freebsd man page for rint

RINT(3) 						   BSD Library Functions Manual 						   RINT(3)

NAME
     nearbyint, nearbyintf, nearbyintl, rint, rintf, rintl -- round to integral value in floating-point format

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     nearbyint(double x);

     float
     nearbyintf(float x);

     long double
     nearbyintl(long double x);

     double
     rint(double x);

     float
     rintf(float x);

     long double
     rintl(long double x);

DESCRIPTION
     The rint(), rintf(), and rintl() functions return the integral value nearest to x according to the prevailing rounding mode.  These functions
     raise an inexact exception when the original argument is not an exact integer.

     The nearbyint(), nearbyintf(), and nearbyintl() functions perform the same operation, except that they do not raise an inexact exception.

SEE ALSO
     abs(3), ceil(3), fabs(3), fenv(3), floor(3), ieee(3), lrint(3), lround(3), math(3), round(3)

STANDARDS
     These functions conform to ISO/IEC 9899:1999 (``ISO C99'').

HISTORY
     A rint() function appeared in Version 6 AT&T UNIX.  The nearbyint() and nearbyintf() functions appeared in FreeBSD 5.3, and the long double
     variants were first available in FreeBSD 8.0.

BSD
								 January 13, 2008							       BSD