Returns the floating-point remainder r = x - n*y) when y is
    nonzero.

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

    Format

      #include  <math.h>

      double remainder  (double x, double y);

      float remainderf  (float x, float y);

      long double remainderl  (long double x, long double y);

1 - Argument

 x

    A real number.

 y

    A real number.

2 - Description

    These functions return the floating-point remainder r = x - n*y)
    when y is nonzero. The value n is the integral value nearest the
    exact value x/y. That is, n = rint(x/y).

    When |n - x/y| = 1/2, the value n is chosen to be even.

    The behavior of the remainder function is independent of the
    rounding mode.

    The remainder functions are functionally equivalent to the remquo
    functions.

3 - Return Values

    r                  Upon successful completion, these functions
                       return the floating-point remainder r = x - ny
                       when y is nonzero.
    Nan                If x or y is Nan.