#include <iostream>
using namespace std;

int main()
{
	double *p;      // a pointer is created for double type, 
                    // but currently points nowhere
	
    p = new double; // memory is allocated to store a double value, 
                    // but currently not initialized. 
                    // p now points to that location 

	*p = 17.5;      // memory location pointed by p contains 17.5
	
    cout << "memory location at address " << p 
		 << " contains " << *p << endl;

	double *q = NULL; 
	//q = (double *)0x003960c8;
	//q = 123.45;
	if (q != NULL)
		cout << *q << endl;
	q = p;          // q points to the same memory location as p
	// *q = *p;

	cout << "memory location at address " << q 
		 << " contains " << *q << endl;

	*q = *p + 1;
	cout << *q << " " << *p << endl;

	return 0;
}