Information about quizzes:

• On the date a quiz is given, a die will be thrown by a student in the class.
• Books and notes are put away.
• A question very similar to the chosen published question will be written on the board.
• You have 5 minutes to answer the question.

You will fare better on the quiz if you try working the problems before looking at the solutions. If you don't understand the question or its answer, please get help.

1. Define the class StackBasedQueueOfInts given the class StackOfInts.
2. Define the class QueueBasedStackOfInts given the class QueueOfInts.
3. Why can't we implement StackBasedQueueOfInts and QueueBasedStackOfInts in terms of each other?
4. Consider the class

   public class Rectangle {
      protected int length, width;
      protected Rectangle() {
         length = 0;
         width  = 0;
      }
      public Rectangle(int length, int width) {
         this.length = length;
         this.width  = width;
      }
      public int area()      { return length * width;     }
      public int perimeter() { return 2*length + 2*width; }
   }
   

   Write a class for a Square by extending this class.