学步园

/* (程序头部注释开始)   
* 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：复数类改                               
* 作    者：张旭                                 
* 完成日期：  2012   年   4   月    18  日   
* 版 本 号：略              
* 对任务及求解方法的描述部分   
* 输入描述：略    
* 问题描述：略    
* 程序输出：略    
* 程序头部的注释结束   
*/  
#include <iostream>
#include <cmath>

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); 

  friend istream &operator>>(istream &input, Complex &d);

  friend ostream &operator<<(ostream &output, Complex &d);

  void display(); 

 private: 

  double real; 

  double imag; 
}; 

//下面定义成员函数

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;
}

//下面定义改
istream &operator>>(istream &input, Complex &d)  
{
	char c;

    input >> d.real;

	cin >> c;

	input >> d.imag;

	if (c == '-')
	{
		d.imag = -d.imag;
	}
	cin >> c;

    return input;  
}  

ostream &operator <<(ostream &output, Complex &d)  
{
	output << d.real;

	if (d.imag > 0)
	{
		cout << '+';
	}
	output << d.imag;

	cout << 'i';

    return output;  
}  

int main()
{
	Complex c1(3,4),c2(5,-10),c3;

	cin >> c3;

	cout << c1 << endl << c2 << endl << c3;

	system("pause");

	return 0;
}