FLOOR(3)		   Linux Programmers Manual		     FLOOR(3)



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

SYNOPSIS
       #include 

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

       Link with -lm.

DESCRIPTION
       These functions round x down 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 floor() function conforms to SVr4, 4.3BSD, C89.   The  other  func
       tions 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  can
       not  overflow  on  any current machine, so this error-handling stuff is
       just nonsense.  (More precisely, overflow can happen only when the max
       imum 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 (respectively, 1024), and the num
       ber 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 3.05 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/.



				  2001-05-31			      FLOOR(3)