Command:

CEIL(3) Linux Programmer's Manual CEIL(3)NAMEceil, ceilf, ceill - ceiling function: smallest integral value not less than argumentSYNOPSIS#include<math.h>doubleceil(doublex);floatceilf(floatx);longdoubleceill(longdoublex);Link with-lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)):ceilf(),ceill(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; orcc-std=c99DESCRIPTIONThese functions return the smallest integral value that is not less thanx. For example,ceil(0.5)is 1.0, andceil(-0.5)is 0.0.RETURNVALUEThese functions return the ceiling ofx. Ifxis integral, +0, -0, NaN, or infinite,xitself is returned.ERRORSNo errors occur. POSIX.1-2001 documents a range error for overflows, but see NOTES.CONFORMINGTOC99, POSIX.1-2001. The variant returningdoublealso conforms to SVr4, 4.3BSD, C89.NOTESSUSv2 and POSIX.1-2001 contain text about overflow (which might seterrnotoERANGE, or raise anFE_OVERFLOWexception). 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 mantissa bits. For the IEEE-754 standard 32-bit and 64-bit floating-point numbers the maxi- mum value of the exponent is 128 (respectively, 1024), and the number of mantissa bits is 24 (respectively, 53).) The integral value returned by these functions may be too large to store in an integer type (int,long, etc.). To avoid an overflow, which will produce undefined results, an application should perform a range check on the returned value before assigning it to an integer type.SEEALSOfloor(3), lrint(3), nearbyint(3), rint(3), round(3), trunc(3)COLOPHONThis page is part of release 3.22 of the Linuxman-pagesproject. A description of the project, and informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2008-08-05 CEIL(3)