定义一个复数类Complex,重载运算符“＋”、“－”、“*”和“/”,使之能用于复数的加、减、乘和除.

定义一个复数类Complex,重载运算符“＋”、“－”、“*”和“/”,使之能用于复数的加、减、乘和除.
运算符重载函数作为Complex类的成员函数.编写程序,分别求两个复数的和、差、积和商

#include <iostream>
using namespace std;

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

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

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

} 
void Complex::set()
{
cout<<"input real=";cin>>real;
cout<<"  imag=";cin>>imag;
}
void Complex::display()
{
    cout<<"("<<real<<","<<imag<<"i)"<<endl;
}  

int main()
{
Complex c1,c2,c3,c4,c5,c6;
c1.set();
c2.set();
c3=c1+c2;
c4=c1-c2;
c5=c1*c2;
c6=c1/c2;
cout<<"c1=";c1.display();
cout<<"c2=";c2.display();
cout<<"c1+c2=";c3.display();
cout<<"c1-c2=";c4.display();
cout<<"c1*c2=";c5.display();
cout<<"c1/c2=";c6.display();
return 0;
}