Factorial of a number in Ruby

  1. A.Factorials are very simple things. They're just products, indicated by an exclamation mark. For instance, "four factorial" is written as "4!" and means 1×2×3×4 = 24. In general, n! ("n factorial") means the product of all the whole numbers from 1 to n; that is, n! = 1×2×3×...×n.
  2. Factorial of a number in Ruby
#!/usr/bin/ruby
puts "Enter a Number"
n=gets.to_i
fact=1
for i in 1..n
fact=fact*i
end
puts fact.

Out put:
Enter a Number
5
120

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