#include <iostream>
#include <string>
using namespace std;

void loader(string * &w){
	string *wl = new string[3];
	wl[0] = "First";
	wl[1] = "Second";
	wl[2] = "Third";
    w = wl;    
}

void main(){
	string *w;
	loader(w);
	for(int ind = 0; ind < 3; ind++){
		cout << w[ind] << endl;
	}
	delete [] w;


	int **pi;
	int *i;
	int j = 666;

	i = &j;
	cout << "address of j "<< &j << endl;
	cout << "value in i " << i << endl;
	cout << "dereference of i " << *i << endl;
	cout << "address of i " << &i << endl;
	*i = 13;
	cout << "new j " << j << endl;
	pi = &i;
    **pi = 123;
	cout << "value in pi " << pi << endl;
	cout << "new j " << j << endl;
	int ai[5];
	for(int k = 0; k < 5; k++)
		ai[k] = k + 1;
	cout << "contents of ai " << endl;
	for(int k = 0; k < 5; k++)
		cout << ai[k] << endl;
	//i = j; not allowed
	i = ai;// ai is actually the address of the first element
	cout << "i " << i << endl;
	cout << "*i = " << *i << " ai[0] = " << ai[0]<< endl;
	i = &ai[0];// same as i = ai
	cout << "i " << i << endl;
	i++;
	cout << "i++ " << i << endl;
	cout << "*i " << *i << endl;
	i = ai;
	for(;i < ai+5; i++)
	   cout << *i << endl;
	cout << i << endl;
	cout << *i << endl;// invalid
	cout << "addresses of ai " << endl;
	for(k = 0; k < 5; k++)
		cout << &ai[k] << endl;
	int *ptrs_ai[5];
	for(k = 0; k < 5; k++)
		 ptrs_ai[k] = &ai[k];
	cout << "array of pointers" << endl;
	for(k = 0; k < 5; k++)
		 cout << ptrs_ai[k] << endl;
	int **p_ptrs_ai;
	p_ptrs_ai = ptrs_ai;
	cout << "single and double pointer dereference " << endl;
	for(; p_ptrs_ai < ptrs_ai + 5; p_ptrs_ai++)
		cout << *p_ptrs_ai << " " << **p_ptrs_ai << endl;

}