opensolaris man page for rint

rint(3M)						  Mathematical Library Functions						  rint(3M)

NAME
       rint, rintf, rintl - round-to-nearest integral value

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double rint(double x);

       float rintf(float x);

       long double rintl(long double x);

DESCRIPTION
       These functions return the integral value (represented as a double) nearest x in the direction of the current rounding mode.

       If the current rounding mode rounds toward negative infinity, rint() is equivalent to floor(3M). If the current rounding mode rounds toward
       positive infinity, rint() is equivalent to ceil(3M).

       These functions differ from the nearbyint(3M), nearbyintf(), and nearbyintl() functions only in that they might raise the inexact floating-
       point exception if the result differs in value from the argument.

RETURN VALUES
       Upon successful completion, these functions return the integer (represented as a double precision number) nearest x in the direction of the
       current rounding mode.

       If x is NaN, a NaN is returned.

       If x is +-0 or +-Inf, x is returned.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       abs(3C), ceil(3M), feclearexcept(3M), fetestexcept(3M), floor(3M), isnan(3M), math.h(3HEAD), nearbyint(3M), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							  rint(3M)