#include <iostream>

using namespace std;

int main(){
    int x = 3;
    int temp;
    cout << "The address of x is " << &x << "\n";
    cout << "Input the address of x: ";
    cin >> hex >> temp;
    cout << "The address is " << hex << "0x" << temp << ".\n";
    int *ptr = (int *)temp; // casting "int" to "int pointer"
    cout << "The pointer value is " << *ptr << ".\n";
    cout << "Enter a new value: ";
    cin >> *ptr;
    cout << "The new value of x is " << x << ".\n";
    return 0;
}