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

       The SUSv2 and Austin draft  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 man­
       tissa 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)


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