#include <iostream>
using namespace std;

void a(int *i_ptr)
{
  *i_ptr = 12;
}

int main()
{
  int i;
  int *i_ptr;

  i = 5;         // Set the value of i
  i_ptr = &i;    // Set i_ptr to be the address of i

  cout << "Before calling a(): i is: " << i << endl;
  a(i_ptr);
  cout << "After  calling a(): i is: " << i << endl;
  return 0;
}