#include <iostream>

using namespace std;

void SetPtr(int ary[], int * & ptr);

int main() {
   int a{100};
   int * b{nullptr};

   cout << "Initialization " << endl;
   cout << "a = " << a << endl;
   cout << "&a = " << &a << endl;
   cout << "b = " << b << endl;
   //cout << "*b = " << *b << endl;
   cout << endl << endl;

   b = & a;
   *b = -99;

   cout << "After b=&a; *b = -99" << endl;
   cout << "a = " << a << endl;
   cout << "&a = " << &a << endl;
   cout << "b = " << b << endl;
   cout << "*b = " << *b << endl;
   cout << endl << endl;

   int ary[10]{1,1,1,1,1,1,1,1,1,1};
   b = ary;
   int i;

   cout << "setting the array " << endl;
   // change the values of the array.
   for(i = 0; i < 10; ++i) {
      cout << "\tAt position " << i << " A[i] = " << *b ;
      *b = i;
      cout << " but gets set to " <<  *b << endl;
      //b = ary + i * size_of(int);
      ++b;
   }
   cout << endl << endl;

   cout << "After the array is changed " << endl;
   // print out the array
   for(i = 0; i < 10; ++i) {
      cout << "\tary[i] = " <<  ary[i]  << endl;
   }
   cout << endl << endl;

   cout << "A pass by reference" << endl;
   cout << "b = " << b << endl;
   int bry[] {9,8,7,6,5,4,3,2,1,0};

   SetPtr(bry, b);
   cout << "After the call " << endl;
   cout << "bry = " << bry << endl;
   cout << "b = " << b << endl;

   cout << endl << endl;
/*
   const int * ptr1{nullptr};
   ptr1 = & a;
   // *ptr1 = 8;
  
   
   int const * ptr2{nullptr};
   ptr2 = & a;
   // not legal, it is pointing to a non-changable item
   // *ptr2 = 88;

   int * const ptr3{&a};
   *ptr3 = 99;
   // nope, now the ponter variable is constant.
   //ptr3 = nullptr
*/
   return 0;
}

void SetPtr(int ary[], int * & ptr) {
    ptr = ary;
}