Question

Evaluate following postfix expressions while showing status of stack after the operation given A = 3, B = 5, C = 1, D = 4.

A B * C / D *

Answer 1

A B * C / D *

A = 3, B = 5, C = 1, D = 4

Replacing Literals with Values:

Expression : A B * C / D *

After Substitution Expression: 3 5 * 1 / 4 *

Scanning from left to right

Symbol	Action	Intermediate Process/Output	Stack, Initially Stack is Empty [ ]
3	PUSH(3)		3
5	PUSH(5)		3 5
*	POP twice, Evaluate and PUSH Back	POP( ) => 5 POP( ) => 3 3 * 5 = 15 PUSH(15)	3 [ ] #Empty 15
1	PUSH(1)		15  1
/	POP twice, Evaluate and PUSH Back	POP( ) => 1 POP( ) => 15 15 / 1 = 15 PUSH(15)	15 [ ] #Empty 15
4	PUSH(4)		15 4
*	POP twice, Evaluate and PUSH Back	POP( ) => 4 POP( ) => 15 15 * 4 = 60 PUSH(60)	15 [ ] 60
End of Expression	POP	POP( ) => 60	[ ]
Answer : 60