Math::BigInt(3) Perl Programmers Reference Guide Math::BigInt(3) NAME Math::BigInt - Arbitrary size integer math package SYNOPSIS use Math::BigInt; $i = Math::BigInt->new($string); $i->bneg return BINT negation $i->babs return BINT absolute value $i->bcmp(BINT) return CODE compare numbers (undef,<0,=0,>0) $i->badd(BINT) return BINT addition $i->bsub(BINT) return BINT subtraction $i->bmul(BINT) return BINT multiplication $i->bdiv(BINT) return (BINT,BINT) division (quo,rem) just quo if scalar $i->bmod(BINT) return BINT modulus $i->bgcd(BINT) return BINT greatest common divisor $i->bnorm return BINT normalization DESCRIPTION All basic math operations are overloaded if you declare your big integers as $i = new Math::BigInt '123 456 789 123 456 789'; Canonical notation Big integer value are strings of the form /^[+-]\d+$/ with leading zeros suppressed. Input Input values to these routines may be strings of the form /^\s*[+-]?[\d\s]+$/. Output Output values always always in canonical form Actual math is done in an internal format consisting of an array whose first element is the sign (/^[+-]$/) and whose remaining elements are base 100000 digits with the least significant digit first. The string 'NaN' is used to represent the result when input arguments are not numbers, as well as the result of dividing by zero. EXAMPLES '+0' canonical zero value ' -123 123 123' canonical value '-123123123' '1 23 456 7890' canonical value '+1234567890' Autocreating constants After use Math::BigInt ':constant' all the integer decimal constants in the given scope are converted to Math::BigInt. This conversion happens at compile time. In particular perl -MMath::BigInt=:constant -e 'print 2**100' print the integer value of 2**100. Note that without convertion of constants the expression 2**100 will be calculatted as floating point number. BUGS The current version of this module is a preliminary version of the real thing that is currently (as of perl5.002) under development. AUTHOR Mark Biggar, overloaded interface by Ilya Zakharevich. 3rd Berkeley Distribution perl 5.005, patch 02 Math::BigInt(3)