Mercurial > cpython-lru_cache-weakref

annotate Python/fmod.c @ 13658:f79434ee41fa legacy-trunk

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Mass ANSIfication of function definitions. Doesn't cover all 'extern' declarations yet, those come later.
author Thomas Wouters <thomas@python.org>
date Sat, 22 Jul 2000 18:47:25 +0000
parents 87ee82e5c56d
children 59f8cedcf049
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Portable fmod(x, y) implementation for systems that don't have it */
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12
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13 #include "config.h"
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14
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15 #include "mymath.h"
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16 #include <errno.h>
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17
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18 double
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19 fmod(double x, double y)
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20 {
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21 double i, f;
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22
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23 if (y == 0.0) {
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24 errno = EDOM;
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25 return 0.0;
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26 }
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27
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28 /* return f such that x = i*y + f for some integer i
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29 such that |f| < |y| and f has the same sign as x */
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31 i = floor(x/y);
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32 f = x - i*y;
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33 if ((x < 0.0) != (y < 0.0))
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34 f = f-y;
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35 return f;
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36 }