/*
 * File: SixXorSeven.java
 * ----------------------
 * This program displays the integers that
 * are divisible by either 6 or 7 but not both.
 * The lower and upper limits are defined as constants.
 *
 * Author: CS1MD3, Sept. 2008
 */

import acm.program.*;

public class SixXorSeven extends ConsoleProgram {

   public void run() {
      println("This program displays the integers between " +
               LOW_LIMIT + " and " + HIGH_LIMIT);
      println("that are divisible by either 6 or 7 but not both.");
      println("");

      boolean isFirst = true;         /* is this first number? */

      for (int i = LOW_LIMIT; i <= HIGH_LIMIT; i++) {
         if (((i % 6 == 0) || (i % 7 == 0)) && ((i % 6 != 0) || (i % 7 != 0))) {
            if (isFirst) {         /* if first */
               print(i);           /* print number */
               isFirst = false;
            } else {               /* if not first */
               print(", " + i);    /* print ", " after the previous number */
            }
         }
      }
      println(".");
   }

/* lower and upper limits, constants */
   private static final int LOW_LIMIT = 1;
   private static final int HIGH_LIMIT = 100;
}