The remquo(), remquof(),  and remquol() functions compute
    the same remainder as the remainder(), remainderf(),  and
    remainderl() functions, respectively. In the object pointed to
    by quo, they store a value whose sign is the sign of x/y and
    whose magnitude is congruent modulo 2n to the magnitude of the
    integral quotient of x/y, where n is an implementation-defined
    integer greater than or equal to 3.

    The remquo functions are functionally equivalent to the remainder
    functions.