Beginner Java working with complex numbers: Java, complex, numbers

Beginner Java working with complex numbers

I need to write a ComplexNumber class with:

(1)      a constructor which does not take any parameters (where the default value of a complex number should be 0 + 0i in this case.)

(2) another constructor that takes real and imaginary parts of type int as parameters

(3)      an add method which takes another complex number, c2, as a parameter and adds c2 to
the current complex number, which is this, and returns the resulting complex number.
(4)      a subtract method which takes another complex number, c2, as a parameter and subtracts c2 from the current complex number this, and returns the resulting complex number.

(5)      a multiply method which takes another complex number, c2, as a parameter and multiplies c2 with the current complex number this, and returns the resulting complex number.

(6)      a divide method which takes another complex number, c2, as a parameter and divides the current complex number this by c2, and returns the resulting complex number.

(7)      a toString1 method that will print a String that is the current complex number in the form of a + bi, where a and b will be the values of the real and imaginary parts of the natural number.

Thanks everyone!

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public class ComplexNumberTest { // The real part private double r; // The imaginary part private double i; public ComplexNumberTest() { r = 0; i = 0; } // Construct a Complex Number public ComplexNumberTest(double rr, double ii) { r = rr; i = ii; } }

Here you have the code:

public class ComplexNumber { 
    private int re; // Real part
    private int im; // Immaginary part 
    public ComplexNumber() {
        re = 0;
        im = 0;
    } 
    public ComplexNumber(int rePart, int imPart) {
        re = rePart;
        im = imPart;
    } 
    public ComplexNumber add(ComplexNumber c2)
    {
        return new ComplexNumber(this.re + c2.re, this.im + c2.im);
    } 
    public ComplexNumber substract(ComplexNumber c2)
    {
        return new ComplexNumber(this.re - c2.re, this.im - c2.im);
    } 
    public ComplexNumber multiply(ComplexNumber c2)
    {
        ComplexNumber c3 = new ComplexNumber();
        c3.re = this.re * c2.re - this.im * c2.im;
        c3.im = this.re * c2.im + this.im * c2.re;
        return c3;
    } 
    public ComplexNumber divide(ComplexNumber c2)
    {
        ComplexNumber c3 = new ComplexNumber();
        c3.re = this.re / c2.re - this.im / c2.im;
        c3.im = this.re / c2.im + this.im / c2.re;
        return c3;
    } 
    public String toString()
    {
        return this.re + " + " + this.im + "i";
    }
}

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Beginner Java working with complex numbers

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