Question at position 6 Consider the following code segment. If n has been declared as an integer with the value 4, what is printed as a result of executing the code segment?0 1 2 30 1 2 2 3 3 30 1 1 2 2 2 3 3 3 30 0 1 0 1 2 0 1 2 3单项选择题
A
0 1 2 3
B
0 1 2 2 3 3 3
C
0 1 1 2 2 2 3 3 3 3
D
0 0 1 0 1 2 0 1 2 3

Question

Question at position 6 Consider the following code segment. If n has been declared as an integer with the value 4, what is printed as a result of executing the code segment?0 1 2 30 1 2 2 3 3 30 1 1 2 2 2 3 3 3 30 0 1 0 1 2 0 1 2 3单项选择题

A

0 1 2 3

B

0 1 2 2 3 3 3

C

0 1 1 2 2 2 3 3 3 3

D

0 0 1 0 1 2 0 1 2 3

BlackTom AI · Accepted Answer

Each iteration of the inner loop prints the value of outer, and inner runs from 0 up to outer inclusive. Key concepts: nested for-loops, loop bounds, and how many times a statement inside the inner loop executes.

Relevant knowledge points:
- Outer loop: for (int outer = 0; outer < n; outer++) — with n = 4, outer takes values 0, 1, 2, 3.
- Inner loop: for (int inner = 0; inner <= outer; inner++) — for a given outer value k, inner iterates from 0 to k inclusive, so it executes (k + 1) times.
- System.out.print(outer + " ") prints the current outer value each time the inner loop body runs.

Step-by-step reasoning and intermediate steps:
1. outer = 0: inner runs 0..0 → 1 iteration. Printed values: 0
2. outer = 1: inner runs 0..1 → 2 iterations. Printed values: 1 1
3. outer = 2: inner runs 0..2 → 3 iterations. Printed values: 2 2 2
4. outer = 3: inner runs 0..3 → 4 iterations. Printed values: 3 3 3 3

Concatenate all printed values in execution order: 
0  (from outer=0)
1 1  (from outer=1)
2 2 2  (from outer=2)
3 3 3 3  (from outer=3)
Resulting sequence: 0 1 1 2 2 2 3 3 3 3

Why the correct choice is correct:
- The number k appears exactly (k + 1) times because the inner loop runs that many iterations for outer = k, and the code prints outer inside the inner loop.

Why the other options are incorrect:
- "0 1 2 3" would be printed only if the inner loop executed exactly once per outer (or if the code printed outer only once per outer).
- "0 1 2 2 3 3 3" neither matches the required multiplicities nor the order.
- "0 0 1 0 1 2 0 1 2 3" would be produced if the code printed inner instead of outer (printing inner from 0 up to outer for each outer).

Conclusion: the output is 0 1 1 2 2 2 3 3 3 3, which matches the provided correct answer.

Question at position 6 Consider the following code segment. If n has been declared as an integer with the value 4, what is printed as a result of executing the code segment?0 1 2 30 1 2 2 3 3 30 1 1 2 2 2 3 3 3 30 0 1 0 1 2 0 1 2 3单项选择题

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