// This program illustrates the difference between pointers and references.
//
// When you have a pointer, use * to get to the location/value it point to.
//
// When you have a reference, you don’t need *.  A reference is an alias
// for a location.  It’s sort of like a pointer with auto-*.
//
// You can change where a pointer points to.
// A reference, however, can never be “re-seated”.  Once it’s declared,
// it is forevermore an alias for that location.

#include <iostream>
using namespace std;

int main() {
    double data[] = {1.2, 3.4, 5.6, 7.8};
    double *p = &data[1];	// p points to 3.4
    double &r = data[2];	// r is an alias for data[2]

    cout << "p points to " << *p << '\n';	// Note the star
    cout << "r refers to " << r << '\n';	// Note the lack of star
    p = &data[0];				// Reassign the pointer
    cout << "p now points to " << *p << '\n';
    r = 6.66;					// change data[2] to 6.66
    r = data[3];				// change data[2] to 7.8
    // The previous line did NOT reseat r.  It just modified data[2],
    // to which r must always refer.
    cout << "r refers to " << r << '\n';
    return 0;
}