Q21,paper2 ,D13. What is the value of the postfix expression ? a b c d + – ∗ (where a = 8, b = 4, c = 2 and d = 5)

(A) –38

(B) –83

(C) 24

 (D) –24

Answer D.

Explanation.

Push 8

Push 4.

Push 2.

Push 5. Stack contents are (8425).

Read +, pop two elements , do operation , and push in the stack. Stack is(847).

Read -,Pop two elements ,do operation (4-7=-3), push three in stack. Stack is(8,-3).

Read *, Pop two elements ,do operation (=-24), push three in stack. Stack is(-24).

Answer is -24