What is a data structure?

What does abstract data type means?
Evaluate the following prefix expression " ++ 26 + -
1324" (Similar types can be asked)
Convert the following infix expression to post fix
notation ((a+2)*(b+4)) -1 (Similar types can be asked)
How is it possible to insert different type of elements
in stack?
Stack can be described as a pointer. Explain.
Write a Binary Search program
Write programs for Bubble Sort, Quick sort
Explain about the types of linked lists
How would you sort a linked list?
Write the programs for Linked List (Insertion and
Deletion) operations
What data structure would you mostly likely see in a non
recursive implementation of a recursive algorithm?
What do you mean by Base case, Recursive case, Binding
Time, Run-Time Stack and Tail Recursion?
Explain quick sort and merge sort algorithms and derive
the time-constraint relation for these.
Explain binary searching, Fibinocci search.
What is the maximum total number of nodes in a tree that
has N levels? Note that the root is level (zero)
How many different binary trees and binary search trees
can be made from three nodes that contain the key
values 1, 2 & 3?
A list is ordered from smaller to largest when a sort is
called. Which sort would take the longest time to
execute?
A list is ordered from smaller to largest when a sort is
called. Which sort would take the shortest time to
execute?
When will you sort an array of pointers to list elements,
rather than sorting the elements themselves?
The element being searched for is not found in an array
of 100 elements. What is the average number of
comparisons needed in a sequential search to determine
that the element is not there, if the elements are
completely unordered?
What is the average number of comparisons needed in a
sequential search to determine the position of an
element in an array of 100 elements, if the elements
are ordered from largest to smallest?
Which sort show the best average behavior?
What is the average number of comparisons in a sequential
search?
Which data structure is needed to convert infix notations
to post fix notations?
What do you mean by:
·Syntax Error
·Logical Error
·Runtime Error
How can you correct these errors?
In which data structure, elements can be added or removed
at either end, but not in the middle?
How will inorder, preorder and postorder traversals print
the elements of a tree?
Parenthesis are never needed in prefix or postfix
expressions. Why?
Which one is faster? A binary search of an orderd set of
elements in an array or a sequential search of the
elements.