#!/usr/bin/python

# Program to display factorials and test "fact.py".

import fact
import sys
import string

args = sys.argv[1:]
if (args == []):
	print "This program displays the factorial of a mathematical expression."
	print
	print "Usage:", sys.argv[0], "expression"
else:
	num = eval(string.join(args))
	print "fact(", num, ") =", fact.fact(num)
