Question

How to get the factorial of a number in Ruby

Answer 1

def getFactorial(number)
    factorial = 1
    if (number == 0)
        puts "Error! number == 0"
    else
        counter = 1 
        while (counter <= number)
            factorial = factorial * counter 
        counter += 1
    end
  end
    puts "factorial of #{number} = #{factorial}"
end


getFactorial(5)
getFactorial(7)




# 
# run:
#
# factorial of 5 = 120
# factorial of 7 = 5040
#

 

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