CEIL(L)             Linux Programmer's Manual             CEIL(L)



NAME
       ceil,  ceilf,  ceill - ceiling function: smallest integral
       value not less than argument

SYNOPSIS
       #include <math.h>

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

DESCRIPTION
       These functions round x up 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
       SUSv2 and POSIX 1003.1-2001 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  ceil()  function  conforms to SVID 3, POSIX, BSD 4.3,
       ISO 9899.  The other functions are from C99.

SEE ALSO
       floor(r),  lrint(t),  nearbyint(t),   rint(t),   round(d),
       trunc(c)



                            2001-05-31                    CEIL(L)