ceill man page on Scientific

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```CEIL(3)			   Linux Programmer's Manual		       CEIL(3)

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);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

ceilf(), ceill(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
|| _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION
These  functions	 return	 the  smallest integral value that is not less
than x.

For example, ceil(0.5) is 1.0, and ceil(-0.5) is 0.0.

RETURN VALUE
These functions return the ceiling of x.

If x is integral, +0, -0, NaN, or infinite, x itself is returned.

ERRORS
No errors occur.	 POSIX.1-2001 documents a range error  for  overflows,
but see NOTES.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
4.3BSD, C89.

NOTES
SUSv2 and POSIX.1-2001 contain text about  overflow  (which  might  set
errno  to ERANGE, or raise an FE_OVERFLOW 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  man‐
tissa bits.  For the IEEE-754 standard 32-bit and 64-bit floating-point
numbers the maximum value of the exponent is 128 (respectively,	1024),
and the number of mantissa bits is 24 (respectively, 53).)

The  integral  value  returned  by  these functions may be too large to
store in an integer type (int, long,  etc.).   To  avoid	 an  overflow,
which  will  produce undefined results, an application should perform a
range check on the returned value before assigning  it  to  an  integer
type.

floor(3), lrint(3), nearbyint(3), rint(3), round(3), trunc(3)

COLOPHON
This  page  is  part of release 3.22 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/.

2008-08-05			       CEIL(3)
```
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