A Program to Compute Factorials
how many numbers?  
enter 10 numbers, separated by whitespace

7 factorial is 5040
6 factorial is 720
5 factorial is 120
-4 factorial is -1
10 factorial is 3628800
20 factorial is -2102132736
40 factorial is 0
5 factorial is 120
2 factorial is 2
1 factorial is 1