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CEIL !!!CEIL NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS NOTES CONFORMING TO SEE ALSO ---- !!NAME ceil, ceilf, ceill - ceiling function: smallest integral value not less than argument !!SYNOPSIS __#include __ ''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 The SUSv2 and Austin draft 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 mantissa 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(3), lrint(3), nearbyint(3), rint(3), round(3), trunc(3) ----
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