The last element of an array is foo[-1] regardless of it's length. :-) And try implementing a circular buffer using an array of N elements with 1-based indexi

The last element of an array is foo[-1] regardless of it's length. :-) And try implementing a circular buffer using an array of N elements with 1-based indexing and then 0-based. Sorry in advance for the loss of hair due to the former.