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FLOOR(P)		   POSIX Programmer's Manual		      FLOOR(P)

NAME
       floor, floorf, floorl - floor function

SYNOPSIS
       #include <math.h>

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

DESCRIPTION
       These  functions	 shall	compute the largest integral value not greater
       than x.

       An application wishing to check for error situations should  set	 errno
       to  zero	 and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
       functions.  On return, if errno is non-zero or  fetestexcept(FE_INVALID
       |  FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has
       occurred.

RETURN VALUE
       Upon successful completion, these functions shall  return  the  largest
       integral	 value	not  greater  than x, expressed as a double, float, or
       long double, as appropriate for the return type of the function.

       If x is NaN, a NaN shall be returned.

       If x is ±0 or ±Inf, x shall be returned.

       If the correct value would cause overflow, a range  error  shall	 occur
       and floor(), floorf(), and floorl() shall return the value of the macro
       -HUGE_VAL, -HUGE_VALF, and -HUGE_VALL, respectively.

ERRORS
       These functions shall fail if:

       Range Error
	      The result would cause an overflow.

       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
       then  errno  shall  be  set  to	[ERANGE].  If  the  integer expression
       (math_errhandling & MATH_ERREXCEPT)  is	non-zero,  then	 the  overflow
       floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The integral value returned by these functions might not be expressible
       as an int or long. The return value should be tested  before  assigning
       it  to  an  integer  type  to avoid the undefined results of an integer
       overflow.

       The floor() function can only overflow when the	floating-point	repre‐
       sentation has DBL_MANT_DIG > DBL_MAX_EXP.

       On   error,   the   expressions	(math_errhandling  &  MATH_ERRNO)  and
       (math_errhandling & MATH_ERREXCEPT) are independent of each other,  but
       at least one of them must be non-zero.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       ceil()  , feclearexcept() , fetestexcept() , isnan() , the Base Defini‐
       tions volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of	 Error
       Conditions for Mathematical Functions, <math.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			      FLOOR(P)
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