Question

As per my knowledge, all occurrences of NULL in code are replaced by a 0 during the preprocessing stage. Then during compilation, all occurrences of 0 in pointer context are replaced by an appropriate value which represents NULL on that machine. Thus the compiler has to know that NULL value for that particular machine.
Now, this means that whenever I use 0 in pointer context, it is replaced by the appropriate value representing NULL on that machine, which may or may not be 0. So, how can I tell the compiler that I actually mean 0 and not NULL, when I use 0 in pointer context?
Sorry for the long description. Correct me if I am wrong

Answer 1

One way is to store all-bits-zero into your pointer:

void* zero;
memset(&zero, 0, sizeof(zero));