九九の進捗がいまいちなこどものために無限に問題を作成するヤツ

kuku.rb

# coding: utf-8

100.times do |n|
  str = ""
  20.times do |i|
    5.times do |j|
      str += (rand(9)+1).to_s + "×" + (rand(9)+1).to_s + "＝　　　"
    end
    str += "\n"
  end
  File.open("./dst/" + Time.now.to_i.to_s + "_" + sprintf("%03d", n) + ".txt", "w") do |f|
    f.write(str)
  end
end