第八周项目一（3）

/*
* 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 rights reserved.
* 文件名称：Complex.cpp
* 作    者：李巧丽
* 完成日期：2013  年  4 月  20 日
* 版 本 号： V 1.0
* 输入描述： 实现复数类中的运算符重载
* 问题描述：定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。
* 程序输出： +、-、*、/，对复数运算后的结果。
*/
#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);
	friend Complex operator+ (Complex &c1, const double &d);
	friend Complex operator- (Complex &c1, const double &d);
	friend Complex operator* (Complex &c1, const double &d);
	friend Complex operator/ (Complex &c1, const double &d);
	friend Complex operator+ (const double &d,Complex &c1);
	friend Complex operator- (const double &d,Complex &c1);
	friend Complex operator* (const double &d,Complex &c1);
	friend Complex operator/ (const double &d,Complex &c1);
	friend Complex operator- (Complex &c1);
	void display();
private:
	double real;
	double imag;
};
void Complex::display()
{
	cout << "(" << real << "," << imag << "i)" << endl;
}
//下面定义友元函数
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)
{
	Complex c;

	c.real = c1.real*c2.real - c1.imag*c2.imag;
	c.imag = c1.real*c2.imag + c1.imag*c2.real;

	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.real*c2.imag + c1.imag*c2.real)/(c2.real*c2.real + c2.imag*c2.imag);

	return c;
}

Complex operator+ (Complex &c1, const double &d)
{
	Complex c;
	c.real = c1.real+d;
	c.imag = c1.imag;
	return c;

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

}
Complex operator- ( const double &d, Complex &c1)
{
	Complex c;
	c.real = d - c1.real;
	c.imag = - c1.imag;
	return c;

}
Complex operator* (Complex &c1, const double &d)
{
	Complex c;

	c.real = c1.real*d;
	c.imag = c1.imag*d;

	return c;
}
Complex operator* ( const double &d, Complex &c1)
{
	Complex c;

	c.real = d*c1.real;
	c.imag = d*c1.imag;

	return c;
}
Complex operator/ (Complex &c1, const double &d)
{
	Complex c;

	c.real = c1.real/d;
	c.imag = c1.imag/d;

	return c;
}
Complex operator/ ( const double &d, Complex &c1)
{
	Complex c;

	c.real = d/c1.real;
	c.imag = d/c1.imag;

	return c;
}
Complex operator- (Complex &c1)
{
	Complex c;
	c.real = -c1.real;
	c.imag = -c1.imag;

	return c;
}



int main()
{
	Complex c1(3, 4), c2(5, -10), c3;
	int s=2;
	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();

	c3= c1 + s;
	cout<<"c1 + s=";
	c3.display();

	c3= c1 - s;
	cout<<"c1 - s=";
	c3.display();

	c3= c1 * s;

	cout<<"c1 * s=";
	c3.display();

	c3= c1 / s;
	cout<<"c1 / s=";
	c3.display();

	c3= s + c1;
	cout<<" s+c1 =";
	c3.display();

	c3= s - c1 ;
	cout<<" s-c1 =";
	c3.display();

	c3 = s * c1 ;

	cout<<" s*c1 =";
	c3.display();

	c3 = s /c1  ;
	cout<<" s/c1 =";
	c3.display();

	c3= -c1;
	cout<<"-c1=";
	c3.display();

	return 0;
}

运行结果: