Write a program that will find the GCD (greatest common divisor) of two integers. It is the largest number that will evenly divide into both integers. For example, the GCD of 12 and 16 is 4.

You should have at least one function that will calculate and return the GCD.

Sample Run #1: (the bold text is what the user types)

Numbers? 12 16

GCD = 4

Press any key to continue . . .