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Data Structure – Technical interview questions

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?
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 is a data structure?
What does abstract data type means?
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
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 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 in order, preorder and post order 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 ordered set of elements in an array or a sequential search of the elements.

Knowing all basic questions you can prepare these questions and can attend technical interviews confidently.
Hope these questions will help you getting your dream job!

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Aptitude Test Practice Questions - With Answers

Question 1. Which of the following is least like the others?
A.    cube
B.    sphere
C.    pyramid
D.    circle

D (because the circle is the only two-dimensional figure)

Question 2. Consider a language which uses the following set of characters:
Small set: { a b c }
Large set: { A B C }
Punctuation set: { x y }
This language must follow the following rules:
  1.    A punctuation character must end all series.
  2.    A series can have up to but no more than 4          characters,including punctuation characters.

Does the following series follow all the rules of the language defined above?
  A.    Yes
  B.    No

A (the series has only four characters and ends in a punctuation character)

Question 3. Consider the following flow chart for a customer:

The person in No.1 is:
    A.   Married, with children
    B.   Married, with at least one son
    C.   Unmarried, with at least one daughter
    D.   Unmarried, with at least one son
    E.   Unmarried, with no children