CODEWITHSUNDEEP
javamethodscomplex-numbers
John Smith
John Smith

Reputation: 719

How can I implement my square(), modulusSqaured() and add() methods in my Complex class?

I have a class called Complex which has accessor methods for the real and imaginary numbers as well as a method to represent the complex number as a string and a method to get the magnitude of the complex number. I am having trouble implementing my last three methods square(), which squares the complex number, modulusSquared(), which returns the square of modulus of complex number and lastly add(Complex d), which will add the complex number d to this complex number. I have attempted this but I think I am understanding this wrong. Here is my code:

public class Complex { //real + imaginary*i

    private double re;
    private double im;

    public Complex(double real, double imaginary) {
        this.re = real;
        this.im = imaginary;
    }

    public String toString() { //display complex number as string
        StringBuffer sb = new StringBuffer().append(re);
        if (im>0)
          sb.append('+');
        return sb.append(im).append('i').toString();
      }

    public double magnitude() {   //return magnitude of complex number
        return Math.sqrt(re*re + im*im);
      }

    public void setReal(double m) {
        this.re = m;
    }

    public double getReal() {
        return re;
    }

    public void setImaginary(double n) {
        this.im = n;
    }

    public double getImaginary() {
        return im;
    }

    public void square() {    //squares complex number
        Complex = (re + im)*(re + im);
    }

    public void modulusSquared() {   //returns square of modulus of complex number
        Math.abs(Complex);
    }

    public void add(Complex d) {    //adds complex number d to this number

        return add(this, d);

    }

}

Thanks for your time.

Upvotes: 1

Views: 355

Answers (1)

Angelos Chalaris
Angelos Chalaris

Reputation: 6767

Your add and square methods are pretty straightforward. From what I understand modulusSquared is |x+iy| = Square Root(x^2 + y^2), so the implementation is also really simple for that, too:

public void add(Complex d) {    // adds complex number d to this number
    this.re += d.getReal();     // add real part
    this.im += d.getImaginary();// add imaginary part
}
public void square(){
    double temp1 = this.re * this.re; // real * real
    double temp2 = this.re * this.im; // real * imaginary (will be the only one to carry around an 'i' wth it
    double temp3 = -1 * this.im * this.im; // squared imaginary so multiply by -1 (i squared)
    this.re = temp1 + temp3; // do the math for real
    this.im = temp2;         // do the math for imaginary
}

public double modulusSquared() { // gets the modulus squared
    return Math.sqrt(this.re * this.re + this.im * this.im); 
}

Upvotes: 1

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