git.distorted.org.uk Git - u/mdw/catacomb/blob - factorial.c

   1 /* -*-c-*-
   2  *
   3  * $Id: factorial.c,v 1.1 2000/07/09 21:30:49 mdw Exp $
   4  *
   5  * Example factorial computation
   6  *
   7  * (c) 2000 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: factorial.c,v $
  33  * Revision 1.1  2000/07/09 21:30:49  mdw
  34  * Demo program to compute factorials.
  35  *
  36  */
  37
  38 /*----- Header files ------------------------------------------------------*/
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42
  43 #include <mLib/quis.h>
  44 #include <mLib/report.h>
  45
  46 #include "mpmul.h"
  47
  48 /*----- Main code ---------------------------------------------------------*/
  49
  50 int main(int argc, char *argv[])
  51 {
  52   unsigned long x;
  53   char *p;
  54   mp *f;
  55
  56   ego(argv[0]);
  57
  58   if (argc != 2) {
  59     pquis(stderr, "Usage: $ integer\n");
  60     exit(EXIT_FAILURE);
  61   }
  62   x = strtoul(argv[1], &p, 0);
  63   if (*p)
  64     die(EXIT_FAILURE, "bad integer `%s'", argv[1]);
  65   f = mp_factorial(x);
  66   mp_writefile(f, stdout, 10);
  67   fputc('\n', stdout);
  68   mp_drop(f);
  69   return (0);
  70 }
  71
  72 /*----- That's all, folks -------------------------------------------------*/