Contoh Program Queue Dengan Linked List By tmasechtrocdust1974 Follow Public Pada bahasa pemrograman Java, LinkList merupakan sebuah collection yang digunakan sebagai tempat penyimpanan data yang terdiri dari node-node (simpul-simpul) yang saling terhubung. Contoh Program Queue Dengan Linked List; Contoh Program Queue Dengan Linked List C; This is Node classI used Double LinkedList. this is stack class. This is Queues Class. Kali ini mimin ingin share Contoh Program single linked list dengan C. Sintax kali ini masih sangat sederhana sebab ini request yang san. Contoh Program Queue Dengan Linked List In Word Contoh Program Queue Dengan Linked List Example Program kali ini cukup istimewa karena menggunakan class sebagai dasar dari OOP(Object Oriented Programing) berikut source code dari program queue menggunakan linked list. Ini adalah tugas Struktur Data dari I Wayan Gede Aryarthana atau biasa di panggil Brim 183 maunya tapi sering di panggil Brim aja. Dalam mengerjakan tugas ini I Wayan Gede Aryarthana belajar dari materi materi yang di peroleh dari Internet dalam bentuk file PDF. Untuk itu I Wayan Gede Aryarthana mengucapkan terima kasih kepada sumber sumber yang telah dengan sukarela arsipnya untuk di. Contoh Program Queue Dengan Linked List In Word Contoh Program Queue Dengan Linked List Example Program kali ini cukup istimewa karena menggunakan class sebagai dasar dari OOP(Object Oriented Programing) berikut source code dari program queue menggunakan linked list.
I have some problems that code. I read file in code and build one stack and one queues structure. But the code wasn't run correctly.
This is Node classI used Double LinkedList
** this is stack class. **
This is Queues Class
- Kali ini mimin ingin share Contoh Program single linked list dengan C++. Sintax kali ini masih sangat sederhana sebab ini request yang san.
- Program Implementasi Queue dengan Linked List Program kali ini cukup istimewa karena menggunakan class sebagai dasar dari OOP(Object Oriented Programing) berikut source code dari program queue menggunakan linked list.
This is Queues Class
Struktur data queue (antrian) dapat diimplementasikan dengan menggunakan array maupun linked list sebagai penyimpanan datanya. Dalam contoh program berikut ini saya gunakan double linked list untuk implementasi queue.
1 Answer
Ok, so you have a couple of problems. I'm going to point out a few and let you work to fix the rest because this looks like an assignment and I don't want to do your homework for you :).
First, when you read from the file be careful not to ignore the first element:
Notice that unlike your solution I first do the push y.Push(line) so that we don't forget to add whatever is already read into line. Same goes for the queue file:
Just add it if it's not null and then read the next line. You were always missing on the first element from the file.
Another problem is the Queues class (which by the way is misspelled you should replace O with Q). This one is not working properly because you forgot to increment and decrement the size when you insert or remove.
Notice that at the end of insert I'm increasing the size so that the list method doesn't throw a NullPointerException every time we call it. Same goes for the remove method:
Please also notice that your check before (if(head.nexttail)) was also throwing NullPointerException because at the beginning the head is always null so you cannot access the next member. Finally I've made a small improvement to the list method as well so that we return earlier:
Notice the return if the Queue is empty, otherwise we will attempt to do tail.getNext() which will always throw a NullPointerException.
Some important thoughts about the code in generalPlease avoid weird naming. Why Queues? There is just one so it should be Queue.Please avoid weird variable names. Your code is not just for you, chances are someone else might need to read and it gets hard to know who it is s, y, k, fwy and fwk. Why not naming them like this:
And the same goes for methods . Why Push, Pop and Top are the only methods that start with upper-case letter ? If you don't agree with the standard Java naming convention that is fine but at least be consistent :).
Try the suggested improvements and see how your program it's working. I'm almost sure there are more problems with it. If you can't figure them out yourself leave a comment and I will help you. Good luck!
Not the answer you're looking for? Browse other questions tagged javadata-structures or ask your own question.
A data structure, or abstract data type (ADT), is a model that is defined by a collection of operations that can be performed on itself and is limited by the constraints on the effects of those operations. It creates a wall between what can be done to the underlying data and how it is to be done.
Most of us are familiar with stacks and queues in normal everyday usage, but what do supermarket queues and vending machines have to do with data structures? Let’s find out. In this article I’ll introduce you to two basic abstract data types – stack and queue – which have their origins in everyday usage.
Stacks
In common usage, a stack is a pile of objects which are typically arranged in layers – for example, a stack of books on your desk, or a stack of trays in the school cafeteria. In computer science parlance, a stack is a sequential collection with a particular property, in that, the last object placed on the stack, will be the first object removed. This property is commonly referred to as last in first out, or LIFO. Candy, chip, and cigarette vending machines operate on the same principle; the last item loaded in the rack is dispensed first.
In abstract terms, a stack is a linear list of items in which all additions to (a “push”) and deletions from (a “pop”) the list are restricted to one end – defined as the “top” (of the stack). The basic operations which define a stack are:
- init – create the stack.
- push – add an item to the top of the stack.
- pop – remove the last item added to the top of the stack.
- top – look at the item on the top of the stack without removing it.
- isEmpty – return whether the stack contains no more items.
A stack can also be implemented to have a maximum capacity. If the stack is full and does not contain enough slots to accept new entities, it is said to be an overflow – hence the phrase “stack overflow”. Likewise, if a pop operation is attempted on an empty stack then a “stack underflow” occurs.
Knowing that our stack is defined by the LIFO property and a number of basic operations, notably push and pop, we can easily implement a stack using arrays since arrays already provide push and pop operations.
Here’s what our simple stack looks like:
In this example, I’ve used array_unshift() and array_shift(), rather than array_push() and array_pop(), so that the first element of the stack is always the top. You could use array_push() and array_pop() to maintain semantic consistency, in which case, the Nth element of the stack becomes the top. It makes no difference either way since the whole purpose of an abstract data type is to abstract the manipulation of the data from its actual implementation.
Let’s add some items to the stack:
To remove some items from the stack:
Let’s see what’s at the top of the stack:
What if we remove it?
And if we add a new item?
You can see the stack operates on a last in first out basis. Whatever is last added to the stack is the first to be removed. If you continue to pop items until the stack is empty, you’ll get a stack underflow runtime exception.
Contoh Program Queue Dengan Linked List
Oh, hello… PHP has kindly provided a stack trace showing the program execution call stack prior and up to the exception!
The SPLStack
The SPL extension provides a set of standard data structures, including the SplStack class (PHP5 >= 5.3.0). We can implement the same object, although much more tersely, using an SplStack as follows:
The SplStack class implements a few more methods than we’ve originally defined. This is because SplStack is implemented as a doubly-linked list, which provides the capacity to implement a traversable stack.
A linked list, which is another abstract data type itself, is a linear collection of objects (nodes) used to represent a particular sequence, where each node in the collection maintains a pointer to the next node in collection. In its simplest form, a linked list looks something like this:
Contoh Program Queue Dengan Linked List C++
In a doubly-linked list, each node has two pointers, each pointing to the next and previous nodes in the collection. This type of data structure allows for traversal in both directions.
Nodes marked with a cross (X) denotes a null or sentinel node – which designates the end of the traversal path (i.e. the path terminator).
Since ReadingList is implemented as an SplStack, we can traverse the stack forward (top-down) and backward (bottom-up). The default traversal mode for SplStack is LIFO:
To traverse the stack in reverse order, we simply set the iterator mode to FIFO (first in, first out):
Queues
If you’ve ever been in a line at the supermarket checkout, then you’ll know that the first person in line gets served first. In computer terminology, a queue is another abstract data type, which operates on a first in first out basis, or FIFO. Inventory is also managed on a FIFO basis, particularly if such items are of a perishable nature.
The basic operations which define a queue are:
- init – create the queue.
- enqueue – add an item to the “end” (tail) of the queue.
- dequeue – remove an item from the “front” (head) of the queue.
- isEmpty – return whether the queue contains no more items.
Since SplQueue is also implemented using a doubly-linked list, the semantic meaning of top and pop are reversed in this context. Let’s redefine our ReadingList class as a queue:
SplDoublyLinkedList also implements the ArrayAccess interface so you can also add items to both SplQueue and SplStack as array elements:
To remove items from the front of the queue:
enqueue() is an alias for push(), but note that dequeue() is not an alias for pop(); pop() has a different meaning and function in the context of a queue. If we had used pop() here, it would remove the item from the end (tail) of the queue which violates the FIFO rule.
Similarly, to see what’s at the front (head) of the queue, we have to use bottom() instead of top():
Summary
In this article, you’ve seen how the stack and queue abstract data types are used in programming. These data structures are abstract, in that they are defined by the operations that can be performed on itself, thereby creating a wall between its implementation and the underlying data.
These structures are also constrained by the effect of such operations: You can only add or remove items from the top of the stack, and you can only remove items from the front of the queue, or add items to the rear of the queue.
Image by Alexandre Dulaunoy via Flickr
Dalam contoh program berikut ini saya gunakan double linked list untuk implementasi queue. Secara umum, operasi dalam queue ada 2 yang utama yaitu enqueue dan dequeue. Enqueue berarti memasukkan item baru ke dalam antrian. Sedangkan dequeue untuk mengeluarkan item dari antrian. Queue bersifat FIFO, First In First Out. Antrian (Queue) merupakan representasi data yang hanya memperbolehkan pengaksesan data pada dua ujung. Penyisipan data dilakukan dibelakan (ekor) dan pengeluaran data dilakukan diujung (kepala). Berbeda dengan double lingked list pada praktikum 5 yang diperbolehkan mengakses data di sembarang tempat. Contoh program single linked list non circular tambah list di depan. Buatlah sebuah program yang mengimplementasikan Doubly Linked List dengan menggunakan.
I have some problems that code. I read file in code and build one stack and one queues structure. But the code wasn't run correctly.
This is Node classI used Double LinkedList
** this is stack class. **
This is Queues Class
This is Queues Class
1 Answer
Ok, so you have a couple of problems. I'm going to point out a few and let you work to fix the rest because this looks like an assignment and I don't want to do your homework for you :).
First, when you read from the file be careful not to ignore the first element:
Notice that unlike your solution I first do the push y.Push(line) so that we don't forget to add whatever is already read into line. Same goes for the queue file:
Just add it if it's not null and then read the next line. You were always missing on the first element from the file.
Another problem is the Queues class (which by the way is misspelled you should replace O with Q). This one is not working properly because you forgot to increment and decrement the size when you insert or remove.
Notice that at the end of insert I'm increasing the size so that the list method doesn't throw a NullPointerException every time we call it. Same goes for the remove method:
Please also notice that your check before (if(head.nexttail)) was also throwing NullPointerException because at the beginning the head is always null so you cannot access the next member. Finally I've made a small improvement to the list method as well so that we return earlier:
Notice the return if the Queue is empty, otherwise we will attempt to do tail.getNext() which will always throw a NullPointerException.
Some important thoughts about the code in generalPlease avoid weird naming. Why Queues? There is just one so it should be Queue.Please avoid weird variable names. Your code is not just for you, chances are someone else might need to read and it gets hard to know who it is s, y, k, fwy and fwk. Why not naming them like this:
And the same goes for methods . Why Push, Pop and Top are the only methods that start with upper-case letter ? If you don't agree with the standard Java naming convention that is fine but at least be consistent :).
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Try the suggested improvements and see how your program it's working. I'm almost sure there are more problems with it. If you can't figure them out yourself leave a comment and I will help you. Good luck!
Not the answer you're looking for? Browse other questions tagged javadata-structures or ask your own question.
| /*Queue - Linked List implementation*/ |
| #include<stdio.h> |
| #include<stdlib.h> |
| struct Node { |
| int data; |
| struct Node* next; |
| }; |
| // Two glboal variables to store address of front and rear nodes. |
| struct Node* front = NULL; |
| struct Node* rear = NULL; |
| // To Enqueue an integer |
| voidEnqueue(int x) { |
| struct Node* temp = |
| (struct Node*)malloc(sizeof(struct Node)); |
| temp->data =x; |
| temp->next = NULL; |
| if(front NULL && rear NULL){ |
| front = rear = temp; |
| return; |
| } |
| rear->next = temp; |
| rear = temp; |
| } |
| // To Dequeue an integer. |
| voidDequeue() { |
| struct Node* temp = front; |
| if(front NULL) { |
| printf('Queue is Emptyn'); |
| return; |
| } |
| if(front rear) { |
| front = rear = NULL; |
| } |
| else { |
| front = front->next; |
| } |
| free(temp); |
| } |
| intFront() { |
| if(front NULL) { |
| printf('Queue is emptyn'); |
| return; |
| } |
| return front->data; |
| } |
| voidPrint() { |
| struct Node* temp = front; |
| while(temp != NULL) { |
| printf('%d',temp->data); |
| temp = temp->next; |
| } |
| printf('n'); |
| } |
| intmain(){ |
| /* Drive code to test the implementation. */ |
| // Printing elements in Queue after each Enqueue or Dequeue |
| Enqueue(2); Print(); |
| Enqueue(4); Print(); |
| Enqueue(6); Print(); |
| Dequeue(); Print(); |
| Enqueue(8); Print(); |
| } |
commented May 25, 2015
Thnx |
There is a mistake in dequeue method .you need to do temp = temp->next; |
commented Apr 4, 2016
Shouldn't you return something with the Dequeue function? |
Why have you used the Front function? It's never really called. Please explain the purpose of this function definition. |
commented Jul 23, 2016
@MRSharff - The purpose of dequeue function is to delete a node from the linked list. It has nothing to do with returning something. |
Thanks a lot for this sample code. |
commented Nov 15, 2016 • edited
edited
Hey, There is a typo in Front function, when frontNULL - > return -1 or something instead of nothing. |
Your code is very helpful here is another example hope it adds to your concept. |
commented Apr 28, 2017
There is a simpler one here |
commented Nov 27, 2017 •
commented Dec 20, 2017
what we must do if the Data in our struct was int and string (number and name of student) |
can anyone tell me what is the use of the function int Front in this code?I am confused. |
commented Jan 29, 2018
@labeelola This is when you want to view, the latest value in front of the queue. This is not called, but that's not a problem, you can call it anywhere. It is just to view. |
Hey guys, Please help me to complete my Assignment, I dont know much about C Programming
Remark: ADT Queue is 'First in First Out'. enqueue - always add a new node at the back of the queue. dequeue - delete the head of the queue. |
commented Aug 10, 2018
Contoh Program Queue Dengan Linked List Example
Thank you so much |
sir make videos on other topics also,i observed that u r not uploading videos from past 2-3 years ,why sir? |
commented Oct 13, 2018
THANKS ..IT'S SIMPLE AND COOL .. |
Its to get the first element of the Queue(He didn't call it though) |
commented Feb 11, 2019
If anyone tried with local front and rear variables in main method ! |
Contoh Program Queue Dengan Linked List Adalah
in the Dequeue function when the second if(frontrear) runs we have to free the space of node pointed by front previously i.e first node is the one when front and rear are equal if we modify the pointer front and rear to NULL we are wasting the memory of first node that was created |