Last change
on this file since 466 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.4 KB
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Rev | Line | |
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[444] | 1 | |
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| 2 | /* @(#)z_floor.c 1.0 98/08/13 */ |
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| 3 | |
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| 4 | /* |
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| 5 | FUNCTION |
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| 6 | <<floor>>, <<floorf>>, <<ceil>>, <<ceilf>>---floor and ceiling |
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| 7 | INDEX |
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| 8 | floor |
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| 9 | INDEX |
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| 10 | floorf |
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| 11 | INDEX |
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| 12 | ceil |
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| 13 | INDEX |
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| 14 | ceilf |
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| 15 | |
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| 16 | SYNOPSIS |
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| 17 | #include <math.h> |
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| 18 | double floor(double <[x]>); |
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| 19 | float floorf(float <[x]>); |
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| 20 | double ceil(double <[x]>); |
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| 21 | float ceilf(float <[x]>); |
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| 22 | |
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| 23 | DESCRIPTION |
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| 24 | <<floor>> and <<floorf>> find |
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| 25 | @tex |
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| 26 | $\lfloor x \rfloor$, |
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| 27 | @end tex |
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| 28 | the nearest integer less than or equal to <[x]>. |
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| 29 | <<ceil>> and <<ceilf>> find |
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| 30 | @tex |
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| 31 | $\lceil x\rceil$, |
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| 32 | @end tex |
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| 33 | the nearest integer greater than or equal to <[x]>. |
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| 34 | |
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| 35 | RETURNS |
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| 36 | <<floor>> and <<ceil>> return the integer result as a double. |
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| 37 | <<floorf>> and <<ceilf>> return the integer result as a float. |
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| 38 | |
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| 39 | PORTABILITY |
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| 40 | <<floor>> and <<ceil>> are ANSI. |
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| 41 | <<floorf>> and <<ceilf>> are extensions. |
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| 42 | |
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| 43 | */ |
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| 44 | |
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| 45 | /***************************************************************** |
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| 46 | * floor |
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| 47 | * |
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| 48 | * Input: |
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| 49 | * x - floating point value |
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| 50 | * |
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| 51 | * Output: |
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| 52 | * Smallest integer less than x. |
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| 53 | * |
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| 54 | * Description: |
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| 55 | * This routine returns the smallest integer less than x. |
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| 56 | * |
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| 57 | *****************************************************************/ |
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| 58 | |
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| 59 | #include "fdlibm.h" |
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| 60 | #include "zmath.h" |
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| 61 | |
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| 62 | #ifndef _DOUBLE_IS_32BITS |
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| 63 | |
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| 64 | double |
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| 65 | floor (double x) |
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| 66 | { |
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| 67 | double f, y; |
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| 68 | |
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| 69 | if (x > -1.0 && x < 1.0) |
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| 70 | return (x >= 0 ? 0 : -1.0); |
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| 71 | |
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| 72 | y = modf (x, &f); |
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| 73 | |
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| 74 | if (y == 0.0) |
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| 75 | return (x); |
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| 76 | |
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| 77 | return (x >= 0 ? f : f - 1.0); |
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| 78 | } |
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| 79 | |
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| 80 | #endif /* _DOUBLE_IS_32BITS */ |
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