实现复数类中的运算符重载（1）

/*
* 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：胡庆龙
* 完成日期：2016年5月19日
* 版 本 号：v1.0
*
* 问题描述：（1）请用类的成员函数，定义复数类重载运算符+、-、*、/，使之能用于复数的加减乘除
*/
#include <iostream>
using namespace std;

class Complex
{
public:
Complex(){real = 0;imag = 0;}
Complex(double r, double i){real = r;imag = i;}
Complex operator+(const Complex &c2);
Complex operator-(const Complex &c2);
Complex operator*(const Complex &c2);
Complex operator/(const Complex &c2);
void display();
private:
double real;
double imag;
};

Complex Complex::operator+(const Complex &c2)
{
Complex temp;
temp.real = real + c2.real;
temp.imag = imag + c2.imag;
return temp;
}

Complex Complex::operator-(const Complex &c2)
{
Complex temp;
temp.real = real - c2.real;
temp.imag = imag - c2.imag;
return temp;
}

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

Complex Complex::operator/(const Complex &c2)
{
Complex temp;
temp.real = (real*c2.real + imag*c2.imag)/(c2.real*c2.real + c2.imag*c2.imag);
temp.imag = (imag*c2.real - real*c2.imag)/(c2.real*c2.real + c2.imag*c2.imag);
return temp;
}

void Complex::display()
{
cout << real;
if(imag > 0)
cout << "+" << imag << "i" << endl;
if(imag < 0)
cout << 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();
}