Comments are explanatory notes or text intended for human readers to help them understand what a program or section of a program does.

There are two kinds of comments: block comments and end-of-line-comments.

Block comments begin with the character sequence slash-asterisk /*, which is followed by any number of other characters and line breaks, followed by a closing asterisk-slash */ sequence. The entire contents of all block comments are ignored.

End-of-line comments begin with two consecutive slash characters // followed by any number of characters up to and including the end of the current line. The entire contents of all end-of-line comments are ignored.