What type of control structure is shown below?

Question

BlackTom AI · Accepted Answer

The loop header "While I <> 'End'" shows the repetition is controlled by a boolean condition (I not equal to "End"), so this is a conditional loop. 1) Relevant knowledge points and concepts - Conditional (or indefinite) loop: repeats as long as a boolean condition is true (example: while condition do ...). The number of iterations is not predetermined. - Counter (definite) loop: repeats a fixed number of times controlled by a numeric counter (example: for i = 1 to N). - Conditional selection: decision structures like if/then/else that choose between branches but do not inherently repeat. - The given pseudocode is a pre-test while-loop (check condition, then execute body). 2) Step-by-step reasoning process - The displayed code: Begin; While I <> "End" ; Input I ; Print "You are an, ", I ; End While ; End. - Step 1 on entering the While: evaluate condition I <> "End". - Step 2 if condition true: execute body (read Input I, then Print). - Step 3 after body: control returns to the While test and repeats until the condition becomes false (i.e., user inputs "End"). - Because the loop continues based on the boolean test and stops only when the input equals "End", iterations are not fixed ahead of time. 3) Intermediate steps shown - Initial test -> Input -> Print -> Re-test -> repeat until I == "End". 4) Why the correct answer is correct - The loop’s continuation depends explicitly on a condition (I <> "End"), matching the definition of a conditional (while) loop. It is an indefinite repetition structure that stops when the condition fails. 5) Why the other options are incorrect - b. Conditional selection: incorrect because selection (if/else) chooses a single branch rather than repeating a block. - c. Counter loop: incorrect because there is no counter variable or fixed iteration count. - d. Counter sequence: not applicable; the code does not use or describe a counting sequence. 6) Conclusion This is a conditional loop (option a), which matches the provided correct answer.

What type of control structure is shown below?单项选择题

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