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komasaru/prime_number_1.rb

Last active January 18, 2022 23:21
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Ruby script to check a prime number.
Raw
prime_number_1.rb
#! /usr/local/bin/ruby
# coding: utf-8
# --------------------------------------
# Check a prime number
# --------------------------------------
def is_prime(n)
res = (2..Math.sqrt(n)).any? { |i| n % i == 0 }
puts "#{n}: #{res || n == 1 ? '-----' : "PRIME"}"
end
is_prime(12345678923)
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