Assign integer literal to pointer?

Question

This question might be too bad but I can take risk to post this question here to address my confusion.

Actually my question is that we can only assign address to poi

Answer 1

barak manos already pointed it out in his comment:

If you want to set a pointer to a literal value, you need to cast the literal value to the corresponding pointer type first.

NULL could just as well be defined as (void *) 0... which is implicitly convertible to any pointer type.

In either case, you end up with a pointer pointing to a literal address.

In no case, however, does your pointer point to memory containing a literal 4, though. This is, to my knowledge, not possible without assigning that literal value to an int first:

int i = 4;
int * p = &i;