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CEIL
Section: Linux Programmer's Manual (3)
Updated: 2001-05-31
Index
Return to Main Contents
NAME
ceil, ceilf, ceill - ceiling function: smallest integral value not
less than argument
SYNOPSIS
#include <math.h>
double ceil(double x);
float ceilf(float x);
long double ceill(long double x);
Link with -lm.
DESCRIPTION
These functions round x up to the nearest integer.
RETURN VALUE
The rounded integer value.
If x is integral or infinite,
x itself is returned.
ERRORS
No errors other than
EDOM
and
ERANGE
can occur.
If x is NaN, then NaN is returned and
errno
may be set to
EDOM.
CONFORMING TO
The
ceil()
function conforms to SVr4, POSIX.1-2001, 4.3BSD, C89, C99.
The other functions are from C99.
NOTES
SUSv2 and POSIX.1-2001 contain text about overflow (which might set
errno
to
ERANGE,
or raise an exception).
In practice, the result cannot overflow on any current machine,
so this error-handling stuff is just nonsense.
(More precisely, overflow can happen only when the maximum value
of the exponent is smaller than the number of mantissa bits.
For the IEEE-754 standard 32-bit and 64-bit floating point numbers
the maximum value of the exponent is 128 (resp. 1024), and the number
of mantissa bits is 24 (resp. 53).)
SEE ALSO
floor(3),
lrint(3),
nearbyint(3),
rint(3),
round(3),
trunc(3)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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