# phpman > man > Math::BigInt::GMP(3pm)

## NAME
    [Math::BigInt::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMP/markdown) - backend library for [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown) etc. based on GMP

## SYNOPSIS
        # to use it with [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown)
        use [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown) lib => 'GMP';

        # to use it with [Math::BigFloat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigFloat/markdown)
        use [Math::BigFloat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigFloat/markdown) lib => 'GMP';

        # to use it with [Math::BigRat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigRat/markdown)
        use [Math::BigRat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigRat/markdown) lib => 'GMP';

## DESCRIPTION
    [Math::BigInt::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMP/markdown) is a backend library for [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown), [Math::BigFloat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigFloat/markdown), [Math::BigRat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigRat/markdown) and
    related modules.

    [Math::BigInt::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMP/markdown) provides support for big integer calculations by means of the GMP C library.
    See <<https://gmplib.org/>> for more information about the GMP library.

    [Math::BigInt::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMP/markdown) no longer uses [Math::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3AGMP/markdown), but provides its own XS layer to access the GMP C
    library. This cuts out another (Perl subroutine) layer and also reduces the memory footprint.

    [Math::BigInt::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMP/markdown) inherits from [Math::BigInt::Lib](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ALib/markdown).

## STATIC FUNCTIONS
  $str = gmp_version();
    Returns the underlying GMP library's version as a string, e.g., 6.2.1.

## BUGS
    Please report any bugs or feature requests to "bug-math-bigint-gmp at rt.cpan.org", or through
    the web interface at <<https://rt.cpan.org/Ticket/Create.html?Queue=Math-BigInt-GMP>> (requires
    login). We will be notified, and then you'll automatically be notified of progress on your bug
    as I make changes.

## SUPPORT
    After installing, you can find documentation for this module with the perldoc command.

        perldoc [Math::BigInt::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMP/markdown)

    You can also look for information at:

    GitHub
        <<https://github.com/pjacklam/p5-Math-BigInt-GMP>>

    RT: CPAN's request tracker
        <<https://rt.cpan.org/Dist/Display.html?Name=Math-BigInt-GMP>>

    MetaCPAN
        <<https://metacpan.org/release/Math-BigInt-GMP>>

    CPAN Testers Matrix
        <<http://matrix.cpantesters.org/?dist=Math-BigInt-GMP>>

    CPAN Ratings
        <<https://cpanratings.perl.org/dist/Math-BigInt-GMP>>

## LICENSE
    This program is free software; you may redistribute it and/or modify it under the same terms as
    Perl itself.

## AUTHORS
    Tels <<http://bloodgate.com/>> in 2001-2007.

    Thanks to Chip Turner (CHIPT on CPAN) for providing [Math::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3AGMP/markdown), which was inspiring my work.

    Maintained by Peter John Acklam <<pjacklam@gmail.com>> 2010-2021.

### gmp_version

## SEE ALSO
    [Math::BigInt::Lib](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ALib/markdown) for a description of the API.

    Alternative libraries [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown), [Math::BigInt::FastCalc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AFastCalc/markdown), and [Math::BigInt::Pari](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3APari/markdown).

    Some of the modules that use these libraries [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown), [Math::BigFloat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigFloat/markdown), and [Math::BigRat](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigRat/markdown).