The GNU Multiple-Precision Library (GMP) is a mature, free library for arbitrary-precision arithmetic with support for big signed integers, rational numbers, and floating point numbers. The basic interface is for C but wrappers exist for other languages including Ada, C++, C#, OCaml, Perl, PHP, and Python. It is distributed under the GNU LGPL and is used for cryptography applications and in computer algebra systems such as Mathematica and Maple.
GMP, or GNU Multiple Precision Arithmetic Library, is a library allowing for arbitrary precision arithmetic. This means that calculations using the libraries internal variables are not limited to ordinary constraints of bit-level precision that many languages inherently possess.
It can support multiple different data types including floating-point numbers, signed integers and rational numbers. It is primarily used in areas related to cryptography, and is also heavily used in numerical research, other types of security applications and computational algebra.
Full words are used as the intrinsic data type, and logic is used to select separate algorithms depending upon the operand size for efficiency purposes. Critical parts of the library utilize Assembly code and is specialized for different processing units to further increase efficiency.
GMP is designed to run on systems running Unix derivates including Linux and Solaris, but may also work on 32-bit and 64-bit Windows machines.
The manual and information to get started using GMP are located here :
