complex number calculation

 /**

 * complexcalculation

 */

public class complexcalculation {

    public static void main(String[] args) {

        complex c = new complex(3, 5);

        complex d = new complex(4, 5);

        complex e = complex.add(c, d);

        complex f = complex.sub(c, d);

        complex g = complex.mul(c, d);

        e.print();

        f.print();

        g.print();

    }

}

class complex {

    int real;

    int imag;

    public complex(int r, int i) {

        real = r;

        imag = i;

    }

    public static complex add(complex a, complex b) {

        return new complex((a.real + b.real), (a.imag + b.imag));

    }

    public static complex sub(complex a, complex b) {

        return new complex((a.real - b.real), (a.imag - b.imag));

    }

    public static complex mul(complex a, complex b) {

        return new complex((a.real * b.real) - (a.imag * b.imag), (a.real + b.imag) + (a.imag + b.real));

    }

    public void print() {

        System.out.println(real + "+" + imag + "i");

    }

}