第12周项目1-实现复数类中的运算重载（2）

/*
*Copyright (c) 2016, 烟台大学计算机与控制工程学院
*All rights reserved.
*文件名称：main.cpp;
*作    者：岳成艳2016年5月22号；
*版 本 号：vc++6.0；
*
*问题描述:请用类的友元函数，定义复数类重载运算符=，-，*，/，使之能用于复数的加减乘除。
*程序输入：略；
*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;}
friend Complex operator+(const Complex &c1,const Complex &c2);
friend Complex operator-(const Complex &c1,const Complex &c2);
friend Complex operator*(const Complex &c1,const Complex &c2);
friend Complex operator/(const Complex &c1,const Complex &c2);
void display();
private:
double real;
double imag;
} ;
//下面定义成员函数
Complex operator+(const Complex &c1,const Complex &c2)
{
return Complex(c1.real+c2.real,c1.imag+c2.imag);
}
Complex operator-(const Complex &c1,const Complex &c2)
{
return Complex(c1.real-c2.real,c1.imag-c2.imag);
}
Complex operator*(const Complex &c1,const Complex &c2)
{
return Complex(c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c1.imag*c2.real);
}
Complex operator/(const Complex &c1,const Complex &c2)
{
return Complex((c1.real*c2.real+c1.imag*c2.imag)/(c2.imag*c2.imag+c2.real*c2.real),(-c1.real*c2.imag+c1.imag*c2.real)/(c2.imag*c2.imag+c2.real*c2.real));
}
void Complex::display()
{
cout<<"("<<real<<","<<imag<<"i)"<<endl;
}
//下面定义用于测试的main()函数
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;
}