home *** CD-ROM | disk | FTP | other *** search
- /*
- Copyright (C) 1994 M. Hagiya, W. Schelter, T. Yuasa
-
- This file is part of GNU Common Lisp, herein referred to as GCL
-
- GCL is free software; you can redistribute it and/or modify it under
- the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GCL 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 Library General Public
- License for more details.
-
- You should have received a copy of the GNU Library General Public License
- along with GCL; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- */
-
- /*
- Predicates on numbers
- */
- #include "include.h"
- #include "num_include.h"
- #include "mp.h"
-
- number_zerop(x)
- object x;
- {
- switch (type_of(x)) {
-
- case t_fixnum:
- if (fix(x) == 0)
- return(1);
- else
- return(0);
-
- case t_bignum:
- case t_ratio:
- return(0);
-
- case t_shortfloat:
- if (sf(x) == 0.0)
- return(1);
- else
- return(0);
-
- case t_longfloat:
- if (lf(x) == 0.0)
- return(1);
- else
- return(0);
-
- case t_complex:
- return(number_zerop(x->cmp.cmp_real) &&
- number_zerop(x->cmp.cmp_imag));
-
- default:
- FEwrong_type_argument(Snumber, x);
- }
- }
-
- number_plusp(x)
- object x;
- {
- switch (type_of(x)) {
-
- case t_fixnum:
- if (fix(x) > 0)
- return(1);
- else
- return(0);
-
- case t_bignum:
- if (big_sign(x) > 0)
- return(1);
- else
- return(0);
-
- case t_ratio:
- if (number_plusp(x->rat.rat_num))
- return(1);
- else
- return(0);
-
- case t_shortfloat:
- if (sf(x) > 0.0)
- return(1);
- else
- return(0);
-
- case t_longfloat:
- if (lf(x) > 0.0)
- return(1);
- else
- return(0);
-
- default:
- FEwrong_type_argument(TSor_rational_float);
- }
- }
-
- number_minusp(x)
- object x;
- {
- switch (type_of(x)) {
-
- case t_fixnum:
- if (fix(x) < 0)
- return(1);
- else
- return(0);
-
- case t_bignum:
- if (big_sign(x) < 0)
- return(1);
- else
- return(0);
-
- case t_ratio:
- if (number_minusp(x->rat.rat_num))
- return(1);
- else
- return(0);
-
- case t_shortfloat:
- if (sf(x) < 0.0)
- return(1);
- else
- return(0);
-
- case t_longfloat:
- if (lf(x) < 0.0)
- return(1);
- else
- return(0);
-
- default:
- FEwrong_type_argument(TSor_rational_float);
- }
- }
-
- number_oddp(x)
- object x;
- {
- int i;
-
- if (type_of(x) == t_fixnum)
- i = fix(x);
- else if (type_of(x) == t_bignum)
- i = MP_LOW(MP(x),lgef(MP(x)));
- else
- FEwrong_type_argument(Sinteger, x);
- return(i & 1);
- }
-
- number_evenp(x)
- object x;
- {
- int i;
-
- if (type_of(x) == t_fixnum)
- i = fix(x);
- else if (type_of(x) == t_bignum)
- i = MP_LOW(MP(x),lgef(MP(x)));
- else
- FEwrong_type_argument(Sinteger, x);
- return(~i & 1);
- }
-
- Lzerop()
- {
- check_arg(1);
- check_type_number(&vs_base[0]);
- if (number_zerop(vs_base[0]))
- vs_base[0] = Ct;
- else
- vs_base[0] = Cnil;
- }
-
- Lplusp()
- {
- check_arg(1);
- check_type_or_rational_float(&vs_base[0]);
- if (number_plusp(vs_base[0]))
- vs_base[0] = Ct;
- else
- vs_base[0] = Cnil;
- }
-
- Lminusp()
- {
- check_arg(1);
- check_type_or_rational_float(&vs_base[0]);
- if (number_minusp(vs_base[0]))
- vs_base[0] = Ct;
- else
- vs_base[0] = Cnil;
- }
-
- Loddp()
- {
- check_arg(1);
- check_type_integer(&vs_base[0]);
- if (number_oddp(vs_base[0]))
- vs_base[0] = Ct;
- else
- vs_base[0] = Cnil;
- }
-
- Levenp()
- {
- check_arg(1);
- check_type_integer(&vs_base[0]);
- if (number_evenp(vs_base[0]))
- vs_base[0] = Ct;
- else
- vs_base[0] = Cnil;
- }
-
- init_num_pred()
- {
- big_register_1 = alloc_object(t_bignum);
- ZERO_BIG(big_register_1);
-
- enter_mark_origin(&big_register_1);
- make_function("ZEROP", Lzerop);
- make_function("PLUSP", Lplusp);
- make_function("MINUSP", Lminusp);
- make_function("ODDP", Loddp);
- make_function("EVENP", Levenp);
- }
-