rint

   Rounds its argument to an integral value according to the current
   IEEE rounding direction specified by the user.

   This function is supported on OpenVMS Integrity servers and
   Alpha only.

   Format

     #include  <math.h>

     double rint  (double x);

     float rintf  (float x,);

     long double rintl  (long double x);
 

Additional information available:

Argument        Description     Return_Values