Which type of control structure is shown below? Begin Input Height If Height 1.9 Then Tall ← True Else Tall ← False End If Print Tall End

Question

Which type of control structure is shown below? Begin Input Height If Height > 1.9 Then Tall ← True Else Tall ← False End If Print Tall End

BlackTom AI · Accepted Answer

The code contains an If...Then...Else decision, so it demonstrates selection combined with ordinary ordered statements (sequence).

1) Relevant concepts:
- Selection (conditional): a control structure that chooses between two or more alternative paths based on a Boolean test (If...Then...Else).
- Sequence: the simple, linear execution of statements one after another (input, evaluate, assign, print).
- Repetition (looping) is not present since there is no construct that repeats statements.

2) Step-by-step reasoning through the pseudocode:
- Step 1: Input Height — a single sequential statement executed first.
- Step 2: If Height > 1.9 Then — the program evaluates the Boolean condition (Height > 1.9).
- Branch A (condition true): Tall ← True — assignment executed if the condition is true.
- Branch B (condition false): Tall ← False — assignment executed if the condition is false (the Else branch).
- Step 3: End If — the branch ends and execution continues.
- Step 4: Print Tall — a sequential statement executed after the conditional.

3) Calculations: none required; just the logical evaluation Height > 1.9 determines which assignment occurs.

4) Why the correct answer is correct:
- The presence of If...Then...Else is the textbook example of selection: it selects between two alternative actions.
- The Input and Print statements and the assignment inside each branch follow a fixed order, so sequence is also present. Together the program uses selection (the conditional) within an overall sequential flow.

5) Why the other options are incorrect:
- a. Sequence (and c. Sequence): they ignore the conditional branching; the code is not purely sequential because behavior depends on the condition.
- b. Repetition: there is no loop (no While/For/Repeat), so repetition is not used.

Conclusion: The program uses both selection and sequence, so the correct choice is d. Selection and sequence. This matches the provided answer.

Which type of control structure is shown below? Begin Input Height If Height > 1.9 Then Tall ← True Else Tall ← False End If Print Tall End单项选择题

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