Wednesday, August 4, 2010

DataStructures


Data  Structure Questions

     
  1. What is a data structure?
  2.  
  3. What does abstract       data type means?
  4.  
  5. Evaluate the       following prefix expression  " ++ 26 + - 1324" (Similar       types can be asked)
  6.  
  7. Convert the       following infix expression to post fix notation  ((a+2)*(b+4))       -1  (Similar types can be asked)
  8.  
  9. How is it possible       to insert different type of elements in stack?
  10.  
  11. Stack can be       described as a pointer. Explain.
  12.  
  13. Write a Binary       Search program
  14.  
  15. Write programs for       Bubble Sort, Quick sort
  16.  
  17. Explain about the       types of linked lists
  18.  
  19. How would you sort       a linked list?
  20.  
  21. Write the programs       for Linked List (Insertion and Deletion) operations
  22.  
  23. What data structure       would you mostly likely see in a non recursive implementation of a       recursive algorithm?
  24.  
  25. What do you mean by       Base case, Recursive case, Binding Time, Run-Time Stack and Tail       Recursion?
  26.  
  27. Explain quick sort       and merge sort algorithms and derive the time-constraint relation for       these.
  28.  
  29. Explain binary       searching, Fibinocci search.
  30.  
  31. What is the maximum       total number of nodes in a tree that has N levels? Note that the root is       level (zero)
  32.  
  33. How many different       binary trees and binary search trees can be made from three nodes that       contain the key values 1, 2 & 3?
  34.  
  35. A list is ordered       from smaller to largest when a sort is called. Which sort would take the       longest time to execute?
  36.  
  37. A list is ordered       from smaller to largest when a sort is called. Which sort would take the       shortest time to execute?
  38.  
  39. When will you        sort an array of pointers to list elements, rather than sorting the       elements themselves?
  40.  
  41. 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?
  42.  
  43. 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?
  44.  
  45. Which sort show the       best average behavior?
  46.  
  47. What is the average       number of comparisons in a sequential search?
  48.  
  49. Which data       structure is needed to convert infix notations to post fix notations?
  50.  
  51. What do you mean       by:
  52.  
         
    • Syntax Error
    •    
    • Logical Error
    •    
    • Runtime Error
    •  

How can you correct these errors?

     
  1. In which data structure, elements can be added or       removed at either end, but not in the middle?
  2.  
  3. How will inorder,       preorder and postorder traversals print the elements of a tree?
  4.  
  5. Parenthesis are       never needed in prefix or postfix expressions. Why?
  6.  
  7. Which one is       faster? A binary search of an orderd set of elements in an array or a       sequential search of the elements.

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