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[Ruby]sprintfで四桁のランダムな番号生成

Last updated at Posted at 2020-09-28

##目的
PINコードを生成したかったのでsprintfとrandメソッドを使った。

コード

sprintf('%04d', rand(10000)) //四桁に対して、余ったところを0で埋める 
=>"1184"

※ dは数字を意味する。(sならstring)

##その他

sprintf('%10d', rand(10000)) //幅10の右づめ
sprintf('%-10d', rand(10000)) //幅10の左づめ
=> "      7179"
sprintf('%04d年 %02d月 %02d日', 1990, 1, 23);
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