C++ Introduction to Pointers

#include <iostream>
using namespace std;
int main()
{
 int x = -99;
 cout << "Size of x: " << sizeof(x) << endl;
 cout << "Address of x: " <<  &(x)  << endl;
 cout << "Size of Address of x: " <<  sizeof(&x)  << endl;
 cout << "Value pointed to by Address of x: " <<  *(&(x))  << endl;
 cout << "Size of value pointed to by Address of x: " <<  sizeof(*&x)  << endl;
 cout << endl;
 cout << "Pointer Variables" << endl;
 int* xptr = &x;
 cout << "Size of xptr: " << sizeof(xptr) << endl;
 cout << "Value pointed to by xptr: " << *xptr << endl;
 cout << "Address of xptr: " <<  &(xptr)  << endl;
 cout << "Size of Address of xptr: " <<  sizeof(&xptr)  << endl;
 cout << "Value pointed to by Address of xptr: " <<  *(&(xptr))  << endl;
 cout << "Size of value pointed to by Address of xptr: " <<  sizeof(*&xptr)  << endl;

}