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roundf(3) [freebsd man page]

ROUND(3)						   BSD Library Functions Manual 						  ROUND(3)

NAME
round, roundf, roundl -- round to nearest integral value LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double round(double x); float roundf(float x); long double roundl(long double x); DESCRIPTION
The round(), roundf(), and roundl() functions return the nearest integral value to x; if x lies halfway between two integral values, then these functions return the integral value with the larger absolute value (i.e., they round away from zero). SEE ALSO
ceil(3), floor(3), ieee(3), lrint(3), lround(3), math(3), rint(3), trunc(3) STANDARDS
These functions conform to ISO/IEC 9899:1999 (``ISO C99''). HISTORY
The round() and roundf() functions appeared in FreeBSD 5.3. The roundl() function appeared in FreeBSD 6.0. BSD
April 7, 2005 BSD

Check Out this Related Man Page

ROUND(3)						     Linux Programmer's Manual							  ROUND(3)

NAME
round, roundf, roundl - round to nearest integer, away from zero SYNOPSIS
#include <math.h> double round(double x); float roundf(float x); long double roundl(long double x); DESCRIPTION
These functions round x to the nearest integer, but round halfway cases away from zero (regardless of the current rounding direction), instead of to the nearest even integer like rint(). 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
POSIX 1003.1-2001 contains 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
C99. SEE ALSO
ceil(3), floor(3), lround(3), nearbyint(3), rint(3), trunc(3) 2001-05-31 ROUND(3)
Man Page

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