floor man page on Archlinux

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

NAME
floor,  floorf,	floorl - largest integral value not greater than argu‐
ment

SYNOPSIS
#include <math.h>

double floor(double x);
float floorf(float x);
long double floorl(long double x);

Link with -lm.

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

floorf(), floorl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION
These  functions	 return the largest integral value that is not greater
than x.

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

RETURN VALUE
These functions return the floor of x.

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

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

ATTRIBUTES
Multithreading (see pthreads(7))
The floor(), floorf(), and floorl() functions are thread-safe.

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).)

SEE ALSO
ceil(3), lrint(3), nearbyint(3), rint(3), round(3), trunc(3)

COLOPHON
This  page  is  part of release 3.65 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/.

2013-07-23			      FLOOR(3)
```
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