Non-decimal radices/Convert: Difference between revisions
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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<lang ruby>s = 26.to_s(16) # returns the string 1a |
<lang ruby>s = 26.to_s(16) # returns the string 1a |
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i = '1a'.to_i(16) # returns the integer 26</lang> |
i = '1a'.to_i(16) # returns the integer 26</lang> |
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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: |
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}} |
{{trans|Tcl}} |
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<lang ruby>module BaseConvert |
<lang ruby>module BaseConvert |
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DIGITS = [*"0".."9", *"a".."z"] |
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DIGITS = %w{0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y z} |
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def baseconvert(str, basefrom, baseto) |
def baseconvert(str, basefrom, baseto) |
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dec2base(base2dec(str, basefrom), baseto) |
dec2base(base2dec(str, basefrom), baseto) |
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end |
end |
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def base2dec(str, base) |
def base2dec(str, base) |
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raise ArgumentError, "base is invalid" unless base.between?(2, DIGITS.length) |
raise ArgumentError, "base is invalid" unless base.between?(2, DIGITS.length) |
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res = 0 |
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idx.nil? and raise ArgumentError, "invalid base-#{base} digit: #{c}" |
idx.nil? and raise ArgumentError, "invalid base-#{base} digit: #{c}" |
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res = res * base + idx |
res = res * base + idx |
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end |
end |
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res |
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end |
end |
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def dec2base(n, base) |
def dec2base(n, base) |
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return "0" if n == 0 |
return "0" if n == 0 |
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res.unshift(DIGITS[r]) |
res.unshift(DIGITS[r]) |
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end |
end |
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res.join |
res.join |
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end |
end |
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end |
end |
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include BaseConvert |
include BaseConvert |
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p dec2base(26, 16) # => "1a" |
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p base2dec("1a", 16) # => 26 |
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p baseconvert("107h", 23, 7) # => "50664"</lang> |
p baseconvert("107h", 23, 7) # => "50664"</lang> |
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