Write a function, insertAt, that takes four parameters: an array of integers, the number of elements in the array, an integer (say, insertItem), and an integer (say, index). The function should insert insertItem in the array at the position specified by index. If index is out of range, output an appropriate message. (Note that index must be between 0 and the number of elements in the array; that is, 0 <= index < the number of elements in the array.) Assume that the array is unsorted.
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