How to calculate factorial in ruby

Question

QUESTION :

Input:
  4 # number of input 
  1
  2
  4
  3
Output:
  1
  2
  24
  6

CANNOT GET DESIRED OUTPUT

My code:
num  = Integer(gets.chomp)
k = []
for i in 1..num
k[i] = Integer(gets.chomp)
end

k.each do |w|
for i in 1..w
w.to_i = w*i
end
puts w 
end

What is `w.to_i = w*i` supposed to mean? How can you assign to the result of a `to_i` call? — tadman, Apr 25 '14 at 16:34
Instead of asking for "give me the code" if you could ask "help me to figure it out", at least you would not get so many downvotes! — Sharif Mamun, Apr 25 '14 at 16:35

Santhosh · Answer 1 · 2014-04-27T16:20:44.387

1

To get factorial of n

(1..n).inject :*

To take care of zero

(1..n).inject(1, :*)

edited Apr 27 '14 at 16:20

answered Apr 26 '14 at 08:21

Santhosh

score 0 · Accepted Answer · answered Apr 25 '14 at 16:36

0

you can try like:

input = Integer(gets.chomp) 
ans = 1
for i in 1..input
 ans = ans*i
end
print(ans)

answered Apr 25 '14 at 16:36

SNEH PANDYA

2 Answers2