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Ruby / nibai.rb
@SUGAWARA Rento SUGAWARA Rento on 21 Oct 161 bytes 2023-10-21 20:08:42
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#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

def nibai(x)
  x*2
end

puts "数値を入れてください。2倍します。"
y=gets.to_i
printf("%d\n",nibai(y)