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(日本語) プログラミング: 切り捨てが floor, 切り上げが ceil になのはなぜか

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Ruby: Round Down with some decimal places

Memorized the way to round down number to the nth decimal places in Ruby.

The number like 0.81235 (Float) has function floor, which round down the number to zeal number, can’t round down to some decimal places.

Environment

  • Ruby 2.2.3p173
  • OS: Ubuntu 15.04
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