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SunOS 5.10 - man page for ceil (sunos section 3m)

ceil(3M)						  Mathematical Library Functions						  ceil(3M)

NAME
ceil, ceilf, ceill - ceiling value function
SYNOPSIS
cc [ flag... ] file... -lm [ library... ] #include <math.h> double ceil(double x); float ceilf(float x); long double ceill(long double x);
DESCRIPTION
These functions compute the smallest integral value not less than x.
RETURN VALUES
Upon successful completion, the ceil(), ceilf(), and ceill() functions return the smallest integral value not less than x, expressed as a type double, float, or long double, respectively. If x is NaN, a NaN is returned. If x is +-0 or +-Inf, x is returned.
USAGE
The integral value returned by these functions need not be expressible as an int or long int. The return value should be tested before assigning it to an integer type to avoid the undefined results of an integer overflow.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+
SEE ALSO
feclearexcept(3M), fetestexcept(3M), floor(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.10 1 Nov 2003 ceil(3M)

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