Example: Add Two Complex Numbers

public class Complex{

    double real;
    double imag;

    public Complex(double real, double imag){
        this.real = real;
        this.imag = imag;
    }

    public static void main(String[] args){
        Complex n1 = new Complex(2.3, 4.5),
                n2 = new Complex(3.4, 5.0),
                temp;

        temp = add(n1, n2);

        System.out.printf("Sum = %.1f + %.1fi", temp.real, temp.imag);
    }

    public static Complex add(Complex n1, Complex n2){
        Complex temp = new Complex(0.0, 0.0);

        temp.real = n1.real + n2.real;
        temp.imag = n1.imag + n2.imag;

        return(temp);
    }
}

Output

Sum = 5.7 + 9.5i

In the above program, we created a class Complex with two member variables: real and imag. As name suggests, real stores real part of a complex number and imag stores the imaginary part.

The Complex class has a constructor with initializes the value of real and imag.

We also created a new static function add() that takes two complex numbers as parameters and returns the result as a complex number.

Inside the add() method, we just add the real and imaginary parts of complex numbers n1 and n2, store it in a new variable temp and return temp.

Then, in the calling function main(), we print it using printf() function.