Mercurial > cpython-lru_cache-weakref
annotate Python/fmod.c @ 1848:b724599401ff legacy-trunk
Merge back to main trunk
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Tue, 30 Aug 1994 08:27:36 +0000 |
| parents | cd397266dc1c |
| children | d0d0a69b5ca3 |
| rev | line source |
|---|---|
| 145 | 1 /*********************************************************** |
|
1848
b724599401ff
Merge back to main trunk
Guido van Rossum <guido@python.org>
parents:
1319
diff
changeset
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2 Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum, |
|
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1cabc2b6c970
* Changed all copyright messages to include 1993.
Guido van Rossum <guido@python.org>
parents:
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diff
changeset
|
3 Amsterdam, The Netherlands. |
| 145 | 4 |
| 5 All Rights Reserved | |
| 6 | |
| 7 Permission to use, copy, modify, and distribute this software and its | |
| 8 documentation for any purpose and without fee is hereby granted, | |
| 9 provided that the above copyright notice appear in all copies and that | |
| 10 both that copyright notice and this permission notice appear in | |
| 11 supporting documentation, and that the names of Stichting Mathematisch | |
| 12 Centrum or CWI not be used in advertising or publicity pertaining to | |
| 13 distribution of the software without specific, written prior permission. | |
| 14 | |
| 15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO | |
| 16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE | |
| 18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 ******************************************************************/ | |
| 24 | |
| 6 | 25 /* Portable fmod(x, y) implementation for systems that don't have it */ |
| 26 | |
| 27 #include <math.h> | |
| 28 #include <errno.h> | |
| 29 | |
| 30 double | |
| 31 fmod(x, y) | |
| 32 double x, y; | |
| 33 { | |
| 34 double i, f; | |
| 35 | |
| 36 if (y == 0.0) { | |
| 37 errno = EDOM; | |
| 38 return 0.0; | |
| 39 } | |
| 40 | |
| 41 /* return f such that x = i*y + f for some integer i | |
| 42 such that |f| < |y| and f has the same sign as x */ | |
| 43 | |
| 44 i = floor(x/y); | |
| 45 f = x - i*y; | |
| 46 if ((x < 0.0) != (y < 0.0)) | |
| 47 f = f-y; | |
| 48 return f; | |
| 49 } |