COMMENT

  The special characters // indicate the start of a comment.  The
  comment is ended by the end of a line.  Comments may start in
  any column, and may be on a line by themselves or on the same
  line FOLLOWING an executable statement or any portion of an
  executable statement.  A comment may not PRECEDE an executable
  statement or any portion thereof on a line.

  // This commment is on a line by itself

        while (1) {       // This comment follows a statement
                .
                .
                .
          }