/*
 * A class to illustrate random number generation for coin flipping.
 */

import java.util.Random; // Import the Random utility library function.

public class RandomCoinFlip
  {
  /*
   * Print out a random sequence of the words "heads" and "tails" for
   * a random number of times.
   */
  public static void main(String[] args)
    {
    /* Here we create a Random object. */ 
    Random flipper = new Random();

    /* 
     * This loop randomly chooses "heads" or "tails" a random number of times.
     */
    boolean keepGoing = true;
    while(keepGoing)
      {
      int flip = flipper.nextInt(2); // Choose a random number from 0 to 1.
      switch(flip)  // Output a heads or tails based on the random number.
        {
        case 0:
          System.out.println("heads");
          break;
        case 1:
  	  System.out.println("tails");
	  break;
        }
      flip = flipper.nextInt(10); // Choose a random number from 0 to 9.
      switch(flip) // Set the keepGoing flag based on the random number.
        {
        case 0: 
  	  keepGoing = false;
	  break;
        default:
  	  keepGoing = true;
	  break;
        }
      }
    }
  }