[C++] lifetime error demo (undefined behavior)

#include <iostream>

using std::cout;
using std::endl;

int main() {
    int *x;

    {
        // n become alive here
        int n = 5;

        // Get the address of n
        int* y = &n;

        // Share the address of n to x
        x = y;
    } // n lives until here

    // Now, assess n, which is no longer alive
    // The behavior is undefined.
    cout << *x << endl;

    return 0;
}