Null pointer - Wikipedia
https://en.wikipedia.org/wiki/Null_pointer
Null pointer. From Wikipedia, the free encyclopedia. Jump to navigation Jump to search. A null pointer should not be confused with an uninitialized pointer: a null pointer is guaranteed to compare...
NULL pointer in C - GeeksforGeeks
https://www.geeksforgeeks.org/few-bytes-on-null-pointer-in-c/
It should be noted that NULL pointer is different from an uninitialized and dangling pointer. In a specific program context, all uninitialized or dangling or NULL pointers are invalid but NULL is a...