/** Demonstrate basic pointer usage. */
#include <iostream>
using namespace std;
int main()
{
    int a;                  // a is an integer
    int *aPtr = nullptr;    // aPtr is a pointer to an integer
 
    a = 7;      // give a a value
    aPtr = &a;  // set aPtr to the address of a
 
    cout << "The value of a is:     " << a << endl
         << "The address of a is:   " << &a << endl
         << "The value of aPtr is:  " << aPtr << endl;
 
    cout << endl;
 
    cout << "The value of a is:     " << a << endl
         << "The value of *aPtr is: " << *aPtr << endl;
    cout << endl;
 
    cout << "Showing that * and & are inverses of each other:"
         << endl
         << "&*aPtr = " << &*aPtr << endl
         << "*&aPtr = " << *&aPtr << endl;
    return 0;
}