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                         THE GNU MP LIBRARY                          THE GNU MP LIBRARY
   
   
 GNU MP is a library for arbitrary precision arithmetic, operating on signed  GNU MP is a library for arbitrary precision arithmetic, operating on signed
 integers, rational numbers, and floating point numbers.  It has a rich set  integers, rational numbers, and floating point numbers.  It has a rich set of
 of functions, and the functions have a regular interface.  functions, and the functions have a regular interface.
   
 GNU MP is designed to be as fast as possible, both for small operands and for  GNU MP is designed to be as fast as possible, both for small operands and huge
 huge operands.  The speed is achieved by using fullwords as the basic  operands.  The speed is achieved by using fullwords as the basic arithmetic
 arithmetic type, by using fast algorithms, by carefully optimized assembly  type, by using fast algorithms, with carefully optimized assembly code for the
 code for the most common inner loops for a lots of CPUs, and by a general  most common inner loops for lots of CPUs, and by a general emphasis on speed
 emphasis on speed (instead of simplicity or elegance).  (instead of simplicity or elegance).
   
 The speed of GNU MP is believed to be faster than any other similar library.  GNU MP is believed to be faster than any other similar library.  Its advantage
 The advantage for GNU MP increases with the operand sizes for certain  increases with operand sizes for certain operations, since GNU MP in many
 operations, since GNU MP in many cases has asymptotically faster algorithms.  cases has asymptotically faster algorithms.
   
   GNU MP is free software and may be freely copied on the terms contained in the
   files COPYING.LIB and COPYING (most of GNU MP is under the former, some under
   the latter).
   
                         GETTING STARTED  
   
 First, you have to configure and compiler GNU MP.  Simply typing  
   
         ./configure; make  
   
 will normally do a reasonable job, but will not give optimal library  
 execution speed.  So unless you're very unpatient, please read the detailed  
 instructions in the file INSTALL or in gmp.texi.  
   
 Once you have compiled the library, you should write some small example, and  
 make sure you can compile them.  A typical compilation command is this:  
   
         gcc -g your-file.c -I<gmp-source-dir> <gmp-bin-dir>libgmp.a -lm  
   
 If you have installed the library, you can simply do:  
   
         gcc -g your-file.c -lgmp -lm  
   
 The -lm is normally not needed, since only a few functions in GNU MP use the  
 math library.  
   
 Here is a sample program that declares 2 variables, initializes them as  
 required, and sets one of them from a signed integer, and the other from a  
 string of digits.  It then prints the product of the two numbers in base 10.  
   
   #include <stdio.h>  
   #include "gmp.h"  
   
   main ()  
   {  
     mpz_t a, b, p;  
   
     mpz_init (a);                       /* initialize variables */  
     mpz_init (b);  
     mpz_init (p);  
   
     mpz_set_si (a, 756839);             /* assign variables */  
     mpz_set_str (b, "314159265358979323846", 0);  
     mpz_mul (p, a, b);                  /* generate product */  
     mpz_out_str (stdout, 10, p);        /* print number without newline */  
     puts ("");                          /* print newline */  
   
     mpz_clear (a);                      /* clear out variables */  
     mpz_clear (b);  
     mpz_clear (p);  
   
     exit (0);  
   }  
   
 This might look tedious, with all initializing and clearing.  Fortunately  
 some of these operations can be combined, and other operations can often be  
 avoided.  The example above would be written differently by an experienced  
 GNU MP user:  
   
   #include <stdio.h>  
   #include "gmp.h"  
   
   main ()  
   {  
     mpz_t b, p;  
   
     mpz_init (p);  
   
     mpz_init_set_str (b, "314159265358979323846", 0);  
     mpz_mul_ui (p, b, 756839);          /* generate product */  
     mpz_out_str (stdout, 10, p);        /* print number without newline */  
     puts ("");                          /* print newline */  
   
     exit (0);  
   }  
   
   
                         OVERVIEW OF GNU MP                          OVERVIEW OF GNU MP
   
 There are five classes of functions in GNU MP.  There are five classes of functions in GNU MP.
   
  1. Signed integer arithmetic functions, mpz_*.  These functions are intended   1. Signed integer arithmetic functions (mpz).  These functions are intended
     to be easy to use, with their regular interface.  The associated type is      to be easy to use, with their regular interface.  The associated type is
     `mpz_t'.      `mpz_t'.
   
  2. Rational arithmetic functions, mpq_*.  For now, just a small set of   2. Rational arithmetic functions (mpq).  For now, just a small set of
     functions necessary for basic rational arithmetics.  The associated type      functions necessary for basic rational arithmetics.  The associated type
     is `mpq_t'.      is `mpq_t'.
   
  3. Floating-point arithmetic functions, mpf_*.  If the C type `double'   3. Floating-point arithmetic functions (mpf).  If the C type `double'
     doesn't give enough precision for your application, declare your      doesn't give enough precision for your application, declare your
     variables as `mpf_t' instead, set the precision to any number desired,      variables as `mpf_t' instead, set the precision to any number desired,
     and call the functions in the mpf class for the arithmetic operations.      and call the functions in the mpf class for the arithmetic operations.
   
  4. Positive-integer, hard-to-use, very low overhead functions are in the   4. Positive-integer, hard-to-use, very low overhead functions are in the
     mpn_* class.  No memory management is performed.  The caller must ensure      mpn class.  No memory management is performed.  The caller must ensure
     enough space is available for the results.  The set of functions is not      enough space is available for the results.  The set of functions is not
     regular, nor is the calling interface.  These functions accept input      regular, nor is the calling interface.  These functions accept input
     arguments in the form of pairs consisting of a pointer to the least      arguments in the form of pairs consisting of a pointer to the least
     significant word, and a integral size telling how many limbs (= words)      significant word, and an integral size telling how many limbs (= words)
     the pointer points to.      the pointer points to.
   
     Almost all calculations, in the entire package, are made by calling these      Almost all calculations, in the entire package, are made by calling these
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Line 61  printed.  How to do that, as well how to build the lib
 the INSTALL file in this directory.  the INSTALL file in this directory.
   
   
   
                         REPORTING BUGS                          REPORTING BUGS
   
 If you find a bug in the library, please make sure to tell us about it!  If you find a bug in the library, please make sure to tell us about it!
   
 Report bugs and propose modifications and enhancements to  You should first check the GNU MP web pages at http://www.swox.com/gmp/,
 bug-gmp@prep.ai.mit.edu.  What information is needed in a good bug report is  under "Status of the current release".  There will be patches for all known
 described in the manual.  serious bugs there.
   
   Report bugs to bug-gmp@gnu.org.  What information is needed in a good bug
   report is described in the manual.  The same address can be used for
   suggesting modifications and enhancements.
   
   
   
   
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