The type of control structure shown is best described as a

Question

BlackTom AI · Accepted Answer

A for-loop with an explicit loop variable running from 1 to 3 is a counter-controlled repetition (counter repetition).

1. Relevant knowledge points and concepts
- Control structures: sequence (straight-line execution), selection/conditional (if/then/else branches), and repetition/iteration (loops).
- Types of repetition: counter-controlled (loop runs a fixed number of times using a loop counter) vs conditional-controlled (loop continues while/until a condition is true, number of iterations not predetermined).
- The “For I ← 1 to 3 … Next” form is the canonical counter-controlled loop.

2. Step-by-step reasoning process
- The pseudocode shows: For I ← 1 to 3 Print I Next. This explicitly sets a loop counter I and a fixed range (1 to 3).
- Execution steps:
  - Step 1: I = 1 → Print 1.
  - Step 2: I = 2 → Print 2.
  - Step 3: I = 3 → Print 3.
  - Step 4: I exceeds 3 → loop terminates, continue to End.
- Because the loop uses a counter I and runs a known number of times (three iterations), it is counter-controlled repetition.

3. Intermediate steps / calculations
- Iteration values shown explicitly: 1, 2, 3 printed in order; no arithmetic beyond incrementing the counter by 1 each time.

4. Why the correct answer is correct
- The loop’s control is the counter variable I and a fixed range. That matches the definition of counter repetition: iteration controlled by a counter with a predetermined number of repetitions.

5. Why the other options are incorrect
- “Counter sequence” is not a standard control-structure category; sequence refers to straight-line execution without looping.
- “Conditional selection” describes if/then/else branching, not repetition.
- “Conditional loop” (conditional-controlled repetition) would use a condition like While or Repeat Until where the number of iterations depends on a run-time condition, not a fixed counter.

6. Conclusion
- Therefore the best description is a. counter repetition. This matches the provided answer.

The type of control structure shown is best described as a单项选择题

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