// name: Pointers.cpp
// desc: example showing some pointer operations
//
// to compile:
//        g++ -o Pointers Pointers.cpp

#include <iostream>
using namespace std;

// entry point
int main( int argc, char ** argv )
{
    cerr << "foo" << endl;
   
    // a variable of type 'int'
    int n = 23;
    cerr << "n: " << n << endl;
    cerr << "&n: " << &n << endl;
    
    // a variable of type 'int *'
    int * pn = &n;
    cerr << "*pn: " << *pn << endl;
    cerr << "*&n: " << *&n << endl;
    cerr << "&pn: " << &pn << endl;
    
    // writing to what pn is pointing to
    *pn = 29;
    cerr << "*pn: " << *pn << endl;
    cerr << "n: " << n << endl;
    
    // a variable of type 'int **'
    int ** ppn = &pn;
    
    return 0;
}