# include <cstdlib>
# include <iostream>

using namespace std;

int main ( )

//
//  FORMULA.CPP
//
//  This program shows how three variables, X, Y and Z can be declared,
//  but 
//
//    X is given a value in the declaration statement, 
//    Y is given a value by user input,
//    Z is given a value by an assignment statement using a formula
//      based on the values of X and Y.
//
{
  int x = 12;
  int y;
  int z;

  cout << "Enter the value of y: ";
  cin >> y;

  z = x + 42 * y;

  cout << "x = " << x << "\n";
  cout << "y = " << y << "\n";
  cout << "z = " << z << " = " << x << " + 42 * " << y << "\n";

}