Which of these computer language keywords is not used for looping?

• A. While
• B. Crt
• C. Do
• D. For

Answer: (B)

Looping is controlled by keywords that explicitly drive repetition, like while, do, and for. While checks a condition and repeats as long as it’s true. Do, as part of a do...while construct, runs the block at least once and then checks the condition. For repeats the block a specific number of times or until a condition changes, often using a loop index. Crt isn’t a looping keyword; it isn’t used to control or implement repetition. It’s associated with other purposes (such as screen or I/O utilities in some languages) and does not create a loop, so it’s the one that does not fit with the looping constructs.