Do the Even questions from section 6.5.5.

(It wouldn't hurt if you studied the answers to the odd questions as well.)

In addition, do the following problem:

1. Enhance the 'table of procedures' example to print a message when the user enters an invalid choice.

2. Write a generic PROCedure to RETurn 'true' if the input character is a letter (upper- or lower- case) and 'false' otherwise.

3. Write a generic PROCedure to change its input character to uppercase -- if it is a letter. If it isn't, leave the character unchanged. (Hint: You can use your answer to #B to simplify this.)

4. Use your answer(s) to #C (and #B) to change the user input to uppercase so the example program will work even without the user hitting Shift or Caps Lock.

5. Alter the 'table of procedures' example to check for both uppercase and lowercase user input. (Do NOT use the answer(s) from #C (or #B).)

This assignment is Level 3.