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.