## 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&gt;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
}
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