GATE CS 2015 Set 3 — Question 28
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Programming & Data Structures → Stacks & Queues → Expression Evaluation
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Question
The result evaluating the postfix expression 10 5 + 60 6 / * 8 - is
Correct answer
(C) 142
Solution
To evaluate the postfix expression "10 5 + 60 6 / * 8 -", we use a stack:
1.Read 10, push 10. Stack: [10]
2.Read 5, push 5. Stack: [10, 5]
3.Read +, pop 5 and 10, compute . Push 15. Stack: [15]
4.Read 60, push 60. Stack: [15, 60]
5.Read 6, push 6. Stack: [15, 60, 6]
6.Read /, pop 6 and 60, compute . Push 10. Stack: [15, 10]
7.Read *, pop 10 and 15, compute . Push 150. Stack: [150]
8.Read 8, push 8. Stack: [150, 8]
9.Read -, pop 8 and 150, compute . Push 142. Stack: [142]
The final result is 142.Therefore, the correct option is (C).Continue learning with Success Tracker
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