Returns the floating point remainder of dividing the dividend
(num1) by the divisor (num2).
The remainder (r) is defined as: num1 = i * num2 + r, for
some integer i. If num2 is
non-zero, r has the same sign as
num1 and a magnitude less than the magnitude of
num2.
Parameters
num1
The dividend
num2
The divisor
Return Values
The floating point remainder of
num1/num2.
NAN (float) if the second argument is 0.