You search for perfect numbers in assignment 9.
The next exercise we are doing problem 10.
This program reads a number of up to 9 digits. It then
prints the number in English. In other words, if you run the
program and enter 12345678, it should respond with "one hundred twenty
three million four hundred fifty six thousand seven hundred eighty
nine". If you enter 10000, it ought to print "ten
thousand". This program is intended to give you practice using
the switch statement and variable parameters in functions.