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## Postfix to Infix Conversion MCQs

**1. Which of the following data structure is used to convert postfix expression to infix expression?**

a) Stack

b) Queue

c) Linked List

d) Heap

**Answer: **Stack

**2. The postfix expression abc+de/*- is equivalent to which of the following infix expression?**

a) abc+-de*/

b) (a+b)-d/e*c

c) a-(b+c)*(d/e)

d) abc+*-(d/e)

**Answer: **a-(b+c)*(d/e)

**3. The equivalent infix expression and value for the postfix form 1 2 + 3 * 4 5 * – will be**

a) 1 + 2 * 3 – 4 * 5 and -13

b) (2 + 1) * (3 – 4) * 5 and 13

c) 1 + 2 * (3 – 4) * 5 and -11

d) (1 + 2) * 3 – (4 * 5) and -11

**Answer: **(1 + 2) * 3 – (4 * 5) and -11

**4. What is the value of the postfix expression 2 3 + 4 5 6 – – ***

a) 19

b) 21

c) -4

d) 25

**Answer: **25

**5. The prefix expression of the postfix expression AB+CD-* is __________**

a) (A+B)*(C-D)

b) +AB*-CD

c) A+*BCD-

d) *+AB-CD

**Answer: ***+AB-CD

**6. Consider the postfix expression 4 5 6 a b 7 8 a c, where a, b, c are operators. Operator a has higher precedence over operators b and c. Operators b and c are right associative. Then, equivalent infix expression is**

a) 4 a 5 6 b 7 8 a c

b) 4 a 5 c 6 b 7 a 8

c) 4 b 5 a 6 c 7 a 8

d) 4 a 5 b 6 c 7 a 8

**Answer: **4 b 5 a 6 c 7 a 8

**7. To convert the postfix expression into the infix expression we use stack and scan the postfix expression from left to right.**

a) True

b) False

**Answer: **True

**8. Which of the following is valid reverse polish expression?**

a) a op b

b) op a b

c) a b op

d) both op a b and a b op

**Answer: **a b op

**9. The result of the postfix expression 5 3 * 9 + 6 / 8 4 / + is _____________**

a) 8

b) 6

c) 10

d) 9

**Answer: **6

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