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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: factorial.c,v 1.2 2001/06/16 13:22:59 mdw Exp $ |
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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 $ |
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33 | * Revision 1.2 2001/06/16 13:22:59 mdw |
34 | * Added command-line option to select output radix. |
35 | * |
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36 | * Revision 1.1 2000/07/09 21:30:49 mdw |
37 | * Demo program to compute factorials. |
38 | * |
39 | */ |
40 | |
41 | /*----- Header files ------------------------------------------------------*/ |
42 | |
43 | #include <stdio.h> |
44 | #include <stdlib.h> |
45 | |
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46 | #include <mLib/mdwopt.h> |
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47 | #include <mLib/quis.h> |
48 | #include <mLib/report.h> |
49 | |
50 | #include "mpmul.h" |
51 | |
52 | /*----- Main code ---------------------------------------------------------*/ |
53 | |
54 | int main(int argc, char *argv[]) |
55 | { |
56 | unsigned long x; |
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57 | int r = 10; |
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58 | char *p; |
59 | mp *f; |
60 | |
61 | ego(argv[0]); |
62 | |
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63 | for (;;) { |
64 | static const struct option opt[] = { |
65 | { "radix", OPTF_ARGREQ, 0, 'r' }, |
66 | { 0, 0, 0, 0 } |
67 | }; |
68 | int i = mdwopt(argc, argv, "r:", opt, 0, 0, 0); |
69 | if (i < 0) |
70 | break; |
71 | switch (i) { |
72 | case 'r': |
73 | r = atoi(optarg); |
74 | if (r < 2 || r > 36) |
75 | die(EXIT_FAILURE, "bad radix `%s'", optarg); |
76 | break; |
77 | default: |
78 | exit(EXIT_FAILURE); |
79 | } |
80 | } |
81 | |
82 | if (optind + 1 != argc) { |
83 | pquis(stderr, "Usage: $ [-r radix] integer\n"); |
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84 | exit(EXIT_FAILURE); |
85 | } |
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86 | x = strtoul(argv[optind], &p, 0); |
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87 | if (*p) |
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88 | die(EXIT_FAILURE, "bad integer `%s'", argv[optind]); |
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89 | f = mp_factorial(x); |
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90 | mp_writefile(f, stdout, r); |
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91 | fputc('\n', stdout); |
92 | mp_drop(f); |
93 | return (0); |
94 | } |
95 | |
96 | /*----- That's all, folks -------------------------------------------------*/ |