// Example program
#include <iostream>
#include <string>

using namespace std;

void by_reference(int &number) {
    cout << "reference in by_reference " << &number << endl;
    cout << "by reference" << endl;
    cout << number << endl;
    number=100;
    cout << number << endl;
    cout << "-------------" << endl;
}

void by_value(int number) {
    cout << "reference in by_value " << &number << endl;
    cout << "value in by_value " << *(&number) << endl;
    cout << "by value" << endl;
    cout << number << endl;
    number++;
    cout << number << endl;
    cout << "-------------" << endl;
}

int main()
{
  int number = 1;
  cout << "reference in main " << &number << endl;
  cout << "value in main " << *(&number) << endl;
  by_value(1);
  //cout << number << endl;
  by_reference(number);
  cout << "value in main after changing " << *(&number) << endl;
  return 0;
}