What are the contents of the stack (initially the stack is empty) after the…
2026
What are the contents of the stack (initially the stack is empty) after the following operations?
PUSH (A)
PUSH (B)
PUSH (C)
POP
PUSH (D) ; POP ; POP ;
PUSH (E)
PUSH (F)
POP
- A.
A
- B.
ABCE
- C.
AE
- D.
ABE
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Show answer & explanation
Correct answer: C
A stack follows the Last-In, First-Out (LIFO) principle. Starting with an empty stack: PUSH(A), PUSH(B), and PUSH(C) result in [A, B, C] (bottom to top). The first POP removes C, leaving [A, B]. Next, PUSH(D) creates [A, B, D], followed by two POPs which remove D and then B. The stack now contains only [A]. Finally, PUSH(E) and PUSH(F) result in [A, E, F], and the last POP removes F. The remaining elements from bottom to top are A and E, making AE the correct final state.",