NAME

       Math::BaseCalc - Convert numbers between various bases

VERSION

       version 1.017

SYNOPSIS

         use Math::BaseCalc;

         my $calc = new Math::BaseCalc(digits => [0,1]); #Binary
         my $bin_string = $calc->to_base(465); # Convert 465 to binary

         $calc->digits('oct'); # Octal
         my $number = $calc->from_base('1574'); # Convert octal 1574 to decimal

DESCRIPTION

       This module facilitates the conversion of numbers between various number bases.  You may define your own
       digit sets, or use any of several predefined digit sets.

       The to_base() and from_base() methods convert between Perl numbers and strings which represent these
       numbers in other bases.  For instance, if you're using the binary digit set [0,1], $calc->to_base(5) will
       return the string "101".  $calc->from_base("101") will return the number 5.

       To convert between, say, base 7 and base 36, use the 2-step process of first converting to a Perl number,
       then to the desired base for the result:

        $calc7  = new Math::BaseCalc(digits=>[0..6]);
        $calc36 = new Math::BaseCalc(digits=>[0..9,'a'..'z']);

        $in_base_36 = $calc36->to_base( $calc7->from_base('3506') );

       If you just need to handle regular octal & hexdecimal strings, you probably don't need this module.  See
       the sprintf(), oct(), and hex() Perl functions.

METHODS

       •   new Math::BaseCalc

       •   new Math::BaseCalc(digits=>...)

           Create a new base calculator.  You may specify the digit set to use, by either giving the digits in a
           list reference (in increasing order, with the 'zero' character first in the list) or by specifying
           the name of one of the predefined digit sets (see the digit() method below).

           If your digit set includes the character "-", then a dash at the beginning of a number will no longer
           signify a negative number.

       •   $calc->to_base(NUMBER)

           Converts a number to a string representing that number in the associated base.

           If "NUMBER" is a "Math::BigInt" object, "to_base()" will still work fine and give you an exact result
           string.

       •   $calc->from_base(STRING)

           Converts a string representing a number in the associated base to a Perl integer.  The behavior when
           fed strings with characters not in $calc's digit set is currently undefined.

           If "STRING" converts to a number too large for perl's integer representation, beware that the result
           may be auto-converted to a floating-point representation and thus only be an approximation.

       •   $calc->digits

       •   $calc->digits(...)

           Get/set the current digit set of the calculator.  With no arguments, simply returns a list of the
           characters that make up the current digit set.  To change the current digit set, pass a list
           reference containing the new digits, or the name of a predefined digit set.  Currently the predefined
           digit sets are:

                  bin => [0,1],
                  hex => [0..9,'a'..'f'],
                  HEX => [0..9,'A'..'F'],
                  oct => [0..7],
                  64  => ['A'..'Z','a'..'z',0..9,'+','/'],
                  62  => [0..9,'a'..'z','A'..'Z'],

            Examples:
             $calc->digits('bin');
             $calc->digits([0..7]);
             $calc->digits([qw(w a l d o)]);

           If any of your "digits" has more than one character, the behavior is currently undefined.

QUESTIONS

       The '64' digit set is meant to be useful for Base64 encoding.  I took it from the MIME::Base64.pm module.
       Does it look right?  It's sure in a strange order.

AUTHOR

       Ken Williams, ken@forum.swarthmore.edu

COPYRIGHT

       This is free software in the colloquial nice-guy sense of the word.  Copyright (c) 1999, Ken Williams.
       You may redistribute and/or modify it under the same terms as Perl itself.

SEE ALSO

       perl(1).