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RedHat 9 (Linux i386) - man page for floorf (redhat section 3)

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

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

SYNOPSIS
       #include <math.h>

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

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.

NOTES
       SUSv2 and POSIX 1003.1-2001 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).)

CONFORMING TO
       The  floor()  function  conforms to SVID 3, POSIX, BSD 4.3, ISO 9899.  The other functions
       are from C99.

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

					    2001-05-31					 FLOOR(3)


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