c - Difference between uninitialized and null pointer

Question

Is there any difference between null pointer and uninitialized pointer? This question was asked in one of the interviews. Could you please explain the difference that they have?

Answer 1

Well, the difference is exactly that. Null pointer is initialized to null, and as such has defined meaning. You can check it for null, and dereferencing it will (on all platforms I know) cause a program to crash with meaningful diagnostics. You can also use null pointers in some specific hacks. Unitinialized pointers, on the other hand, are just random and should be avoided.