(where A = 5, B = 3, C = 5, D= 4, and E= 2)

Algo :

1) If operand is encountered, push it onto Stack

[End If]

2) If operator is encountered, Pop two elements

i) A -> Top element

ii) B-> Next to Top element

iii) Evaluate B operator A

push B operator A onto Stack

2) Set result = pop

Putting the values

Postfix : 5, 3, -, 5, 4, +, 2, *, +

stack

5

stack

3

5

stack

2

stack

5

2

stack

4

5

2

stack

9

2

stack

2

9

2

stack

18

2

stack

20

Output : 20