#include <iostream>
using namespace std;

int main() {
	int *ptr;

	ptr = new int;
	cout << "\nptr after assigning it a block of memory but before" << endl
		<< "assigning the block of memory a value" << endl;
	cout << "ptr = " << ptr << endl;
	cout << "*ptr = " << *ptr << endl;

	*ptr = 30;
	cout << "\nptr after assigning it a block of memory and after" << endl
		<< "assigning the block of memory a value" << endl;
	cout << "ptr = " << ptr << endl;
	cout << "*ptr = " << *ptr << endl;
}