Null pointer and pointer arithmetic

Question

Is there a way to stop the while loop below from iterating after surpassing 40? I am trying to replicate the linked list concept of iterating while NULL pointer is not found.

int main() {
    int* arr = new int[4]{ 10,20,30,40 };
    //for(int i=0; i<4; ++i) -- works fine
    while (arr) {
        cout << *(arr++) << endl;
    }
        
    delete[] arr; // Free allocated memory
    return 0;
}

Answer 1

Is there are to stop the while loop below from iterating after surpassing 40

There are two ways to stop the loop: Cause the condition to become false, or jump out of the loop (break, goto, return, throw, etc.). Your loop doesn't do either.

Your condition is arr which is false only if the pointer points to null. You never assign null to arr, so it is never null.

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I am trying to replicate the linked list concept

Linked list concepts do not generally apply to things that aren't linked lists. Arrays are not linked lists.