Q29,paper 2,J13. The value of postfix expression : 8 3 4 + – 3 8 2 / + * 2 $ 3 + is

(A) 17

(B) 131

(C) 64

(D) 52

Answer. D.                                           

Explanation.

Push 8,3,4 in a stack  (834*), 4 is the top.

Read op + , pop top element, calculate  3+4 and push in stack. Stack is (8,7*).

Read op - , pop top elements. Calculate 8-7 and push in stack. Stack is(1*)

Read 3,8,2 and push(3) push 8 and push 2. Stack is (1,3,8,2*)

Read /. Pop two elements operate them and push in stack.Stack is (1,3,4*).

Read +. Pop two elements operate them and push in stack.Stack is (1,7*).

Read *. Pop two elements operate them and push in stack.Stack is (7*).

Push 2.Stack is (7,2*).

Read $, Pop two elements operate them and push in stack.Stack is (49*).

Push 3 . stack is(49,3).

Read + Pop two elements operate them and push in stack.Stack is 52).