See Appendix A for the answers.
Extend the problem from the last chapter to repeat the operation until the word end is entered for one of the values. (Hint: use an infinite loop, and then do a last if either value is end.)
Rewrite the exercise from Chapter 4, summing numbers up to 999, using a loop that exits from the middle. (Hint: use a naked block with a redo at the end to get an infinite loop and a last in the middle based on a condition.)