lap.c
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:3k
- /*
- * lap.c
- *
- * Find least annihilating power of a mod m
- *
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the MPI Arbitrary Precision Integer Arithmetic
- * library.
- *
- * The Initial Developer of the Original Code is Michael J. Fromberger.
- * Portions created by Michael J. Fromberger are
- * Copyright (C) 1998, 1999, 2000 Michael J. Fromberger.
- * All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the GPL.
- *
- * $Id: lap.c,v 1.1 2000/07/14 00:44:58 nelsonb%netscape.com Exp $
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <signal.h>
- #include "mpi.h"
- void sig_catch(int ign);
- int g_quit = 0;
- int main(int argc, char *argv[])
- {
- mp_int a, m, p, k;
- if(argc < 3) {
- fprintf(stderr, "Usage: %s <a> <m>n", argv[0]);
- return 1;
- }
- mp_init(&a);
- mp_init(&m);
- mp_init(&p);
- mp_add_d(&p, 1, &p);
- mp_read_radix(&a, argv[1], 10);
- mp_read_radix(&m, argv[2], 10);
- mp_init_copy(&k, &a);
- signal(SIGINT, sig_catch);
- signal(SIGHUP, sig_catch);
- signal(SIGTERM, sig_catch);
- while(mp_cmp(&p, &m) < 0) {
- if(g_quit) {
- int len;
- char *buf;
- len = mp_radix_size(&p, 10);
- buf = malloc(len);
- mp_toradix(&p, buf, 10);
-
- fprintf(stderr, "Terminated at: %sn", buf);
- free(buf);
- return 1;
- }
- if(mp_cmp_d(&k, 1) == 0) {
- int len;
- char *buf;
- len = mp_radix_size(&p, 10);
- buf = malloc(len);
- mp_toradix(&p, buf, 10);
- printf("%sn", buf);
- free(buf);
- break;
- }
- mp_mulmod(&k, &a, &m, &k);
- mp_add_d(&p, 1, &p);
- }
- if(mp_cmp(&p, &m) >= 0)
- printf("No annihilating power.n");
- mp_clear(&p);
- mp_clear(&m);
- mp_clear(&a);
- return 0;
- }
- void sig_catch(int ign)
- {
- g_quit = 1;
- }