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 remquo  (double x, double y, int * quo);

      float remquof  (float x, float y, int * quo);

      long double remquol  (long double x, long double y, int * quo);