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Math::BigInt::Calc

Section: User Contributed Perl Documentation (3)
Updated: 2022-07-03
Index

NAME

Math::BigInt::Calc - pure Perl module to support Math::BigInt

SYNOPSIS

    # to use it with Math::BigInt    use Math::BigInt lib => 'Calc';    # to use it with Math::BigFloat    use Math::BigFloat lib => 'Calc';    # to use it with Math::BigRat    use Math::BigRat lib => 'Calc';    # explicitly set base length and whether to "use integer"    use Math::BigInt::Calc base_len => 4, use_int => 1;    use Math::BigInt lib => 'Calc';

DESCRIPTION

Math::BigInt::Calc inherits from Math::BigInt::Lib.

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 theintermediate computations. The base B elements are stored in an array, with theleast significant element stored in array element zero. There are no leadingzero elements, except a single zero element when the number is zero. Forinstance, 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 defaultis to use this maximum exponent. If the combination of the 'base_len' value andthe '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. Thevalue must be a positive integer.

    use Math::BigInt::Calc base_len => 4;  # use 10000 as internal base

use_int

This option is used to specify whether ``use integer'' should be used in theinternal 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 specifiedtogether with 'use_int', the current value for the base length is used.

    use Math::BigInt::Calc use_int => 1;   # use "use integer" internally

METHODS

This overview constains only the methods that are specific to"Math::BigInt::Calc". For the other methods, see Math::BigInt::Lib.

_base_len()

Specify the desired base length and whether to enable ``use integer'' in thecomputations.

    Math::BigInt::Calc -> _base_len($base_len, $use_int);

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

    use Math::BigInt::Calc base_len => 6, use_int => 1;

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