//HELP.CPP demonstrates comments.
  #include <iostream.h>

 int main()
 {
 /* 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 */
 return 0;
 }