Difference between dereferencing NULL pointer and uninitialised pointer

Question

On code blocks(C++)

#include
using namespace std;
int main(){
    int *p;
    cout<<*p;
}

produces garbage value

Answer 1

In the first code as we are not setting the pointer it is taking random value address... Which may have some garbage value. But in second case pointer is not pointing to any address so obviously it will fail