Issue with re-assigning something to the same pointer

Question

#include <iostream>
using namespace std;

int main() {
int*p=0; int x=1;
*p = &x; // why can we not re-assign &x to pointer p?
cout << p;

// outputs error

Answer 1

See the error message:
Invalid conversion from int* to int

You are assigning address of <x> (which is a int*) as value for data in memory pointed to by <p>.

*p = &x;

*p -> value pointed by <p> (an int)
&x -> address of <x> (a pointer)

(Edit)
I think you should use NULL in place of 0 in the pointer declaration