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

lround(3M)						  Mathematical Library Functions						lround(3M)

NAME
lround, lroundf, lroundl - round to nearest integer value
SYNOPSIS
cc [ flag... ] file... -lm [ library... ] #include <math.h> long lround(double x); long lroundf(float x); long lroundl(long double x);
DESCRIPTION
These functions round their argument to the nearest integer value, rounding halfway cases away from zero, regardless of the current round- ing direction.
RETURN VALUES
Upon successful completion, these functions return the rounded integer value. If x is NaN, a domain error occurs and an unspecified value is returned. If x is +Inf, a domain error occurs and an unspecified value is returned. If x is -Inf, a domain error occurs and an unspecified value is returned. If the correct value is positive and too large to represent as a long, a domain error occurs and an unspecified value is returned. If the correct value is negative and too large to represent as a long, a domain error occurs and an unspecified value is returned.
ERRORS
These functions will fail if: Domain Error The x argument is NaN or +-Inf, or the correct value is not representable as an integer. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the invalid floating-point exception is raised.
USAGE
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should either examine the return value or check the floating point exception flags to detect exceptions.
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), llround(3M), math.h(3HEAD), attributes(5), standards(5) SunOS 5.10 1 Sep 2002 lround(3M)