std;
class Complex
{
public:
	Complex(){real=0;imag=0;}
	Complex(double r,double i){real=r;imag=i;}
	Complex operator+(Complex &c2);
	Complex operator*(Complex &c2);
	Complex operator/(Complex &c2);
	friend 	Complex operator-(Complex &c1,Complex &c2);
	friend istream& operator>>(istream&,Complex&);
	friend ostream& operator<<(ostream&,Complex&);
	void display();
private:
	double real;
	double imag;
};
istream& operator>>(istream& input,Complex&c)
{
    input>>c.real>>c.imag;
    return input;
}
ostream& operator<<(ostream&output,Complex&c)
{
  output<<"("<<c.real<<","<<c.imag<<"i)";
}
Complex Complex::operator+(Complex &c2)
{
	Complex c;
	c.real=real+c2.real;
	c.imag=imag+c2.imag;
	return c;
}

Complex Complex::operator*(Complex &c2)
{
	Complex c;
	c.real=real*c2.real-imag*c2.imag;
    c.imag=imag*c2.real+real*c2.imag;
    return c;

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

	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,c2,c3;
	cin>>c1>>c2;
	cout<<"c1=";
	cout<<c1<<endl;
	cout<<"c2=";
	cout<<c2<<endl;
	c3=c1+c2;
	cout<<"c1+c2=";
	cout<<c3<<endl;
	c3=c1-c2;
	cout<<"c1-c2=";
	cout<<c3<<endl;
	c3=c1*c2;
	cout<<"c1*c2=";
	cout<<c3<<endl;
	c3=c1/c2;
	cout<<"c1/c2=";
	cout<<c3<<endl;
	return 0;
}

感受：重载流提取运算符>>,使问题简单啊