C++ program to overload operator =, -, *, /

/* C++ program to overload =, -, *, / operator */

#include <iostream>

using namespace std;
class complex
{
    private:double r;
            double i;
    public: complex(double,double);
            complex();
            void showdata();
            complex operator+(complex);
            complex operator-(complex);
            complex operator*(complex);
            complex operator/(complex);
};

complex  ::  complex(double a,double b)
{
    r=a;
    i=b;
}

complex  ::   complex()
{
}

void  complex  ::  showdata()
{
    cout<<r<<" + "<<i<<" i";
}

complex   complex  ::   operator+(complex A)
{
    complex R;
    R.r=r+A.r;
    R.i=i+A.i;
    return(R);
}

complex  complex   ::  operator-(complex A)
{
    complex R;
    R.r=r-A.r;
    R.i=i-A.i;
    return(R);
}

complex   complex  ::  operator*(complex A)
{
    complex R;
    R.r=(r*A.r)-(i*A.i);
    R.i=(r*A.i)+(i*A.r);
    return(R);
}

complex  complex ::  operator/(complex A)
{
    complex R;
    R.r=((r*A.r)+(i*A.i))/((A.r*A.r)+(A.i*A.i));
    R.i=((i*A.r)-(r*A.i))/((A.r*A.r)+(A.i*A.i));
    return(R);
}

int main()
{
    complex  c1(2,4);
    cout<<"\n\tThe 1st complex number: ";
    c1.showdata();
    complex c2(3,4);
    cout<<"\n\tThe 2nd complex number: ";
    c2.showdata();
    
    complex c3;
    c3=c1+c2;
    cout<<"\n Result of Addition: ";
    c3.showdata();
    c3=c1-c2;
    cout<<"\n Result of Subtraction: ";
    c3.showdata();
    c3=c1*c2;
    cout<<"\n Result of Multiplication: ";
    c3.showdata();
    c3=c1/c2;
    cout<<"\n Result of Division: ";
    c3.showdata();
    
    return 0;
}

Output