this presentation is made for the students who finds data structures a complex subject
this will help students to grab the various topics of data structures with simple presentation techniques
best regards
BCA group
(pooja,shaifali,richa,trishla,rani,pallavi,shivani)
this presentation is made for the students who finds data structures a complex subject
this will help students to grab the various topics of data structures with simple presentation techniques
best regards
BCA group
(pooja,shaifali,richa,trishla,rani,pallavi,shivani)
Queue is an abstract data structure, somewhat similar to Stacks. Unlike stacks, a queue is open at both its ends. One end is always used to insert data (enqueue) and the other is used to remove data (dequeue). Queue follows First-In-First-Out methodology, i.e., the data item stored first will be accessed first.
Application of Stack For Expression Evaluation by Prakash Zodge DSY 41.pptxPrakash Zodge
In short...The stack organization is very effective in evaluating arithmetic expressions. Expressions are usually represented in what is known as Infix notation, in which each operator is written between two operands (i.e., A + B)....
https://github.com/ashim888/dataStructureAndAlgorithm
Stack
Concept and Definition
• Primitive Operations
• Stack as an ADT
• Implementing PUSH and POP operation
• Testing for overflow and underflow conditions
Recursion
• Concept and Definition
• Implementation of:
¬ Multiplication of Natural Numbers
¬ Factorial
¬ Fibonacci Sequences
The Tower of Hanoi
Data structure Stack presentation for university student .this presentation created by "Sheikh-Monirul-Hasan " in Department of computer science at Green University of Bangladesh.
Introduction to ibm pc assembly languagewarda aziz
The Solution manual of COAL
Chapter NO 4. exercise
if anyone has Questions Regarding this exercise.
contact me on my given Email-ID.
i will guide you. Thank you!
Queue is an abstract data structure, somewhat similar to Stacks. Unlike stacks, a queue is open at both its ends. One end is always used to insert data (enqueue) and the other is used to remove data (dequeue). Queue follows First-In-First-Out methodology, i.e., the data item stored first will be accessed first.
Application of Stack For Expression Evaluation by Prakash Zodge DSY 41.pptxPrakash Zodge
In short...The stack organization is very effective in evaluating arithmetic expressions. Expressions are usually represented in what is known as Infix notation, in which each operator is written between two operands (i.e., A + B)....
https://github.com/ashim888/dataStructureAndAlgorithm
Stack
Concept and Definition
• Primitive Operations
• Stack as an ADT
• Implementing PUSH and POP operation
• Testing for overflow and underflow conditions
Recursion
• Concept and Definition
• Implementation of:
¬ Multiplication of Natural Numbers
¬ Factorial
¬ Fibonacci Sequences
The Tower of Hanoi
Data structure Stack presentation for university student .this presentation created by "Sheikh-Monirul-Hasan " in Department of computer science at Green University of Bangladesh.
Introduction to ibm pc assembly languagewarda aziz
The Solution manual of COAL
Chapter NO 4. exercise
if anyone has Questions Regarding this exercise.
contact me on my given Email-ID.
i will guide you. Thank you!
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2. Last Lecture Summary
• Notations
• Prefix, Infix and Postfix Notations
• Conversion of one type expression to another
• Evaluation of Prefix and Postfix Notations
3. Objectives Overview
• Introduction to Queue Data Structure
• Types of Queue Data Structures
• Circular QUEUE and its Operations
• Double Ended QUEUE and its operations
4. What is a queue?
• It is an ordered group of homogeneous items of elements.
• Queues have two ends:
▫ Elements are added at one end.
▫ Elements are removed from the other end.
• The element added first is also removed first (FIFO: First In, First Out).
5. Types of Queue
• Queue is an abstract data type which can be implemented
as a linear or circular list. It has a front and rear.
Types of Queue:
1. Simple Queue
2. Circular Queue
3. Dequeue (Double Ended Queue)
6. Operations on Queue
• Mainly the following four basic operations are performed
on queue:
• Enqueue: Adds an item to the queue. If the queue is full,
then it is said to be an Overflow condition.
• Dequeue: Removes an item from the queue. The items
are popped in the same order in which they are pushed. If
the queue is empty, then it is said to be an Underflow
condition.
• Front: Get the front item from queue.
• Rear: Get the last item from queue.
7. Queue Specification
• Definitions: (provided by the user)
▫ MAX_ITEMS: Max number of items that might be on
the queue
▫ ItemType: Data type of the items on the queue
• Operations
– MakeEmpty
– Boolean IsEmpty
– Boolean IsFull
– Enqueue (ItemType newItem)
– Dequeue (ItemType)& item)
11. Enqueue (ItemType newItem)
• Function: Adds newItem to the rear of the queue.
• Preconditions: Queue has been initialized and is
not full.
• Postconditions: newItem is at rear of queue.
12. Enqueue Algorithm
• Step 1 − Check if the queue is full.
• Step 2 − If the queue is full, produce overflow error
and exit.
• Step 3 − If the queue is not full, increment rear
pointer to point the next empty space.
• Step 4 − Add data element to the queue location,
where the rear is pointing.
• Step 5 − return success.
14. Dequeue (ItemType& item)
• Function: Removes front item from queue and
returns it in item.
• Preconditions: Queue has been initialized and is not
empty.
• Postconditions: Front element has been removed
from queue and item is a copy of removed element.
15. Dequeue Algorithm
• Step 1 − Check if the queue is empty.
• Step 2 − If the queue is empty, produce underflow
error and exit.
• Step 3 − If the queue is not empty, access the data
where front is pointing.
• Step 4 − Increment front pointer to point to the next
available data element.
• Step 5 − Return success.
17. Implementation issues
• Implement the queue as a circular structure.
• How do we know if a queue is full or empty?
• Initialization of front and rear.
• Testing for a full or empty queue.
18.
19.
20. Make front point to the element preceding the front element in the
queue (one memory location will be wasted).
23. Queue overflow
• The condition resulting from trying to add an
element onto a full queue.
if(!q.IsFull())
q.Enqueue(item);
24. Queue underflow
• The condition resulting from trying to remove an
element from an empty queue.
if(!q.IsEmpty())
q.Dequeue(item);
25. Circular Queue
private:
int front;
int rear;
ItemType* items;
int maxQue;
};
Circular Queue is a linear data structure in which the
operations are performed based on FIFO (First In First Out)
principle and the last position is connected back to the first
position to make a circle. It is also called ‘Ring Buffer’.
26. Operations on Circular Queue
• Front: Get the front item from queue.
• Rear: Get the last item from queue.
• enQueue(value) This function is used to insert an
element into the circular queue. In a circular queue,
the new element is always inserted at Rear position.
▫ Steps: Check whether queue is Full – Check ((rear ==
SIZE-1 && front == 0) || (rear == front-1)).
▫ If it is full then display Queue is full. If queue is not full
then, check if (rear == SIZE – 1 && front != 0) if it is
true then set rear=0 and insert element.
27. Operations on Circular Queue
• deQueue() This function is used to delete an
element from the circular queue. In a circular queue,
the element is always deleted from front position.
▫ Steps: Check whether queue is Empty means check
(front==-1).
▫ If it is empty then display Queue is empty.
▫ If queue is not empty then step 3
▫ Check if (front==rear) if it is true then set front=rear=-1
▫ else check if (front==size-1), if it is true then set
front=0 and return the element.
28.
29. Circular Queue - Implementation
1. Initialize the queue, with size of the queue defined
(maxSize), and head and tail pointers.
2. enqueue: Check if the number of elements is equal to
maxSize - 1:
a) If Yes, then return Queue is full.
b) If No, then add the new data element to the location of
tail pointer and increment the tail pointer.
3. dequeue: Check if the number of elements in the
queue is zero:
a) If Yes, then return Queue is empty.
b) If No, then increment the head pointer.
4. Finding the size:
a) If, tail >= head, size = (tail - head) + 1
b) But if, head > tail, then size = maxSize - (head - tail) + 1
30. Performance
• Time Complexity: Time complexity of all operations
like enqueue(), dequeue(), isFull(), isEmpty(), front()
and rear() is O(1). There is no loop in any of the
operations.
•
31. Example: Recognizing Palindromes
• A palindrome is a string that reads the same
forward and backward.
Able was I ere I saw Elba
• We will read the line of text into both a stack
and a queue.
• Compare the contents of the stack and the
queue character-by-character to see if they
would produce the same string of characters.
34. while( (!q.IsEmpty()) && (!s.IsEmpty()) ) {
s.Pop(sItem);
q.Dequeue(qItem);
if(sItem != qItem)
++mismatches;
}
if (mismatches == 0)
cout << "That is a palindrome" << endl;
else
cout << That is not a palindrome" << endl;
return 0;
}
Example: Recognizing Palindromes
35. Summary
• Introduction to Queue Data Structure
• Types of Queue Data Structures
• Circular QUEUE and its Operations
• Double Ended QUEUE and its operations