1 | /* |
---|
2 | * ==================================================== |
---|
3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
---|
4 | * |
---|
5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
---|
6 | * Permission to use, copy, modify, and distribute this |
---|
7 | * software is freely granted, provided that this notice |
---|
8 | * is preserved. |
---|
9 | * ==================================================== |
---|
10 | */ |
---|
11 | /* |
---|
12 | FUNCTION |
---|
13 | <<nearbyint>>, <<nearbyintf>>---round to integer |
---|
14 | INDEX |
---|
15 | nearbyint |
---|
16 | INDEX |
---|
17 | nearbyintf |
---|
18 | |
---|
19 | SYNOPSIS |
---|
20 | #include <math.h> |
---|
21 | double nearbyint(double <[x]>); |
---|
22 | float nearbyintf(float <[x]>); |
---|
23 | |
---|
24 | DESCRIPTION |
---|
25 | The <<nearbyint>> functions round their argument to an integer value in |
---|
26 | floating-point format, using the current rounding direction and |
---|
27 | (supposedly) without raising the "inexact" floating-point exception. |
---|
28 | See the <<rint>> functions for the same function with the "inexact" |
---|
29 | floating-point exception being raised when appropriate. |
---|
30 | |
---|
31 | BUGS |
---|
32 | Newlib does not support the floating-point exception model, so that |
---|
33 | the floating-point exception control is not present and thereby what may |
---|
34 | be seen will be compiler and hardware dependent in this regard. |
---|
35 | The Newlib <<nearbyint>> functions are identical to the <<rint>> |
---|
36 | functions with respect to the floating-point exception behavior, and |
---|
37 | will cause the "inexact" exception to be raised for most targets. |
---|
38 | |
---|
39 | RETURNS |
---|
40 | <[x]> rounded to an integral value, using the current rounding direction. |
---|
41 | |
---|
42 | PORTABILITY |
---|
43 | ANSI C, POSIX |
---|
44 | |
---|
45 | SEEALSO |
---|
46 | <<rint>>, <<round>> |
---|
47 | */ |
---|
48 | |
---|
49 | #include <math.h> |
---|
50 | #include "fdlibm.h" |
---|
51 | |
---|
52 | #ifndef _DOUBLE_IS_32BITS |
---|
53 | |
---|
54 | #ifdef __STDC__ |
---|
55 | double nearbyint(double x) |
---|
56 | #else |
---|
57 | double nearbyint(x) |
---|
58 | double x; |
---|
59 | #endif |
---|
60 | { |
---|
61 | return rint(x); |
---|
62 | } |
---|
63 | |
---|
64 | #endif /* _DOUBLE_IS_32BITS */ |
---|