class A1426kt_prime_number

Public Instance Methods

determine_prime(num) click to toggle source

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# File lib/a1426kt_prime_number.rb, line 5
def determine_prime(num)

  if num == 1 || num == 2 then
    return "This is the prime number."
  end

  if num % 2 == 0 then
    return "This is not the prime number."
  end

  i = 3

  while true
    if num == i then
      return "This is the prime number."
    end
    if num % i == 0 then
      return "This is not the prime number."
    end
    i = i + 2
  end

end