complex number calc

I dont know. I figured someone would find a use for it. I wrote it for a friend for his java class. Thought it was decent bit of code and that someone else could use it sometime.

Code:

---


// complex number calc by: M.N.Chur
// please feel free to use this code for your own ends but please give credit where it is due.

package program9;

import java.io.*;
import java.lang.Math;
import java.lang.StringBuffer;

public class Main {

    /** Creates a new instance of Main */
    public Main() {
    }

    /**
    * @param args the command line arguments
    */
    public class Complex {

        private double real;        // the real number part
        private double imaginary;  // the imaginary part

        Complex(double rr, double ii) {        // Contruct a Complex

            real = rr;
            imaginary = ii;

        Complex a = new Complex(1,2);
        Complex b = new Complex(3,4);
        Complex c = new Complex(5,6);

        }
    }

      public String toString(){        // display the current Complex as a String, for use in println()
        double rr = 0;                  // Instantiate rr variable
        double ii = 0;

          StringBuffer sb = new StringBuffer().append(rr);
          if (ii>0)
              sb.append('+');          // else append(i)
          return sb.append(ii).append('i').toString();

      }
      public double getReal() {        // return the real part of equation
          return rr;
    }
      public double getImaginary() {    //return the real part
          return ii;
      }
      public double magnitude() {      // return the sq root of Complex number
          return Math.sqrt(r*r + i*i);
}

      public Complex add(Complex other) {  // adds another complex number to this one
          return add(this, other);
      }
          // Add two complexes
      public static Complex add(Complex c1,Complex c2) {
          return new Complex(c1.real + c2.real,c1.imaginary + c2.imaginary);

      }
        // Subtract two Complexes
      public Complex subract(Complex other){
          return subtract(this, other);
      }
      public static Complex subtract(Complex c1, Complex c2) {
          return new Complex(c1.real - c2.real, c1.imaginary - c2.imaginary);
      }
      // Multiply two Complexes
      public Complex multiply( Complex other) {
          return multiply(this, other);
      }
      public static Complex multiply(Complex c1, Complex c2){
      return new Complex(c1.real * c2.real - c1.imaginary * c2.imaginary, c1.real * c2.imaginary + c1.imaginary * c2.real);
        }
      // Divide two Complexes
      public static Complex divide(Complex other) {
          return divide(this, other);
      }
      public static Complex divide(Complex c1,Complex c2) {
          return new Complex ((c1.real*c2.real + c1.imaginary * c2.imaginary )/ (c2.real * c2.real + c2.imaginary * c2.imaginary),
                              (c1.imaginary * c2.real - c1.real * c2.imaginary)/ (c2.real * c2.real + c2.imaginary * c2.imaginary));
      }

        public static void main(String[] args) {
        // TODO code application logic here
        Complex c = new Complex(3,5);
        Complex d = new Complex(2,-2);
        System.out.println(c);
        System.out.println(c + ".getReal() = " + c.getReal());
        System.out.println(c + " + " + d + " = " + c.add(d));
        System.out.println(c + " + " + d + " = " + Complex.add(c, d));
        System.out.println(c + " * " + d + " = " + c.multiply(d));
        System.out.println(Complex.divide(c, d));

      }

    }

---

edit: tried to fix the way some of the indenting and such looks when posted....failed completely