tYSR20

380Part VI: The Part of Tensclass Array{public:Array(int s){size = 0;pData = new int[s];if (pData){size = s;}}~Array(){delete pData;size = 0;pData = 0;}//either return or set the array dataint data(int index){return pData[index];}int data(int index, int newValue){int oldValue = pData[index];pData[index] = newValue;return oldValue;}protected:int size;int *pData;};The function data(int) allows the application software to read data out ofArray. This function is too trusting; it assumes that the index provided iswithin the data range. What if the index is not? The function data(int,int) is even worse because it overwrites an unknown location.What’s needed is a check to make sure that the index is in range. In the following,only the data(int) function is shown for brevity:int data(unsigned int index){if (index >= size){throw Exception(“Array index out of range”);}return pData[index];}