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Most C compilers offer two ways of putting comments in your program. The first method is to use the /* and */ symbols to denote the beginning and end of a comment. Everything from the /* symbol to the */ symbol is considered a comment and is omitted from the compiled version of the program. This method is best for commenting out sections of code that contain many comments. For instance, you can comment out a paragraph containing comments like this: /* This portion of the program contains a comment that is several lines long and is not included in the compiled version of the program. */ The other way to put comments in your program is to use the // symbol. Everything from the // symbol to the end of the current line is omitted from the compiled version of the program. This method is best for one-line comments, because the // symbol must be replicated for each line that you want to add a comment to. The preceding example, which contains four lines of comments, would not be a good candidate for this method of commenting, as demonstrated here: // This portion of the program contains // a comment that is several lines long // and is not included in the compiled // version of the program. You should consider using the /* and */ method of commenting rather than the // method, because the // method of commenting is not ANSI compatible. Many older compilers might not support the // comments.