#include <iostream>
#include <vector>

using namespace std;

void objectPointers(){
  vector<int>* v = new vector<int>;
  cout << "Address: " << v << endl;

  for( int i = 0; i < 10; i++ ){
    (*v).push_back(i);
  }

  cout << "Address: " << v << endl;

  for( int i = 0; i < (*v).size(); i++ ){
    cout << (*v)[i] << endl;
  } 
 
  cout << "Address: " << v << endl;
}

void objectPointersBetterApproach(){
  vector<int>* v = new vector<int>;

  for( int i = 0; i < 10; i++ ){
    v->push_back(i);
  }

  for( int i = 0; i < v->size(); i++ ){
    cout << v->at(i) << endl;
  }
}

void objectPointers2(){
  vector<int>* vPtr;  // declare a vector<int> pointer, initially points somewhere random
  vector<int> vec;  // declare a vector object

  vPtr = &vec;

  vPtr->push_back(10);
  vPtr->push_back(20);

  for( int i = 0; i < vec.size(); i++ ){
    cout << i << ": " << vec[i] << endl;
  }

  cout << "Address: " << vPtr << endl;
}

void address(){
  int x = 10;
	
  int* xPtr = &x;
	
  cout << "Address: " << xPtr << endl;
  cout << "Value: " << *xPtr << endl;
}

void changingValue(){
  int x = 10;

  int* xPtr = &x;
  
  cout << "Address: " << xPtr << endl;

  (*xPtr)++;

  cout << "Address: " << xPtr << endl;
  cout << "x: " << x << endl;
}

void precedence(){
  int x = 10;
  int* xPtr = &x;

  cout << "Address: " << xPtr << endl;

  *xPtr++;

  cout << "Address: " << xPtr << endl;
  cout << "x: " << x << endl;
  cout << "*xPtr: " << *xPtr << endl;
}

void twoPointers(){
  int x = 10;

  int* xPtr = &x;
  int* x2Ptr;

  x2Ptr = xPtr;

  (*x2Ptr) = 20;

  cout << "x: " << x << endl;
  cout << "xPtr: " << xPtr << endl;
  cout << "x2Ptr: " << x2Ptr << endl;
}

int main(){
  twoPointers();
}