exprqa.c
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:2k
- /* mpq expression evaluation
- Copyright 2000, 2001, 2004 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include "gmp.h"
- #include "expr-impl.h"
- static int
- e_mpq_ulong_p (mpq_srcptr q)
- {
- return mpz_fits_ulong_p (mpq_numref (q))
- && mpz_cmp_ui (mpq_denref (q), 1L) == 0;
- }
- /* get value as a ui, on the assumption it fits */
- static int
- e_mpq_get_ui_fits (mpq_srcptr q)
- {
- return mpz_get_ui (mpq_numref (q));
- }
- static void
- e_mpq_set_si1 (mpq_ptr q, long num)
- {
- mpq_set_si (q, num, 1L);
- }
- /* The same as mpz, but putting the result in the numerator. Negatives and
- fractions aren't parsed here because '-' and '/' are operators. */
- static size_t
- e_mpq_number (mpq_ptr res, __gmp_const char *e, size_t elen, int base)
- {
- mpz_set_ui (mpq_denref (res), 1L);
- return mpexpr_mpz_number (mpq_numref (res), e, elen, base);
- }
- /* ignoring prec */
- static void
- e_mpq_init (mpq_ptr q, unsigned long prec)
- {
- mpq_init (q);
- }
- int
- mpq_expr_a (__gmp_const struct mpexpr_operator_t *table,
- mpq_ptr res, int base,
- __gmp_const char *e, size_t elen,
- mpq_srcptr var[26])
- {
- struct mpexpr_parse_t p;
- p.table = table;
- p.res = (mpX_ptr) res;
- p.base = base;
- p.e = e;
- p.elen = elen;
- p.var = (mpX_srcptr *) var;
- p.mpX_clear = (mpexpr_fun_one_t) mpq_clear;
- p.mpX_ulong_p = (mpexpr_fun_i_unary_t) e_mpq_ulong_p;
- p.mpX_get_ui = (mpexpr_fun_get_ui_t) e_mpq_get_ui_fits;
- p.mpX_init = (mpexpr_fun_unary_ui_t) e_mpq_init;
- p.mpX_number = (mpexpr_fun_number_t) e_mpq_number;
- p.mpX_set = (mpexpr_fun_unary_t) mpq_set;
- p.mpX_set_or_swap = (mpexpr_fun_unary_t) mpq_swap;
- p.mpX_set_si = (mpexpr_fun_set_si_t) e_mpq_set_si1;
- p.mpX_swap = (mpexpr_fun_swap_t) mpq_swap;
- return mpexpr_evaluate (&p);
- }