76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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* Copyright (c) 2021 Li hsilin <lihsilyn@gmail.com>
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*
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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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*
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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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*
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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
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* THE SOFTWARE.
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*/
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#include "ax/u1024.h"
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#include "ut/runner.h"
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#include "ut/suite.h"
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#include <assert.h>
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#include <setjmp.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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void factorial(ax_u1024* n, ax_u1024* res)
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{
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ax_u1024 tmp;
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ax_u1024_assign(&tmp, n);
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ax_u1024_dec(n);
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while (!ax_u1024_is_zero(n)) {
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ax_u1024_mul(&tmp, n, res);
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ax_u1024_dec(n);
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ax_u1024_assign(&tmp, res);
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}
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ax_u1024_assign(res, &tmp);
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}
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static void test_factorial(ut_runner *r)
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{
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char resbuf[512];
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char expect[] =
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"1b30964ec395dc24069528d54bbda40d16e966ef9a70eb21b5b294"
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"3a321cdf10391745570cca9420c6ecb3b72ed2ee8b02ea2735c61a"
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"000000000000000000000000";
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ax_u1024 num = { 0 };
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ax_u1024 res = { 0 };
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ax_u1024_from_int(&num, 100);
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factorial(&num, &res);
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ax_u1024_to_string(&res, resbuf, sizeof resbuf);
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ut_assert(r, strcmp(expect, resbuf) == 0);
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}
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ut_suite *suite_for_u1024()
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{
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ut_suite* suite = ut_suite_create("u1024");
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ut_suite_add(suite, test_factorial, 0);
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return suite;
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}
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