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1 perry 1 CEIL
2 !!!CEIL
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 RETURN VALUE
7 ERRORS
8 NOTES
9 CONFORMING TO
10 SEE ALSO
11 ----
12 !!NAME
13
14
15 ceil, ceilf, ceill - ceiling function: smallest integral value not less than argument
16 !!SYNOPSIS
17
18
19 __#include
20 __ ''x''__);
21 float ceilf(float__ ''x''__);
22 long double ceill(long double__ ''x''__);
23 __
24 !!DESCRIPTION
25
26
27 These functions round ''x'' up to the nearest
28 integer.
29 !!RETURN VALUE
30
31
32 The rounded integer value. If ''x'' is integral or
33 infinite, ''x'' itself is returned.
34 !!ERRORS
35
36
37 No errors other than EDOM and ERANGE can occur. If ''x''
38 is NaN, then NaN is returned and ''errno'' may be set to
39 EDOM.
40 !!NOTES
41
42
43 The SUSv2 and Austin draft contain text about overflow
44 (which might set ''errno'' to ERANGE, or raise an
45 exception). In practice, the result cannot overflow on any
46 current machine, so this error-handling stuff is just
47 nonsense. (More precisely, overflow can happen only when the
48 maximum value of the exponent is smaller than the number of
49 mantissa bits. For the IEEE-754 standard 32-bit and 64-bit
50 floating point numbers the maximum value of the exponent is
51 128 (resp. 1024), and the number of mantissa bits is 24
52 (resp. 53).)
53 !!CONFORMING TO
54
55
56 The __ceil()__ function conforms to SVID 3, POSIX, BSD
57 4.3, ISO 9899. The other functions are from
58 C99.
59 !!SEE ALSO
60
61
62 floor(3), lrint(3), nearbyint(3),
63 rint(3), round(3),
64 trunc(3)
65 ----
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