Example 1 :
-----------


#include <iostream>
using namespace std;

int main() {
  cout << "Hello World !";
  return 0;
}


Example 2 :
-----------


#include <iostream>
using namespace std;

int main() {
  int a;

  cout << "Hello, when did you arrive ?\n";
  cin >> a;
  cout << "You are "<< 2002-a << " years old.\n";
  
  return 0;
}


Example 3:
----------


#include <iostream>
using namespace std;

int main() {
  float fahr, cel;

  cout << "Please input temperature (in Fahr)\n";
  cin >> fahr;
  cel = (fahr - 32)*5/9;
  cout << "Temperature (degrees Celsius) = " << cel <<".\n";

  return 0;
}