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¶ … added to each program that you write. A comment is an explanation, written by humans. The compiler ignores comments.
Adding comments to codes is excellent programming practice. Good comments can help browsing the code quickly, keep track of what is done as you build a complex program, and serves as reminder for any modifications. Comments can be used to hide parts of code that needs to be saved for special situations or isolate some portions while you work on something that might cause conflict. In a team of programmers where codes are passed from one individual to another, comments can be a powerful tool to understand the purpose and associations of each part.
Kinds of Comments
Single Line Comments (/ / ... )
Purpose:
Suitable for brief remarks on the function or structure of statement or expression. They require only an opening tag: as soon as you start a new line, you're back into code.
Advantages:
Does not take fair amount of space
Can nest single-line type of comments
Can appear inside multi-line comments
Disadvantages:
Cannot insert a space between the two slashes.
The number of delimiters to be used is equal to the number of lines consumed by a comment.
2. Multi-line Comments (/* ... */)
Purpose:
Good for any comment that will cover more than one line, as when you want to go into some detail about what's happening in the code or when you need to embed legal notices in the code. It requires both opening and closing delimiters.
Advantages:
You can put as many lines of discussion or as many pages of boilerplate as you like between this two tags.
You can nest single-line comments inside of the multi-line comments and the compiler will have no trouble with it at all.
Can act as if it were a single line statement, even though it can contain more than one statement.
Disadvantages:
Cannot nest multi-line types of comments of any sort because that will generate a compiler error.
Multi-line comments take up a fair amount of space. This means that they increase the effective line length.
If the programmer forgot the closing delimiter, it might cause either a run-time or syntax error.
Reference
"The Sofia Open Content Initiative - Java Programming." Sofia Open Content Initiative. 2004.
Sofia Open Content Initiative. 11 May 2005 .
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