C++ rotate array to the right by 1

// REQUIRES: there are at least n elements in arr; // n >= 1 // MODIFIES: the elements in arr // EFFECTS: All elements are "shifted" right by one unit, with the // last element wrapping around to the beginning. // EXAMPLE: If arr contains [0,1,3,3,4], it would be modified to // contain [4,0,1,3,3] // NOTE: You must use traversal by pointer. // You may not use an extra array. void slideRight(int arr[], int n) {

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I am really confused about how to do this using pointers? Can anyone give me some suggestions?