CartesianToPolar.java

Below is the syntax highlighted version of CartesianToPolar.java from §1.2 Built-in Types of Data.

/******************************************************************************
 *  Compilation:  javac CartesianToPolar.java
 *  Execution:    java CartesianToPolar x y
 *
 *  Read in Cartesian coordinates (x, y) and print out polar coordinates
 *  (r, theta).
 *
 *  %  java CartesianToPolar 3.0 4.0
 *  r     = 5.0
 *  theta = 0.9272952180016122
 *
 ******************************************************************************/

public class CartesianToPolar {
    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(y, x);

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

}