#!/usr/bin/env ruby

#
# rFactorial0.rb
#
# Victor Hanson-Smith (with mods by Steve Fickas)
# QUESTIONS? -> {victorhs,fickas}@cs.uoregon.edu
#
# This Ruby script recursively computes the factorial of an integer.
#

def fact(n)
   if n < 0
	puts "factorial is undefined for negative numbers\n"
	exit #Halts all computation. In essence, crashes.
   end

   if n == 0
	1
   else
	return n * fact(n-1)
   end
end