nint() returns the nearest integral value to x, except halfway
    cases are rounded to the integral value larger in magnitude. This
    function corresponds to the Fortran generic intrinsic function
    nint().

                           Entry-Point Names

    Generic                               Compaq
    Function   Data Type   OpenVMS        Tru64 UNIX
    Name       Required    Alpha          Alpha

    nint       S_FLOAT     math$nint_s    nintf
               T_FLOAT     math$nint_t    nint
               X_FLOAT     math$nint_x    nintl
               F_FLOAT     math$nint_f
               G_FLOAT     math$nint_g