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# Data Structures :: Stacks

Home > Data Structures > Stacks > General Questions

21. The postfix form of the expression (A+ B)*(C*D-E)*F / G is

Explanation:

According to left to right associativity

(AB+)*(CD*E-)*F/G

(AB+)(CD*E-)**F/G

Multiplication will be executed first due to left-right associativity

so, (AB+)(CD*E-)*F* /G

(AB+)(CD*E-)*F*G/

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22. he data structure required to check whether an expression contains balanced parenthesis is

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23. Let ' s' be a stack and push and pop be functions implementing the Insertion and Deletion operations in a Stack. push takes 2 parameters: the stack and the element to be inserted , pop takes a single parameter: the stack. What will be the contents of the stack after the following operations: push(s,A), push(s,B), push(s,C), pop(s), pop(s), push(s, D), push (s, E), pop(s) ?

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24. Minimum how many stacks are needed to implement a queue ?

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25. The following name does not relate to stacks

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26. The term "push" and "pop" is related to the

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27. The post fix form of A & B * C-D + E/F/ (G + H) is

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28. The post fix form of A-BI (C* D \$ E) is

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29. The prefix of (A+ B) * (C-D) is

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30. The post fix form of the following prefix * +AB-CD is

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