Before starting to program, we need to have a
plan.
Any time you need something more than once,
it's a good idea to turn that into a function..
Rather than writing the entire function, begin
by writing the comments.
Example: Writing the function
/**
Turns a number into its English name.
@param n a positive integer < 1,000,000
@return the name of n (e.g. "two hundred seventy four"
*/
string int_name(int n);