#include <iostream.h> // The C++ input and output definitions.

void main(void)
{
  int i;

  cout << "Enter an integer: ";
  cin >> i;

  // What you should do: *do* the cout if i == 0:
  if (i == 0) cout << "You entered zero.\n";

  // What some students want to do: *skip* the cout if i != 0 (UNALLOWED):
  if (i != 0) goto skip;
  cout << "You entered zero.\n";
skip:

  // Another way of doing this (UNALLOWED):
  if (i != 0) ; else cout << "You entered zero.\n";
  // If the if's statement is blank, invert the condition.

  // What some students want to bring inside the if-construct:
  if (i == 0) cout << "You entered zero.\n";
  else cout << "Have a nice day!\n";  // Inside the ifs: *sometimes* executed
}