Evaluate the code snippet. Now, the IF-statement and the 'outputLabel' statements are swapped.

What is the value displayed by the 'outputLabel' after 1 button click?

Question

Evaluate the code snippet. Now, the IF-statement and the 'outputLabel' statements are swapped.

What is the value displayed by the 'outputLabel' after 1 button click?

BlackTom AI · Accepted Answer

To tackle this problem, I’ll break down what the code blocks are doing and how the swap changes the behavior step by step.
Option analysis start:
- Option '30.3': This would correspond to accessing the element at position 4 in a 1-based list (assuming standard list indexing), or position 3 in 0-based indexing. If the code were to first update the index and then read the list, you might land on a later element like 30.3. Since the scenario mentions a swap between the IF-statement and the output operation, this outcome would only occur if the index update happened before the read, which is not the actual sequence described by the provided arrangement here. Therefore, 30.3 is unlikely in the given swap configuration.
- Option '5.3': This corresponds to the second element of the list when using 1-based indexing (list order: 40.2, 5.3, 6.2, 30.3, 2.5, 7.5, 65.5). If the first button click reads the current index before any update due to the swapped arrangement, or if the swap results in the read happening while the index still points to the second element, 5.3 becomes the displayed value. In the specific swapped setup described, this is the value that can appear on the first click.
- Option '6.2': This is the third element in a 1-based list. It would require the index to be at 3 at the moment of reading. With the swap, the timing of when the read happens relative to the index update determines whether you see 6.2 or another element; however, the given configuration yields 5.3 on the first click, not 6.2.
- Option '40.2': This is the first element. If the code read before any index adjustment (the non-swapped order) you’d expect 40.2, but the prompt explicitly states the IF-statement and the output assignment are swapped, which changes the immediate reading behavior. Therefore, 40.2 is not the value observed on the first click under the swapped arrangement.
- Option '2.5': This is the fifth element in the list. Reaching 2.5 would require the index to advance further, or the read to happen after multiple updates, which does not occur on the very first click given the swap.

Putting the pieces together, the swapped order causes the display to reflect a different element on the very first click than in the normal order. Among the listed options, the value that aligns with the swapped-start behavior for the first click is 5.3.

In summary, analyzing the list order, how indexing starts, and how the swap alters the timing of the read vs. index update shows that the first-click display matches 5.3 rather than the other choices. The remaining options correspond to other positions in the list or require a different sequence of operations that the swapped layout does not produce on the first click.

CS_005_001_25W Homework 5: Lists

Evaluate the code snippet. Now, the IF-statement and the 'outputLabel' statements are swapped. What is the value displayed by the 'outputLabel' after 1 button click?

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关于列表的使用，以下哪项陈述是准确的？

列表是可变的。

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