67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*
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Name: findprime.c
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Purpose: Find probable primes.
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Author: M. J. Fromberger
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Copyright (C) 2002-2008 Michael J. Fromberger, All Rights Reserved.
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Notes:
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Find the first prime number in sequence starting from the given value.
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Demonstrates the use of mp_int_find_prime().
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include <stdio.h>
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#include "iprime.h"
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int main(int argc, char *argv[]) {
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char buf[4096];
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mpz_t seed;
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mp_result res;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s <start-value>\n", argv[0]);
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return 1;
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}
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mp_int_init(&seed);
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if ((res = mp_int_read_string(&seed, 10, argv[1])) != MP_OK) {
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fprintf(stderr, "%s: error reading `%s': %d\n", argv[0], argv[1], res);
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return 2;
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}
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if (mp_int_compare_value(&seed, 131) <= 0) {
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fprintf(stderr, "%s: please enter a start value > 131\n", argv[0]);
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return 1;
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}
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if ((res = mp_int_find_prime(&seed)) != MP_TRUE) {
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fprintf(stderr, "%s: error finding prime: %d\n", argv[0], res);
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return 2;
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}
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mp_int_to_string(&seed, 10, buf, sizeof(buf));
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printf("=> %s\n", buf);
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mp_int_clear(&seed);
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return 0;
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}
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