# [SOLVED] Ruby- prime number unique and duplicates

## Issue

I’m just learning Ruby ðŸ™‚ and Im trying to create a simple prime-number program where all the primes of a number are printed.

I’m getting errors where the prime and nonprime numbers are mixed up
(ie: input of 9 will get you all nonprimes).

I’m sorry for such a beginner question – I’m struggling alot and need some help ðŸ™‚

``````puts "Enter a number please "
num = gets.chomp.to_i

i = 2
number = 2

while i < num
if number % i == 0
prime = false
end
i += 1
end
if prime == true
puts "#{number} is prime"
else
puts "#{number} is not prime"
end
number += 1
end
``````

## Solution

``````while i < num
if number % i == 0
prime = false
end
i += 1
end
# ...
``````

It looks like that first `end` is meant to be an `else`.

It’s easier to catch these things when you simplify your code, e.g. this method reduces to this (although there are other issues with it):

``````i = 2
number = 2

while i < num
(number % i).zero? ? prime = false : i += 1
puts "#{number} is #{'not ' unless prime}prime"
number += 1
end
``````

Answered By – Mori

Answer Checked By – Dawn Plyler (BugsFixing Volunteer)