5) a) Using a byte variable, what is the largest factorial that can
	be calculated. A factorial is simply
	n! = 1 * 2 * 3 * 4 ... * (n-2) * (n-1) * n
	For instance, 1! = 1, 2! = 2, 3! = 6, 4! = 24, 5! = 120 etc....
	b) What would be the largest factorial using short, int, long, float,
	double, etc... Use all the primitive data types that you are familiar
	with signed as well as unsigned.
	Note: I want you to investigate this and the program you
	turn in should just print "cout" the final results. You don't know
	how to capture errors yet so run each till it overflows then back off by 1.
	Don't need the program that tests for this.