#include <iostream>
  
int main()
{
    using std::cout;
  
    /* this is a comment
    and it extends until the closing
    star-slash comment mark */
    cout << "Hello World!\n";
    // this comment ends at the end of the line
    cout << "That comment ended!\n";
  
    // double slash comments can be alone on a line
    /* as can slash-star comments */

    system("PAUSE");  // prevent the console window from closing
    return 0;
}