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Computer Science and Engineering Materials-Free Download

1. What is data structure?

The logical and mathematical model of a particular organization of data is called data structure. There are two types of data structure 



2. What are the goals of Data Structure?

It must rich enough in structure to reflect the actual relationship of data in real world.

The structure should be simple enough for efficient processing of data.

3. What does abstract Data Type Mean?

Data type is a collection of values and a set of operations on these values. Abstract data type refer to the mathematical concept that define the data type.It is a useful tool for specifying the logical properties of a data type.ADT consists of two parts 

1.Values definition

2.Operation definition 

4. What is the difference between a Stack and an Array?

1. Stack is a ordered collection of items

2. Stack is a dynamic object whose size is constantly changing as items are pushed and popped .

3. Stack may contain different data types

4. Stack is declared as a structure containing an array to hold the element of the stack, and an integer to indicate the current stack top within the array. 


• Array is an ordered collection of items

• Array is a static object i.e. no of item is fixed and is assigned by the declaration of the array

• It contains same data types.

• Array can be home of a stack i.e. array can be declared large enough for maximum size of the stack. 

5. What do you mean by recursive definition?

The definition which defines an object in terms of simpler cases of itself is called recursive definition. 

6. What is sequential search?

In sequential search each item in the array is compared with the item being searched until a match occurs. It is applicable to a table organized either as an array or as a linked list. 

7. What actions are performed when a function is called?

When a function is called

i) arguments are passed

ii) local variables are allocated and initialized

ii) transferring control to the function

8. What actions are performed when a function returns?

i) Return address is retrieved

ii) Function’s data area is freed

iii) Branch is taken to the return address

9. What is a linked list?

A linked list is a linear collection of data elements, called nodes, where the linear order is given by pointers. Each node has two parts first part contain the information of the element second part contains the address of the next node in the list. 

10. What are the advantages of linked list over array (static data structure)?

The disadvantages of array are

1. unlike linked list it is expensive to insert and delete elements in the array

2. One can’t double or triple the size of array as it occupies block of memory space.

In linked list

1. each element in list contains a field, called a link or pointer which contains the address of the next element

2. Successive element’s need not occupy adjacent space in memory.

11. Can we apply binary search algorithm to a sorted linked list, why?

No we cannot apply binary search algorithm to a sorted linked list, since there is no way of indexing the middle element in the list. This is the drawback in using linked list as a data structure. 

12. What do you mean by free pool?

Pool is a list consisting of unused memory cells which has its own pointer.

13. What do you mean by garbage collection?

It is a technique in which the operating system periodically collects all the deleted space onto the free storage list.It takes place when there is minimum amount of space left in storage list or when "CPU" is ideal.The alternate method to this is to immediately reinsert the space into free storage list which is time consuming. 

14. What do you mean by overflow and underflow?

• When new data is to be inserted into the data structure but there is no available space i.e. free storage list is empty this situation is called overflow. 

• When we want to delete data from a data structure that is empty this situation is called underflow. 

15. What are the disadvantages array implementations of linked list?

1.The no of nodes needed can’t be predicted when the program is written.

2.The no of nodes declared must remain allocated throughout its execution

16. What is a queue?

A queue is an ordered collection of items from which items may be deleted at one end (front end) and items inserted at the other end (rear end).It obeys FIFO rule there is no limit to the number of elements a queue contains. 

17. What is a priority queue?

The priority queue is a data structure in which the intrinsic ordering of the elements (numeric or alphabetic)

Determines the result of its basic operation. It is of two types

i) Ascending priority queue- Here smallest item can be removed (insertion is arbitrary)

ii) Descending priority queue- Here largest item can be removed (insertion is arbitrary)

18. What are the disadvantages of sequential storage?

1.Fixed amount of storage remains allocated to the data structure even if it contains less element.

2.No more than fixed amount of storage is allocated causing overflow

19. What are the disadvantages of representing a stack or queue by a linked list?

i) A node in a linked list (info and next field) occupies more storage than a corresponding element in an array.

ii) Additional time spent in managing the available list.

20. What is dangling pointer and how to avoid it?

• After a call to free(p) makes a subsequent reference to *p illegal, i.e. though the storage to p is freed but the value of p(address) remain unchanged .so the object at that address may be used as the value of *p (i.e. there is no way to detect the illegality).Here p is called dangling pointer. 

• To avoid this it is better to set p to NULL after executing free(p).The null pointer value doesn’t reference a storage location it is a pointer that doesn’t point to anything. 

21. What are the disadvantages of linear list?

i) We cannot reach any of the nodes that precede node (p)

ii) If a list is traversed, the external pointer to the list must be persevered in order to reference the list again 

22. Define circular list?

In linear list the next field of the last node contain a null pointer, when a next field in the last node contain a pointer back to the first node it is called circular list. Advantages – From any point in the list it is possible to reach at any other point 

23. What are the disadvantages of circular list?

i) We can’t traverse the list backward

ii) If a pointer to a node is given we cannot delete the node

24. Define double linked list?

It is a collection of data elements called nodes, where each node is divided into three parts

i) An info field that contains the information stored in the node

ii) Left field that contain pointer to node on left side

iii) Right field that contain pointer to node on right side

25. Is it necessary to sort a file before searching a particular item ?

If less work is involved in searching a element than to sort and then extract, then we don’t go for sort

If frequent use of the file is required for the purpose of retrieving specific element, it is more efficient to sort the file.Thus it depends on situation. 

26. What are the issues that hamper the efficiency in sorting a file?

The issues are

i) Length of time required by the programmer in coding a particular sorting program

ii) Amount of machine time necessary for running the particular program

iii)The amount of space necessary for the particular program .

27. Calculate the efficiency of sequential search?

The number of comparisons depends on where the record with the argument key appears in the table

1. If it appears at first position then one comparison

2. If it appears at last position then n comparisons

3. Average=(n+1)/2 comparisons

4. Unsuccessful search n comparisons

5. Number of comparisons in any case is O (n).

28. Is any implicit arguments are passed to a function when it is called?

Yes there is a set of implicit arguments that contain information necessary for the function to execute and return correctly. One of them is return address which is stored within the function’s data area, at the time of returning to calling program the address is retrieved and the function branches to that location. 

29. Parenthesis is never required in Postfix or Prefix expressions, why?

Parenthesis is not required because the order of the operators in the postfix /prefix expressions determines the actual order of operations in evaluating the expression 

30. List out the areas in which data structures are applied extensively?

1. Compiler Design,

2. Operating System,

3. Database Management System,

4. Statistical analysis package,

5. Numerical Analysis,

6. Graphics,

7. Artificial Intelligence,

8. Simulation

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