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FreeBSD 11.0 - man page for lroundf (freebsd section 3)

LROUND(3)						   BSD Library Functions Manual 						 LROUND(3)

NAME
llround, llroundf, llroundl, lround, lroundf, lroundl -- convert to nearest integral value
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> long long llround(double x); long long llroundf(float x); long long llroundl(long double x); long lround(double x); long lroundf(float x); long lroundl(long double x);
DESCRIPTION
The lround() function returns the integer nearest to its argument x, rounding away from zero in halfway cases. If the rounded result is too large to be represented as a long value, an invalid exception is raised and the return value is undefined. Otherwise, if x is not an inte- ger, lround() may raise an inexact exception. When the rounded result is representable as a long, the expression lround(x) is equivalent to (long)round(x) (although the former may be more efficient). The llround(), llroundf(), llroundl(), lroundf() and lroundl() functions differ from lround() only in their input and output types.
SEE ALSO
lrint(3), math(3), rint(3), round(3)
STANDARDS
The llround(), llroundf(), llroundl(), lround(), lroundf(), and lroundl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').
HISTORY
The float and double versions of these routines first appeared in FreeBSD 5.4. The long double versions appeared in FreeBSD 6.0.
BSD
April 7, 2005 BSD