/*************************************************************************
 *  Compilation:  javac Polar.java
 *  Execution:    java Polar x y
 *  
 *  Read in Cartesian coordinates (x, y) and print out polar coordinates
 *  (r, theta).
 *
 *************************************************************************/

public class Polar { 
    public static void main(String[] args) { 
        double x = Double.parseDouble(args[0]);
        double y = Double.parseDouble(args[1]);
        
        double r     = Math.sqrt(x*x + y*y);
        double theta = Math.atan2(x, y);

        System.out.println("r     = " + r);
        System.out.println("theta = " + theta);
    }

}