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國立中央大學 2026 · 考試 · 第 7 題

How do we use a stack structure when evaluating postfix expressions (e.g., 3 4 + 5 * 7 / 2 -)?

(A)
When encountering an operand, push; when encountering an operator, pop two numbers. Perform the operation on the two numbers and then push the result.
(B)
When encountering an operator, use Push; when encountering an operand, use Pop.
(C)
Push all operands and operators encountered, and then calculate again at the end.
(D)
This requires using columns, not stacks.

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