Pointer Arithmetic Array Walk

Write a program that processes arrays using only pointer arithmetic - no array indexing allowed.

Requirements: Implement these functions:

• sum_array(const int* arr, size_t n)
• max_array(const int* arr, size_t n)
• reverse_array(int* arr, size_t n)
• count_occurrences(const int* arr, size_t n, int target)

Constraints:

• NO array indexing: arr[i] is forbidden
• NO array subscript operator: * and ++ only
• Must use pointer comparison: ptr < end
• Must use pointer increment/decrement