4.3 Queue Implementation using Linked List in C | Data Structure Tutorials

In this lecture I have explained implementation of Queue using Linked List with example. I have written C program for linked list implementation of Queue data structure.
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[@PrinceKumar-ux3qm]

The best thing is that you are making videos on algorithms and data structure, there are lots of channels in youtube they do teach programming languages but not data structure and algorithms.Thanks a lot mam🙏🙏🙏

[@vishnupriyabalakrishnan920]

Q1qq

[@riyajaiswal2137]

I tried this code but its not working ...for linked list and array as well

[@AnkitSingh-go6qq]

@@riyajaiswal2137 yes i also check code is not working if we deque element many times

[@VivekRaj-eb6mk]

@@riyajaiswal2137 that's not code, that the algorithm .

[@urstrulymadhu6390]

At struct datatype after} semicolon is required

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Ma'am never stop making videos....teacher like u are needed are needed more and more in our society....ur explanations are supurb

[@Varun00717]

waking up at 5 am every day. and seeing your face has now become a habit. thank you so much for such lovely explanations and clearing my concept. mam please make two videos on 1. Reverse a circular doubly linked list & 2. Implementation of circular queue using linked list. Thank you mam you are amazing

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Your teaching makes it interesting to listen to you until the end... Because of the clarity and consistency of how you lay out your ideas.

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Mam ur lectures is awesome. To the point,No time wastage!😘😘😘😘😘

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jayanthi ma'am , u r simply superb...
keep helping us
best channel for learning DS

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best youtube tutor mam its uniques and direct point tq :)

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Thank you very much Jenny. You saved me during my C days and now still saving me learning C#.
I see double beauties watching your videos.

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best lectures ever on Data structures and algorithms

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Sabse acche meri pyari ma'am
On of the best TH-cam channel ❤

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Pyaar ho Jaye ga mam, aise padhayenge toh...❤️❤️
.
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DS se

[@saiakshagn3553]

Thank you so much maam.Your way of Teaching is so good that even a dull student can understand easily.Our Generation is so lucky, because We have you.

[@raghavjoshi9751]

Mam in deletion condition their should be one more condition that is
else if(front==rear)
{
printf("deleted element is %d
",temp->data);
front =rear=NULL;
}
cause in last else condition (front= front->next) that make the front to point to the next undefined memory

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Yes, I also noticed...that's why finding in comments

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I used to smoke weeds but at last when you said "bye,bye take care"
I quit it,and made my 10 friends too.
But joke safat it would be a more interactive if you have coded the logic live on IDE ,at last to the point , straight and simple explanation won my heart ♥️♥️

[@PankajPandeyfacts7931]

I struggles a.lot on this topic
But I am clear right now
Thank u mam from the bottom of my heart

[@padalabalaji5432]

mam thanks a lot for teaching in such a simple way that can be understood by a new person to coding like me👏👏

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Mam I am improving my basic knowledge on coding I have so many of doubts on coding but your teaching coding is assume I am easier to learn thank you mam😊

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[@LEETanjubagri]

very nice explanation mam and at last your smile is speechless.......... this motivates me to see the next lecture of u without tiredness.
thank u for giving us your precious time.

[@sharath5796]

note : while dequeue op, first we have to make temp->nxt as null and then free temp

[@justcurious1940]

Do we make a memory address NULL before or after we free it ?

[@cherukurisagarteja151]

You are the most beautiful lecturer in this century

[@babon_zia]

Thanks for letting me understand the queue concisely.

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Great mind with great beauty ✨✨✨✨
Thanks you mam ❤

[@sivasubramani612]

@Jenny, I think at 2:50 sec, we can't consider front at the right end and rear at the left end since this is a singly linked list and after deque (which will take O(n)) we can't change the rear pointer to point the previous node. What do you think? If its right. please give a like so that it will be on top and will help others.

[@pavanbhadane8334]

right brother

[@mohdehtesham8357]

Just one note while running the code as is, the front and rear are globally initialized as NULL, so the functions dequeue(), display() and Peek() will always hit on the first condition. So, there is a need to either initialise the front and rear as local and pass those as arguments to the given functions or update the global pointers to the recent values as a whole.

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[@lks5343]

Nice explanation mam , Thank you.

[@jithinmv6516]

in dequeue you forgot to write the case for a single element, I mean front and rear points to same node, Which means only one element in queue, So we have to do (front=NULL and rear=NULL)

[@karamsingh7785]

That's exactly what i was going too comment

[@arvsaurav]

I think there is one other way i.e., if we will use only front==0 instead of (front==0 and rear==0) at every place.

[@qasimalikhan9692]

else if(head==tail){
std::cout

[@ankitxalxotoo5580]

@@qasimalikhan9692 thanks brother

[@mostafayounes9490]

Best Instructor Ever💯

[@baraamayasa5190]

thanks for your great explanations the data structure more fun and a lot easier with your lessons
in this code there is a little problem when the front and rear pointers referring to same node because front pointer will be null otherwise rear pointer will lost the node but in that situation must refer to null so we need to add that statement to the code.
#include
#include
struct node{
int data;
struct node* next;
};
struct node* front=0;
struct node* rear=0;
void enqueue(int data){
struct node* newNode=(struct node*)malloc(sizeof(struct node));
newNode->data=data;
newNode->next=0;
if(front==0&&rear==0){
front=rear=newNode;
}
else{
rear->next=newNode;
rear=newNode;
}
}
void dequeue(){
struct node* temp=front;
if(front==0&&rear==0){ //&&rear==0
printf("empty queue
");
}
else if(front==rear){
//peek();
front=rear=0;
free(temp);
}
else{
//peek();
front=front->next;
free(temp);
}
}
void display(){
struct node* temp=front;
if(front==0&&rear==0){
printf("empty queue
");
}
else{
while(temp!=0){
printf("%d\t",temp->data);
temp=temp->next;
}
printf("
");
}
}
void peek(){
if(front==0&&rear==0){
printf("empty queue
");
}
else
printf("front data: %d
",front->data);
}
int main()
{
dequeue();
enqueue(5);
enqueue(0);
peek();
enqueue(-3);
display();
dequeue();
dequeue();
dequeue();
dequeue();
enqueue(11);
peek();
display();
return 0;
}

[@neerajanavya4178]

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Great Explanation.......

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Best teacher on YT

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Crystal Clear.Thank You Very Much!!

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And no 1 teach like as you teach🤗

[@sudharsands5773]

Mam, you missed discussing a case in dequeue() i.e,, when front==rear.
When front and rear is point same node

[@justcurious1940]

U will have to update the rear or the whole code will break;

[@AjeetKumar-mo6xt]

i can trust all your videos because your accuracy is around 100 percent

[@riyajaiswal2137]

I tried this code but its not working...linked list and array as well for queue ...both arent working.

[@darpananand9848]

Ma'am we can also check the condition for 1 element in Dequeue Function i.e
if there is only 1 element in the Queue , and we want to delete it , then the code would be
void dequeue()
{
struct node*temp=front;
if(front==0 && rear==0)
{
printf("UnderFlow Condition
");
}
else if(front==rear)
{
printf("The element which is deleted is %d
",front->data);
front=rear=0;
free(temp);
}
else
{
printf("The element which is deleted is %d
",front->data);
front=front->next;
free(temp);
}
}
BTW Thank you so much Ma'am for this Amazing Content ❤❤

[@justcurious1940]

No need if we don't use the rear in the past functions I think .

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Thank you so much 🙏 madam

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[@nitinkhilari1389]

Excellent Teaching Ma'am

[@ducatidiavel9639]

Hello Ma'am, I have 2 questions,
1) Given that the video is about a LL implementation of a linear Q, are there any rules that a circular linked list cannot be used, in place of a singly linked list with 2 pointers?
2) And regarding your statement that a DLL using a head and tail pointer.. A DLL uses Nodes that only have a previous and next pointer right?

[@ayaamverma6742]

1) A circular LL can be used here tho it will also contain the head and tail pointer like the singly LL used here; thus practically we will be using only the semi-circle of the CLL since our enqueuing and dequeuing are restricted between the head and tail pointer. Hence the last pointer of our CLL (from last node to first node) won't be of any use and simply be using memory space. Otherwise using a CLL is as good as singly LL.

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[@coderssknowledge8342]

awesome explanation mam,thanks....,plzz make videos on sorting of linklist.

[@avirupbanerjee3253]

Mam why do we need to specify both front and rear while checking whether the list is empty or not. We can do it using rear only.

[@rahulsrivastava7017]

in dequeue(), there should also be a condition for when there is only 1 element in queue, that is,
else if(front==rear)
{
Node *temp=new Node();
temp=front;
front=NULL;
rear=NULL;
free(temp);
}

[@pavanbhadane8334]

We can just write
free(front)
front=rear=NULL;

[@mohammadismailhossain6435]

😅

[@justcurious1940]

@@pavanbhadane8334 exactly what ChatGPT just told me.

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Mind Blowing Explanation Maam thank you :))

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beautiful and very clear

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Mam thanks for your efforts

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Very easily explained 👌

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I have implemented the logic myself first and then watching the video 😁

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Thank you ma'am ❤️🙏

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Thank you.