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Comments 

Comments are pieces of text used to annotate a program. Comments are for the programmer's use only; they are stripped from the source text before parsing.
There are two ways to delineate comments: the C method and the C++ method. The compiler supports both methods, and provides an additional, optional extension permitting nested comments. If you are not compiling for ANSI compatibility, you can use any of these kinds of comments in both C and C++ programs.
You should also follow the guidelines on the use of whitespace and delimiters in comments discussed later in this topic to avoid other... more 

Whitespace 

Whitespace is the collective name given to spaces (blanks), horizontal and vertical tabs, newline characters, and comments. Whitespace can serve to indicate where tokens start and end, but beyond this function, any surplus whitespace is discarded. For example, the two sequences