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Pointer and array data structure in C++

Let us say that ip is a pointer pointing to an item in an integer array. Which of the following expressions point to the valid items within the array? ip[-2] or ip[2]? Why?

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The index of an array must be non-negative integer. So:

ip[-2] is ...

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Pointer to an array is investigated. The response was rated '5/5' by the student who posted the question originally.