What happens if you try to compile and run this program?

1.A function fun is defined that takes a pointer to an integer t and returns t + 4.

2.The main function defines an array arr with the elements { 4, 3, 2, 1, 0 }.

3.It then calls fun with the argument arr - 3. Since arr points to the first element of the array, arr - 3 is actually pointing to 3 positions before the start of the array, which is out of bounds.

4.Inside fun, t + 4 would effectively be arr + 1 (arr - 3 + 4).

5.The returned pointer from fun (which is arr + 1) is assigned to ptr.

6.ptr[2] is then the same as arr[1 + 2], which is arr[3]. The value at arr[3] is 1.