8.8 Exercises

See Appendix A, Exercise Answers for answers.

1. Write a subroutine that takes a numeric value from 1 to 9 as an argument and then returns the English name (such as, one , two , or nine ). If the value is out of range, return the original number as the name instead. Test it with some input data; you'll probably have to write some sort of code to call the subroutine. (Hint: the subroutine should not perform any I/O.)

2. Taking the subroutine from the previous exercise, write a program that takes two numbers and then adds them together, displaying the result as Two plus two equals four . (Don't forget to capitalize the initial word!)

3. Extend the subroutine to return negative nine through negative one and zero . Try it in a program.