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

void printFirst1(int i)   // int - by value
{
  cout << i << endl;
  i++;    // does not reflect in main 
}

void printFirst4(int &i)  // int - by reference
{
  cout << i << endl;
  i++;    // does affect
}

void printFirst2(int *i)  // pointer to int
{
  cout << *i << endl;
  (*i)++;  // does affect
}

void printFirst3(int i[]) // array of int
{
  cout << i[0] << endl;
  a[0]++;   // does affect;
}

int main() 
{
   int a[]= {5};

   printFirst1(a[0]);
   printFirst2(a);
   printFirst3(a);
   printFirst4(a[0]);
   return 0;
}