GATE | GATE CS 1997 | Question 7

Which of the following is essential for converting an infix expression to the postfix from efficiently ?
(A) An operator stack
(B) An operand stack
(C) An operand stack and an operator stack
(D) A parse tree

Answer: (A)

Explanation: Operator stack is used for converting infix to postfix expression such that operators like as +, *, (, ), / are pushed in stack where as operand stack is used for converting Postfix to Prefix evaluation such that operands are 7,2,1,2 etc.

Hence, option (A) is correct.

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