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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