Java: An Introduction to Problem Solving and Programming, 8th Edition

Answers to Self-Test Questions

1. 1.

   B
   R
   R
   R

   Note that the 'B' is the first output, not the last output.

2. 2.

   R
   R
   R
   B

   Note that the 'B' is the last output.

3. 3.

   /**
   Precondition: n >= 1.
   Displays the symbol '#' n times on one line
   and then advances to the next line.
   */
   public static void displaySharps(int n)
   {
       if (n <= 1)
          System.out.println('#');
       else
       {
          System.out.print('#');
          displaySharps(n − 1);
       }
   }

4. 4. 6

5. 5.

   /**
   Precondition: n >= 0
   Returns 10 to the power n.
   */
   public static int computeTenToThe(int n)
   {
       if (n <= 0)
          return 1;
       else
          return computeTenToThe(n − 1) * 10;
   }

6. 6.

   /**
   Precondition: n can be any int.
   Returns 10 to the power n.
   */
   public static int computeTenToThe(int n)
   {
       if (n == 0)
          return 1;
       else if (n > 0)
          return computeTenToThe(n − ...