ceill man page on Oracle

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CEIL(3P)		   POSIX Programmer's Manual		      CEIL(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       ceil, ceilf, ceill - ceiling value function

       #include <math.h>

       double ceil(double x);
       float ceilf(float x);
       long double ceill(long double x);

       These functions shall compute the smallest integral value not less than

       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

       Upon  successful	 completion, ceil(), ceilf(), and ceill() shall return
       the smallest integral value not less than x, expressed as a  type  dou‐
       ble, float, or long double, respectively.

       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 ceil(), ceilf(), and ceill() shall return the value	of  the	 macro
       HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.

       These functions shall fail if:

       Range Error
	      The result overflows.

       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.


       The integral value returned by these functions need 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

       The ceil() function can only overflow when the floating-point represen‐
       tation 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.



       feclearexcept(), fetestexcept(), floor(), isnan(), the Base Definitions
       volume of IEEE Std 1003.1-2001, Section 4.18, Treatment of Error Condi‐
       tions for Mathematical Functions, <math.h>

       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			      CEIL(3P)

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