Which statement correctly describes the do-while loop?

• A. It executes the loop body only if the condition is true at the start
• B. It checks the condition before entering the loop
• C. It guarantees at least one execution of the loop body
• D. It cannot be used for user input scenarios

Answer: (C)

Do-while loops perform the loop body first and then test the condition, so the body runs at least once. This post-test behavior guarantees an initial execution regardless of the condition’s value before the first iteration. It’s handy for cases like user input, where you want to perform the prompt and then check the response; you’ll always prompt at least once and repeat only if the input isn’t valid. For example, you can prompt the user, read their input, and then loop again if the input doesn’t meet the criteria. This contrasts with a pre-test loop, which checks the condition before running the body and might execute zero times if the initial condition is false.