GMP Basics
**********
All declarations needed to use GMP are collected in the include file
`gmp.h'. It is designed to work with both C and C++ compilers.
#include <gmp.h>
Note however that prototypes for GMP functions with `FILE *'
parameters are only provided if `<stdio.h>' is included too.
#include <stdio.h>
#include <gmp.h>
*Using functions, macros, data types, etc. not documented in this
manual is strongly discouraged. If you do so your application is
guaranteed to be incompatible with future versions of GMP.*