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MCQ

Consider the following operation performed on a stack of size 5.
Push(1);
Pop();
Push(2);
Push(3);
Pop();
Push(4);
Pop();
Pop();
Push(5);

After the completion of all operation, the number of elements present in stack are

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The prefix form of an infix expression p + q − r t* is

+ pq − rt

− +pqr t*

− +pq*rt

- +*pqrt

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MCQ

Select the code snippet which returns the top of the stack.

public int top()
{
       if(q1.size()>0)
       {
            return q1.poll();
       }
       else if(q2.size()>0)
       {
            return q2.poll();
       }
       return 0;
}

public int top()
{
       if(q1.size()==0)
       {
            return q1.peek();
       }
       else if(q2.size()==0)
       {
            return q2.peek();
       }
        return 0;
    }

public int top()
{
       if(q1.size()>0)
       {
            return q1.peek();
       }
       else if(q2.size()>0)
       {
            return q2.peek();
       }
       return 0;
}

public int top()
{
       if(q1.size()>0)
       {
            return q2.peek();
       }
       else if(q2.size()>0)
       {
            return q1.peek();
       }
       return 0;
}

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MCQ

The prefix form of A-B/ (C * D ^ E) is,

-/*^ACBDE

-ABCD*^DE

-A/B*C^DE

-A/BC*^DE

Discussion

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The prefix of (A+B)*(C-D)/E*F is:

/+-AB*CD

/*+-ABCD*EF

*/*+AB-CDEF

**AB+CD/EF

Discussion

MCQ

The data structure required to check whether an expression contains balanced parenthesis is

Stack

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Arrays

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Trees

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Heaps

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Graphs

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Engineering

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category More Data Structure Topics

Data Structure Basics

Abstract data types

Arrays

Lists

Stacks

Queues

Trees

Binary Trees

B Trees

Heaps

Hash based structures

Graphs

Mixed

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Community Discussion

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