实现复数类中的运算符重载

#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)
{
    Complex c;
    c.real=c1.real+c2.real;
    c.imag=c1.imag+c2.imag;
    return c;
}
Complex operator-(const Complex &c1 ,const Complex &c2)
{
    Complex c;
    c.real=c1.real-c2.real;
    c.imag=c1.imag-c2.imag;
    return c;
}
Complex operator*(const Complex &c1 ,const Complex &c2)
{
    Complex c;
    c.real=c1.real*c2.real;
    c.imag=c1.imag*c2.imag;
    return c;
}
Complex operator/(const Complex &c1 ,const Complex &c2)
{
    Complex c;
    c.real=c1.real/c2.real;
    c.imag=c1.imag/c2.imag;
    return c;
}
void Complex::display()
{
    cout<<"("<<real<<","<<imag<<"i"<<")"<<" ";
}
//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;
}