Trig.java

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

/*************************************************************************
 *  Compilation:  javac Trig.java
 *  Execution:    java Trig angle
 *  
 *  Illustrates various trig operations. Reads in an angle (in degrees),
 *  converts to radians, and performs various trigonometric 
 *  calculations.
 *
 *  % java Trig
 *  sin(30.0) = 0.49999999999999994
 *  cos(30.0) = 0.8660254037844387
 *  tan(30.0) = 0.5773502691896257
 *  0.49999999999999994 / 0.8660254037844387 = 0.5773502691896256
 *  0.24999999999999994 + 0.7500000000000001 = 1.0
 *
 *************************************************************************/

public class Trig { 
   public static void main(String[] args) {
      double degrees = Double.parseDouble(args[0]);
      double radians = Math.toRadians(degrees);

      double s = Math.sin(radians);
      System.out.println("sin(" + degrees + ") = " + s);

      double c = Math.cos(radians);
      System.out.println("cos(" + degrees + ") = " + c);

      double t = Math.tan(radians);
      System.out.println("tan(" + degrees + ") = " + t);
      System.out.println(s + " / " + c + " = " + s / c);

      double r = s*s + c*c;
      System.out.println(s*s + " + " + c*c + " = " + r);
  }
}