使用ruby生成代表数字的字母? [英] Generate letters to represent number using ruby?

问题描述

我想生成一个字母序列，即与数字相对应的字母"A"，"DE"，"GJE"等.前26个非常简单，因此3将返回"C"，26将返回"Z"，而27将返回"AA"，28将返回"AB"，依此类推.

I would like to generate a sequence of letters i.e. "A", "DE" "GJE", etc. that correspond to a number. The first 26 are pretty easy so 3 returns "C", 26 returns "Z", and 27 would return "AA", 28 "AB", and so on.

我不太想知道的是如何执行此操作，以便它可以处理传入的任何数字.因此，如果传入4123，我应该取回3个字母的某种组合，因为(26 * 26 * 26)允许最多+17,000个组合.

The thing I can't quite figure out is how to do this so it will handle any number passed in. So if I pass in 4123 I should get back some combination of 3 letters since (26 * 26 * 26) allows for up to +17,000 combinations.

有什么建议吗?

推荐答案

class Numeric
  Alph = ("a".."z").to_a
  def alph
    s, q = "", self
    (q, r = (q - 1).divmod(26)); s.prepend(Alph[r]) until q.zero?
    s
  end
end

3.alph
# => "c"
26.alph
# => "z"
27.alph
# => "aa"
4123.alph
# => "fbo"

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