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michaelrkn/factorial.rb

Forked from pjlowry/factorial.rb
Last active December 11, 2015 16:48
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factorial.rb
def factorial(n)
if n < 0
raise "You can't take the factorial of a negative number."
elsif n == 0
1
else
(1..n).inject(:*)
end
end
puts "'#{factorial(5)}' should equal '120'."
puts "'#{factorial(0)}' should equal '1'."
puts "'#{factorial(25)}' should equal '15511210043330985984000000'."
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