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Question

How many PUSH and POP operations will be needed to evaluate the following expression by reverse polish notation in a stack machine (A * B) + (C * D/E)?

a.

4 PUSH and 3 POP instructions

b.

5 PUSH and 4 POP instructions

c.

6 PUSH and 2 POP instructions

d.

5 PUSH and 3 POP instructions

Answer: (b).5 PUSH and 4 POP instructions

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Q. How many PUSH and POP operations will be needed to evaluate the following expression by reverse polish notation in a stack machine (A * B) + (C * D/E)?

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