复数类中的运算符重载

输入代码：

/*
* Copyright (c) 2015, 烟台大学计算机学院
 * All rights reserved.
 * 文件名称：sum123.cpp
 * 作    者：林海云
 * 完成日期：2015年4月28日
 * 版 本 号：v2.0
 *
 * 问题描述: 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
 * 输入描述：无
 * 程序输出:输出按要求设计的复数结果
*/
#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 c;
    c.real=real+c2.real;
    c.imag=imag+c2.imag;
    return c;
}
Complex Complex:: operator-(const Complex &c2)
{
    Complex c;
    c.real=real-c2.real;
    c.imag=imag-c2.imag;
    return c;
}
Complex Complex:: operator*(const Complex &c2)
{
    Complex c;
    c.real=real*c2.real-imag*c2.imag;
    c.imag=real*c2.real+imag*c2.imag;
    return c;
}
Complex Complex::operator/(const 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=(imag*c2.real-real*c2.imag)/d;
    return c;
}
void Complex::display()
{
    cout<<"("<<real<<","<<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();
    return 0;
}

运行结果：