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桁数指定ゼロ埋め
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| # % (String) - https://docs.ruby-lang.org/ja/latest/class/String.html#I_--25 | |
| puts "%02d" % 0 # 00 | |
| puts "%02d" % 9 # 09 | |
| puts "%02d" % 99 # 99 | |
| puts "%02d" % 100 # 100 | |
| puts "%04d" % 0 # 0000 | |
| puts "%04d" % 9 # 0009 | |
| puts "%04d" % 99 # 0099 | |
| puts "%04d" % 100 # 0100 | |
| puts "%04d" % 9999 # 9999 | |
| puts "%04d" % 99999 # 99999 |
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