What is a code comment and why is it important for maintenance?

What is a code comment and why is it important for maintenance?

• A. A note in code explaining logic or decisions; helps others understand intent.
• B. A syntax error that stops code from running.
• C. A type of function.
• D. A runtime exception.

Answer: (A)

Code comments are notes in the source code that explain what the code is doing or why certain decisions were made. They’re read by humans, not the computer, so they don’t affect how the program runs. For maintenance, comments are invaluable because they capture the intent behind complex or non-obvious code. They help someone reviewing or updating the program understand why a particular approach was chosen, what edge cases were considered, and what a function expects or returns. This makes it faster and safer to modify the code later, fix bugs, or onboard new team members. Comments should be concise and relevant, providing just enough context to clarify intent without repeating what the code already clearly expresses. Other ideas aren’t about maintaining code: a note that is actually a syntax error would stop the program from running, a function is something the code executes to perform tasks, and a runtime exception is an error that happens during execution. These describe problems or constructs, not helpful documentation for future maintenance.

Code comments are notes in the source code that explain what the code is doing or why certain decisions were made. They’re read by humans, not the computer, so they don’t affect how the program runs.

For maintenance, comments are invaluable because they capture the intent behind complex or non-obvious code. They help someone reviewing or updating the program understand why a particular approach was chosen, what edge cases were considered, and what a function expects or returns. This makes it faster and safer to modify the code later, fix bugs, or onboard new team members.

Comments should be concise and relevant, providing just enough context to clarify intent without repeating what the code already clearly expresses.

Other ideas aren’t about maintaining code: a note that is actually a syntax error would stop the program from running, a function is something the code executes to perform tasks, and a runtime exception is an error that happens during execution. These describe problems or constructs, not helpful documentation for future maintenance.