Exercise 4.2
Slicing an object during parameter passing.

On the program that belongs to the accompanying slide the parameter of the function f is passed by C++ reference.

Now assume that the parameter is passed by value:

int f(A x){
  A  y = x,
    *z = &x,
    &w = x; 

  cout << y.op() << endl;    
  cout << z->op() << endl;   
  cout << w.op() << endl;    
}

What will be the output of the 3 output statements at the bottom of f. Please predict the result before you run the program.