Overload output (<<) and input (>>) operators

#include <iostream>
using namespace std;

class MyClass {
  int x, y, z;
public:
  MyClass(int a, int b, int c) { x = a; y = b; z = c; }
  friend ostream &operator << (ostream &stream, MyClass obj);
  friend istream &operator >> (istream &stream, MyClass &obj);
} ;

ostream &operator << (ostream &stream, MyClass obj)
{ cout<<"\n Insertion ( << ) operator\n";
  stream << obj.x << ", ";
  stream << obj.y << ", ";
  stream << obj.z << "\n";
  return stream; // return the stream
}

istream &operator >> (istream &stream, MyClass &obj)
{
  cout << "\n\n Extraction ( >> ) operator\n Enter X,Y,Z values: ";
  stream >> obj.x >> obj.y >> obj.z;
  return stream;
}

void main()
{
  MyClass a(1, 2, 3);

  cout << a;

  cin >> a;
  cout << a;

  system("pause");
}