試題詳解

2. Consider a pair of corresponding infix and postfix arithmetic expressions. Which of the following statements is true?
(A) In a postfix expression, the order of operators is from high to low precedence.
(B) The infix and postfix expressions always have the same number of parentheses.
(C) The infix and postfix expressions always have the same order of operands.
(D) A priority queue for the operators is required when evaluating a postfix expression.
(E) All of the above.