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    Command:

    floorl

    
    
    
    

    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)
    
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