Which loop guarantees at least one execution of its body?

Which loop guarantees at least one execution of its body?

• A. Do...While Loop
• B. Deployment
• C. Derived Class
• D. Dictionary

Answer: (A)

The behavior of loop constructs in terms of when the body runs is being tested. A do-while loop executes its body first and then evaluates the condition to decide whether to repeat. Because the body runs before any condition check, it will execute at least once, even if the condition is false right away. In contrast, a typical while loop checks the condition before running the body, so the body might not execute at all if the condition starts as false. The other options—deployment, derived class, and dictionary—are not looping constructs; they refer to deployment processes, a subclass in a programming hierarchy, and a data structure, respectively, so they don't address the question of loop execution timing. Therefore, the do-while loop is the one that guarantees at least one execution of its body.

The behavior of loop constructs in terms of when the body runs is being tested. A do-while loop executes its body first and then evaluates the condition to decide whether to repeat. Because the body runs before any condition check, it will execute at least once, even if the condition is false right away. In contrast, a typical while loop checks the condition before running the body, so the body might not execute at all if the condition starts as false. The other options—deployment, derived class, and dictionary—are not looping constructs; they refer to deployment processes, a subclass in a programming hierarchy, and a data structure, respectively, so they don't address the question of loop execution timing. Therefore, the do-while loop is the one that guarantees at least one execution of its body.