Non-decimal radices/Convert: Difference between revisions
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=={{header|Ruby}}==
<lang ruby>s = 26.to_s(16) # returns the string 1a
i = '1a'.to_i(16) # returns the integer 26</lang>
Caution: <tt>to_i</tt> simply stops when it reaches an invalid character; it does not raise any exceptions. So sometimes it may appear to parse something and get a result, but it is only based on part of the input string:
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{{trans|Tcl}}
<lang ruby>module BaseConvert
DIGITS = [*"0".."9", *"a".."z"]
def baseconvert(str, basefrom, baseto)
dec2base(base2dec(str, basefrom), baseto)
end
def base2dec(str, base)
raise ArgumentError, "base is invalid" unless base.between?(2, DIGITS.length)
str.to_s.downcase.each_char.inject(0) do |res, c|▼
▲ str.to_s.downcase.each_char do |c|
▲ idx = DIGITS[0,base].find_index(c)
idx.nil? and raise ArgumentError, "invalid base-#{base} digit: #{c}"
res = res * base + idx
end
end
def dec2base(n, base)
return "0" if n == 0
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res.unshift(DIGITS[r])
end
res.join
end
end
include BaseConvert
p dec2base(26, 16) # => "1a"
p base2dec("1a", 16) # => 26
p baseconvert("107h", 23, 7) # => "50664"</lang>
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