#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=imag*c2.real+real*c2.imag;  
    return c;  
}  
Complex Complex::operator/(const 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::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;  
}