Bigger Numbers
The standard Math::BigInt, Math::BigRat, and Math::BigFloat modules, along with the bignum , bigint , and bigrat pragmas, provide variable-precision arithmetic and overloaded operators, although they're currently pretty slow. At the cost of some space and considerable speed, they avoid the normal pitfalls associated with limited-precision representations.
1 2 3 4 5 | use 5.010;use bigint; # easy interface to Math::BigInt$x = 123456789123456789;say $x * $x; +15241578780673678515622620750190521 |
Or with rationals:
1 2 3 4 5 6 7 8 | use 5.010;use bigrat;$x = 3/22;$y = 4/6;say "x/y is ", $x/$y;say "x*y is ", $x*$y;x/y is 9/44 x*y is 1/11 |
Several modules let you calculate with unlimited or fixed precision (bound only by memory and CPU time). There are also some non-standard modules that provide faster implementations via external C libraries.
Here is a short, but incomplete summary:
1 2 3 4 5 6 7 8 9 10 11 12 13 | Math::String treat string sequences like numbersMath::FixedPrecision calculate with a fixed precisionMath::Currency for currency calculationsBit::Vector manipulate bit vectors fast (uses C)Math::BigIntFast Bit::Vector wrapper for big numbersMath::Pari provides access to the Pari C libraryMath::Cephes uses the external Cephes C library (no big numbers)Math::Cephes::Fraction fractions via the Cephes libraryMath::GMP another one using an external C libraryMath::GMPz an alternative interface to libgmp's big intsMath::GMPq an interface to libgmp's fraction numbersMath::GMPf an interface to libgmp's floating point numbers |
Choose wisely.
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