int_p.c
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上传日期:2022-08-06
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- /* mpf_integer_p -- test whether an mpf is an integer */
- /*
- Copyright 2001, 2002 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 "gmp.h"
- #include "gmp-impl.h"
- int
- mpf_integer_p (mpf_srcptr f)
- {
- mp_srcptr ptr;
- mp_exp_t exp;
- mp_size_t size, frac, i;
- size = SIZ (f);
- if (size == 0)
- return 1; /* zero is an integer */
- exp = EXP (f);
- if (exp <= 0)
- return 0; /* has only fraction limbs */
- /* any fraction limbs must be zero */
- frac = ABS (size) - exp;
- ptr = PTR (f);
- for (i = 0; i < frac; i++)
- if (ptr[i] != 0)
- return 0;
- return 1;
- }