What will be output by the following pseudocode if the number 10 is input as X?

Question

BlackTom AI · Accepted Answer

The while-loop condition X <= 10 immediately determines which branch runs and how many iterations occur.

1. Relevant knowledge points and concepts
- While loop executes as long as its condition is true.
- If/Else chooses one assignment for Y depending on X < 10 or not.
- After each loop iteration X is incremented by 1, then the loop condition is re-evaluated.
- The final Print Y prints the last value assigned to Y.

2. Step-by-step reasoning
- Initial input: X = 10.
- Check While X <= 10: since 10 <= 10 is true, enter the loop.
- Inside loop evaluate If X < 10: since 10 < 10 is false, go to Else branch.
- Execute Else branch: Y = X * X.
- Then execute the increment X = X + 1.
- End of iteration; re-evaluate While condition.

3. Intermediate calculations shown
- Else branch calculation: Y = X * X = 10 * 10 = 100.
- Increment: X = 10 + 1 = 11.
- Next loop check: X <= 10 → 11 <= 10 is false, exit loop.

4. Why the correct answer is correct
- The loop runs exactly once for X = 10. The Else branch computes the square, producing Y = 100. Nothing later changes Y, so Print Y outputs 100.

5. Why the other choices are incorrect
- a. 10: This would be X itself, but the code either doubles X (when X<10) or squares it (when X=10); it does not print X.
- b. 0: No operation sets Y to 0 in the code.
- d. 20: That would be 2*10, which would happen only if the If branch (Y = X + X) ran; but that branch requires X < 10, not X = 10.

6. Conclusion
- The program prints 100, so the correct choice is c. 100 (matches the provided answer).

What will be output by the following pseudocode if the number 10 is input as X?单项选择题

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