# info > Math::BigInt::Calc

## [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown)(3pmUser Contributed Perl [DocumentatiMath::BigInt](https://www.chedong.com/phpMan.php/perldoc/DocumentatiMath%3A%3ABigInt/markdown)::[Calc(3pm)](https://www.chedong.com/phpMan.php/man/Calc/3pm/markdown)

## NAME
       [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown) - pure Perl module to support [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown)

## 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 => 'Calc';

           # 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 => 'Calc';

           # 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 => 'Calc';

           # explicitly set base length and whether to "use integer"
           use [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown) base_len => 4, use_int => 1;
           use [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown) lib => 'Calc';

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

       In this library, the numbers are represented interenally in base B =
       10**N, where N is the largest possible integer that does not cause
       overflow in the intermediate computations. The base B elements are
       stored in an array, with the least significant element stored in array
       element zero. There are no leading zero elements, except a single zero
       element when the number is zero. For instance, if B = 10000, the number
       1234567890 is represented internally as [7890, 3456, 12].

## OPTIONS
       When the module is loaded, it computes the maximum exponent, i.e.,
       power of 10, that can be used with and without "use integer" in the
       computations. The default is to use this maximum exponent. If the
       combination of the 'base_len' value and the 'use_int' value exceeds the
       maximum value, an error is thrown.

       base_len
           The base length can be specified explicitly with the 'base_len'
           option. The value must be a positive integer.

               use [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown) base_len => 4;  # use 10000 as internal base

       use_int
           This option is used to specify whether "use integer" should be used
           in the internal computations. The value is interpreted as a boolean
           value, so use 0 or "" for false and anything else for true. If the
           'base_len' is not specified together with 'use_int', the current
           value for the base length is used.

               use [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown) use_int => 1;   # use "use integer" internally

## METHODS
       This overview constains only the methods that are specific to
       "[Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown)". For the other methods, see [Math::BigInt::Lib](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ALib/markdown).

       _base_len()
           Specify the desired base length and whether to enable "use integer"
           in the computations.

               [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown) -> _base_len($base_len, $use_int);

           Note that it is better to specify the base length and whether to
           use integers as options when the module is loaded, for example like
           this

               use [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown) base_len => 6, use_int => 1;

## 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::FastCalc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AFastCalc/markdown), [Math::BigInt::GMP](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMP/markdown),
       [Math::BigInt::Pari](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3APari/markdown), [Math::BigInt::GMPz](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3AGMPz/markdown), and [Math::BigInt::BitVect](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ABitVect/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).

perl v5.32.1                      2021-12-31           [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown)::[Calc(3pm)](https://www.chedong.com/phpMan.php/man/Calc/3pm/markdown)
## [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown)(3perPerl Programmers Reference [GuiMath::BigInt](https://www.chedong.com/phpMan.php/perldoc/GuiMath%3A%3ABigInt/markdown)::[Calc(3perl)](https://www.chedong.com/phpMan.php/man/Calc/3perl/markdown)

## NAME
       [Math::BigInt::Calc](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt%3A%3ACalc/markdown) - Pure Perl module to support [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown)

## 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 => 'Calc';

           # 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 => 'Calc';

           # 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 => 'Calc';

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

       In this library, the numbers are represented in base B = 10**N, where N
       is the largest possible value that does not cause overflow in the
       intermediate computations. The base B elements are stored in an array,
       with the least significant element stored in array element zero. There
       are no leading zero elements, except a single zero element when the
       number is zero.

       For instance, if B = 10000, the number 1234567890 is represented
       internally as [7890, 3456, 12].

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

perl v5.34.0                      2026-06-23         [Math::BigInt](https://www.chedong.com/phpMan.php/perldoc/Math%3A%3ABigInt/markdown)::[Calc(3perl)](https://www.chedong.com/phpMan.php/man/Calc/3perl/markdown)