Arithmetic operations on complex numbers using operator overloading using C++ language.

 Program:

# include<iostream>

using namespace std;

class Complex

{

    double real;

    double img;

    public:

    Complex();

    friend istream & operator >> (istream &, Complex &);

    friend ostream & operator << (ostream &, const Complex &);

    Complex operator + (Complex);

    Complex operator * (Complex);

};

Complex::Complex()

{

    real = 0;

    img = 0;

}

istream & operator >> (istream &, Complex & i)

{

    cin >> i.real >> i.img;

    return cin;

}

ostream & operator << (ostream &, const Complex & d)

{

    cout << d.real << " + " << d.img << "i" << endl;

    return cout;

}

Complex Complex::operator + (Complex c1)

{

    Complex temp;

    temp.real = real + c1.real;

    temp.img = img + c1.img;

    return temp;

}

Complex Complex::operator * (Complex c2)

{

    Complex tmp;

    tmp.real = real * c2.real - img * c2.img;

    tmp.img = real * c2.img + img * c2.real;

    return tmp;

}

int main()

{

    Complex C1, C2, C3, C4;

    int flag = 1;

    char b;

    while (flag == 1)

    {

        cout << "Enter Real and Imaginary part of the Complex Number 1 : \n";

        cin >> C1; 2+4i;

        cout << "Enter Real and Imaginary part of the Complex Number 2 : \n";

        cin >> C2; 3+2i;

        int f = 1;

        while (f == 1)

        {

            cout << "Complex Number 1 : " << C1 << endl; 2+4i;

            cout << "Complex Number 2 : " << C2 << endl; 3+2i;

            cout << "**********MENU**********" << endl;

            cout << "1. Addition of Complex Numbers" << endl;

            cout << "2. Multiplication of Complex Numbers" << endl;

            cout << "3. Exit\n";

            int a;

            cout << "Enter your choice from above MENU (1 to 3) : ";

            cin >> a;

            if (a == 1)

            {

                C3 = C1+C2;

                cout << "Addition : " << C3 << endl;

                cout << "Do you want to perform another operation (y/n) : \n";

                cin >> b;

                if (b == 'y' || b == 'Y')

                {

                    f=1;

                }

                else

                {

                    cout << "Thanks for using this program!!\n";

                    flag=0;

                    f=0;

                }

            }

            else if (a == 2)

            {

                C4 = C1 * C2;

                cout << "Multiplication : " << C4 << endl;

                cout << "Do you want to perform another operation (y/n) : \n";

                cin >> b;

                if (b == 'y' || b == 'Y')

                {

                    f=1;

                }

                else

                {

                    cout << "Thanks for using this program!!\n";

                    flag=0;

                    f=0;

                }

            }

            else

            {

                cout << "Thanks for using this program!!\n";

                flag=0;

                f=0;

            }

        }

    }

    return 0;

}

Output:

Enter Real and Imaginary part of the Complex Number 1 :

4

6

Enter Real and Imaginary part of the Complex Number 2 :

2

3

Complex Number 1 : 4 + 6i

Complex Number 2 : 2 + 3i

**********MENU**********

1. Addition of Complex Numbers

2. Multiplication of Complex Numbers

3. Exit

Enter your choice from above MENU (1 to 3) : 1

Addition : 6 + 9i

Do you want to perform another operation (y/n) :

y

Complex Number 1 : 4 + 6i

Complex Number 2 : 2 + 3i

**********MENU**********

1. Addition of Complex Numbers

2. Multiplication of Complex Numbers

3. Exit

Enter your choice from above MENU (1 to 3) : 2

Multiplication : -10 + 24i

Do you want to perform another operation (y/n) :

n

Thanks for using this program!!