For writing data to the screen, there are also two statements, one of which you've seen already in last chapter's programming assignment:

The writeln (write_line)  statement skips to the next line when done.

You can use strings in the argument list, either constants or literal values. If you want to display an apostrophe within a string, use two consecutive apostrophes. Displaying two consecutive apostrophes would then requires you to use four. This use of a special sequence to refer to a special character is called escaping, and allows you to refer to any character even if there is no key for it on the keyboard.