public class ValueOfDemo {
  public static void main(String[] args) {

    //this program requires two arguments on the command line
    if (args.length == 2) {

      //convert strings to numbers
      float a = Float.valueOf(args[0]).floatValue();
      float b = Float.valueOf(args[1]).floatValue();

      //do some arithmetic
      System.out.println("a + b = " + (a + b) );
      System.out.println("a - b = " + (a - b) );
      System.out.println("a * b = " + (a * b) );
      System.out.println("a / b = " + (a / b) );
      System.out.println("a % b = " + (a % b) );
    } else {
      System.out.println("This program requires two command-line arguments.");
    }
  }
}