#include <iostream>

using namespace std;

int sq(int y);

// A simple way to square x with a pass-by-value function
// There are several errors in this code.  Find them and fix them.
int main() {
  int x = 0;

  cout << "Please enter an integer: ";
  cin >> x;

  cout << "Original x: " << x << endl;
  cout << "x squared: " << sq(x) << endl;
  cout << "Value of x is still: " << x << endl;

  // output the z from the function below
  cout << z;

  // count from 0 to 4
  for(int i = 0; i < 5; i++);
  // increment i
  i = i + 1;

  if (x != 0) {
    int i = 5;
    cout << "i: " << i << endl;
    int x = 5;
    cout << endl << "x = " << x << endl;
  }

  // output i
  cout << "i: " << i << endl;

  return 0;
}

int sq(int z) {
  // x is defined in main
  cout << x;
  // return the negation of z
  return z*z;
}