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任意の桁数で0詰め2進数

Last updated at Posted at 2019-05-26

10進数 -> 2進数の表記変換はto_sメソッドを用いれば簡単にできるが、同時にフォーマットもしたい場合はformatを利用するのがよい。

irb(main):028:0> ("%04b" % 2)
=> "0010"

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