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| 2 | /* @(#)w_fmod.c 5.1 93/09/24 */
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| 3 | /*
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| 4 | * ====================================================
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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| 6 | *
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business.
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| 8 | * Permission to use, copy, modify, and distribute this
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| 9 | * software is freely granted, provided that this notice
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| 10 | * is preserved.
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| 11 | * ====================================================
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| 12 | */
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| 13 |
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| 14 | /*
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| 15 | FUNCTION
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| 16 | <<fmod>>, <<fmodf>>---floating-point remainder (modulo)
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| 17 |
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| 18 | INDEX
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| 19 | fmod
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| 20 | INDEX
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| 21 | fmodf
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| 22 |
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| 23 | ANSI_SYNOPSIS
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| 24 | #include <math.h>
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| 25 | double fmod(double <[x]>, double <[y]>)
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| 26 | float fmodf(float <[x]>, float <[y]>)
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| 27 |
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| 28 | TRAD_SYNOPSIS
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| 29 | #include <math.h>
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| 30 | double fmod(<[x]>, <[y]>)
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| 31 | double (<[x]>, <[y]>);
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| 32 |
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| 33 | float fmodf(<[x]>, <[y]>)
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| 34 | float (<[x]>, <[y]>);
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| 35 |
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| 36 | DESCRIPTION
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| 37 | The <<fmod>> and <<fmodf>> functions compute the floating-point
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| 38 | remainder of <[x]>/<[y]> (<[x]> modulo <[y]>).
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| 39 |
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| 40 | RETURNS
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| 41 | The <<fmod>> function returns the value
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| 42 | @ifinfo
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| 43 | <[x]>-<[i]>*<[y]>,
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| 44 | @end ifinfo
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| 45 | @tex
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| 46 | $x-i\times y$,
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| 47 | @end tex
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| 48 | for the largest integer <[i]> such that, if <[y]> is nonzero, the
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| 49 | result has the same sign as <[x]> and magnitude less than the
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| 50 | magnitude of <[y]>.
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| 51 |
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| 52 | <<fmod(<[x]>,0)>> returns NaN, and sets <<errno>> to <<EDOM>>.
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| 53 |
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| 54 | You can modify error treatment for these functions using <<matherr>>.
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| 55 |
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| 56 | PORTABILITY
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| 57 | <<fmod>> is ANSI C. <<fmodf>> is an extension.
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| 58 | */
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| 59 |
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| 60 | /*
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| 61 | * wrapper fmod(x,y)
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| 62 | */
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| 63 |
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| 64 | #include "fdlibm.h"
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| 65 | #include <errno.h>
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| 66 |
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| 67 | #ifndef _DOUBLE_IS_32BITS
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| 68 |
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| 69 | #ifdef __STDC__
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| 70 | double fmod(double x, double y) /* wrapper fmod */
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| 71 | #else
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| 72 | double fmod(x,y) /* wrapper fmod */
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| 73 | double x,y;
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| 74 | #endif
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| 75 | {
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| 76 | #ifdef _IEEE_LIBM
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| 77 | return __ieee754_fmod(x,y);
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| 78 | #else
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| 79 | double z;
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| 80 | struct exception exc;
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| 81 | z = __ieee754_fmod(x,y);
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| 82 | if(_LIB_VERSION == _IEEE_ ||isnan(y)||isnan(x)) return z;
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| 83 | if(y==0.0) {
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| 84 | /* fmod(x,0) */
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| 85 | exc.type = DOMAIN;
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| 86 | exc.name = "fmod";
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| 87 | exc.arg1 = x;
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| 88 | exc.arg2 = y;
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| 89 | exc.err = 0;
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| 90 | if (_LIB_VERSION == _SVID_)
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| 91 | exc.retval = x;
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| 92 | else
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| 93 | exc.retval = 0.0/0.0;
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| 94 | if (_LIB_VERSION == _POSIX_)
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| 95 | errno = EDOM;
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| 96 | else if (!matherr(&exc)) {
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| 97 | errno = EDOM;
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| 98 | }
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| 99 | if (exc.err != 0)
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| 100 | errno = exc.err;
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| 101 | return exc.retval;
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| 102 | } else
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| 103 | return z;
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| 104 | #endif
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| 105 | }
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| 106 |
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| 107 | #endif /* defined(_DOUBLE_IS_32BITS) */
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