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Comments in C++

Comments are non-executable text that help developers understand code. The compiler completely ignores them during compilation.

Single-line Comment

// This is a comment

Everything after // on that line is ignored by the compiler.

Use case: Quick notes, disabling one line

Multi-line Comment

/* This is a
   multi-line comment */

Everything between /* and */ is ignored, spanning multiple lines.

Use case: Block descriptions, documentation

Best Practices

→Explain WHY, not WHAT — the code shows what, comments explain reasoning

→Keep comments up to date when code changes

→Use comments to mark TODO items and known issues

→Don't over-comment obvious code like i++ // increment i

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