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

[@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🙏🙏🙏

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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 .

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At struct datatype after} semicolon is required

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[@ForgotToExist]

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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Video not only is good but also teacher which teach,she is very amazing

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Thank you jenny ma'am for this amazing lecture.

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best lectures ever on Data structures and algorithms

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[@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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grateful for this 🙏 🙏

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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.

[@babon_zia]

Thanks for letting me understand the queue concisely.

[@vaishnavijasutkar8480]

Your teaching is best. Mam plz make videos of c programming also.

[@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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[@maherinamdar2373]

Excellent teaching ma'am👌❤

[@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

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[@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; }

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[@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 ?

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Great Explanation.......

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Mind Blowing Explanation Maam thank you :))

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Crystal Clear.Thank You Very Much!!

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Very easily explained 👌

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Thank you so much 🙏 madam

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[@angelriu3768]

Basically you have written the code of insertion from end and deletion from beginning in singly linked list by using tail pointer.....

[@coderssknowledge8342]

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

[@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

[@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.

[@HarithaSree14]

Awesome mam....Helps a lot

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[@PrabhatKumar-jl3se]

thank you ma'am!!!!!

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Absolutely genious mam

[@thecloudterminal]

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[@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

[@starkgamex4925]

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

[@rohitborra2507]

beautiful and very clear

[@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.

[@mirtanvirahmed3868]

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

[@gopavaramsaimadhuree520]

Very clear ma'am Thank you ma'am ❤️🙏

[@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;

[@alokshukla1223]

Thank you ma'am ! That was really very helpful.

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Great 🤓

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Thanks Jenny Maam

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Mam God bless u

[@akashprince_07]

Where should I put void main function in program that should place in first or last ??

[@cristianandresvargasgonzal4510]

Very thanks is cool, this video.

[@nishanthulwan1478]

Hello why are you assigning front and rear as 0 ? 0 can be a valid node instead of assigning it as 0 can we assign it as NULL? thanks.

[@continnum_radhe-radhe]

🔥🔥🔥