Which statement about the following block is TRUE?

Question

BlackTom AI · Accepted Answer

GOTO jumps unconditionally to a labeled statement, so in this block control keeps returning to the labeled location. Relevant concepts: - A label in PL/SQL is written as <> and marks the following statement; its placement here (immediately before the NULL statement) is legal. - NULL is a valid statement in PL/SQL that does nothing and returns control to the next statement. - GOTO transfers control to the labeled statement unconditionally. - The condition 1=1 is always true, so the IF body always executes. Step-by-step execution: 1. Execution starts at BEGIN and reaches the label check_status which marks the next statement. 2. The NULL statement executes (no operation), then control proceeds to the IF. 3. The IF evaluates 1=1 → true, so execution enters the IF body. 4. GOTO check_status executes; control transfers back to the labeled statement (the NULL). 5. After NULL, execution reaches the IF again, the condition is still true, and GOTO is executed again. 6. Steps 4–5 repeat indefinitely because there is no change of state and no exit condition. Why this yields an infinite loop: - The loop formed by the label → NULL → IF (true) → GOTO label has no terminating condition or side-effect that could change the truth of 1=1. Because GOTO is unconditional and the condition is always true, control cycles forever. Why the other options are incorrect: - "It executes only once and ends normally": false — GOTO sends control back, so it does not terminate after one pass. - "It results in a compilation error due to label placement": false — label syntax <> before a statement is valid in PL/SQL. - "NULL cannot be used with GOTO": false — GOTO may target any labeled statement (including a NULL). Therefore, the correct statement is: It results in an infinite loop.

Which statement about the following block is TRUE?单项选择题

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