//Introduction to pointers. Demonstrate how a pointer can travel through every memory location of an array.
#include <iostream>
#include <stdlib.h>
using namespace std;

int main ()
{
  int numbers[3]={};//initialized as the zero vector of length three.
 
  int * p; //declaration of a pointer. "*p is the integer value stored here!"

  p = numbers; //settling the memory location for the pointer here is the array numbers.

 *p = 10; // Now we have filled the 'value' at the memory location with the int 10.

 cout << numbers[0] << " "<< endl; // Just to confirm we print this to the screen.
  
  *p = *p+1; //An assignment of value stored at numbers[0] to *numbers[0] + 1.
 cout << "*p=*p+1= " << *p <<endl; // remember *p is the integer value stored and which we have incremented by 1.
  *p = *(p+1);
 cout << "We demonstrate a different assignment for *p i.e., *p =*(p+1)." << *p << endl;
  p++; //Hopping to the next memory location of the array numbers.

 *p = 20; // Putting a value there in.

 cout << numbers[1] << endl; //confirming the expected output.

  p++ ; *p= 3;

 cout << numbers[2] << endl; //Just a recursive repetition of what we saw above!

  return 0;
}