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

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

       #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; or cc -std=c99

       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.

       These functions return the floor of x.

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

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

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

       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).)

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

       This  page  is  part of release 3.25 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/.

                                  2008-10-06                          FLOOR(3)

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