#include <iostream>
#include <fstream>
using namespace std;
 
int main()
{
 int a[5]={5,6,7,8,9};
 int *p;
 p=a;
 cout << *(p+3)  << endl;
 int *p2=p+3;
 cout << p2[-1]<< endl;
 cout << *(a+2)<< endl;
 int *p3=a;
 p3++; //es OK
 cout << *p3<< endl;
// a++;  // genera error
}