C Program For Queue Operations Using Arrays

Implement Queue using Stacks Geeksfor. Geeks. The problem is opposite of this post. We are given a stack data structure with push and pop operations, the task is to implement a queue using instances of stack data structure and operations on them. A queue can be implemented using two stacks. Let queue to be implemented be q and stacks used to implement q be stack. C Program For Queue Operations Using Arrays' title='C Program For Queue Operations Using Arrays' />Method 1 By making en. Queue operation costly This method makes sure that oldest entered element is always at the top of stack 1, so that de. Queue operation just pops from stack. To put the element at top of stack. C Program For Queue Operations Using Arrays' title='C Program For Queue Operations Using Arrays' />Queueq, x. While stack. Push x to stack. Push everything back to stack. If stack. 1 is empty then error. Pop an item from stack. Method 2 By making de. Queue operation costlyIn this method, in en queue operation, the new element is entered at the top of stack. VuBmaZu4ZVQ/T0PmGdii1UI/AAAAAAAAATc/5UeiCjyLjto/s1600/c+program+to+implement+queue+using+array+1.png' alt='C Program For Queue Operations Using Arrays' title='C Program For Queue Operations Using Arrays' />In de queue operation, if stack. Queueq, x. 1 Push x to stack. If both stacks are empty then error. If stack. 2 is empty. While stack. 1 is not empty, push everything from stack. Pop the element from stack. Method 2 is definitely better than method 1. Method 1 moves all the elements twice in en. Queue operation, while method 2 in de. Queue operation moves the elements once and moves elements only if stack. Implementation of method 2 C. Program to implement a queue using two stacks. Below C program implements various Circular Queue operations include define max 3 int q,front0,rear1 void main int ch void. Stack is a specialized data storage structure Abstract data type. Unlike, arrays access of elements in a stack is restricted. It has two main functions push and pop. Covers learnings from building a hybrid app platform with Chakra and C. Node ext. Function to push an item to stack. Node topref, int newdata. Function to pop an item from stack. Node topref. structure of queue having two stacks. Node tack. 1. struct s. Node tack. 2. Function to enqueue an item to queue. Queuestruct queue, int x. Function to dequeue an item from queue. Queuestruct queue. If both stacks are empty then error. NULL q stack. NULL. Q is empty. Move elements from satck. NULL. whileq stack. NULL. x pop q stack. Function to push an item to stack. Node topref, int newdata. Nodenewnode. Node mallocsizeofstruct s. Node. ifnewnode NULL. Stack overflow n. Function to pop an item from stack. Node topref. struct s. Node op. f stack is empty then error. NULL. printfStack overflow n. Driver function to test anove functions. Create a queue with items 1 2 3. NULL. q stack. NULL. Queueq, 1. Queueq, 2. Queueq, 3. Dequeue items. Queueq. printfd, de. Queueq. printfd, de. Queueq. Java Program to implement a queue using two stacks. Note that Stack class is used for Stack implementation. Stack. public class GFG. Queue. Stacklt Integer stack. Stacklt Integer stack. Function to push an item to stack. Stacklt Integer topref, int newdata. Push the data onto the stack. Function to pop an item from stack. Stacklt Integer topref. If stack is empty then error. Empty. System. Stack Overflow. Pdf Scanning Software For Windows on this page. System. exit0. pop the data from the stack. Function to enqueue an item to the queue. QueueQueue q, int x. Function to dequeue an item from queue. QueueQueue q. If both stacks are empty then error. Empty q. Empty. System. Q is empty. System. Move elements from stack. Empty. while Empty. Driver function to test anove functions. String args. Create a queue with items 1 2 3. Queue q new Queue. Stacklt. Stacklt. Queueq, 1. en. Queueq, 2. Queueq, 3. Dequeue items. System. out. printde. Queueq. System. Queueq. System. Queueq. This code is contributed by Sumit Ghosh. Output 1 2 3 Queue can also be implemented using one user stack and one Function Call Stack. Below is modified Method 2 where recursion or Function Call Stack is used to implement queue using only one user defined stack. Queuex. 1 Push x to stack. If stack. 1 is empty then error. If stack. 1 has only one element then return it. Recursively pop everything from the stack. The step 3 makes sure that the last popped item is always returned and since the recursion stops when there is only one item in stack. Implementation of method 2 using Function Call Stack C. Program to implement a queue using one user defined stack. Function Call Stack. Node ext. structure of queue having two stacks. Node tack. 1. Function to push an item to stack. Node topref, int newdata. Function to pop an item from stack. Node topref. Function to enqueue an item to queue. Queuestruct queue, int x. Function to dequeue an item from queue. Queuestruct queue. If both stacks are empty then error. NULL. printfQ is empty. NULL. return pop q stack. Queueq. push everything back to stack. Function to push an item to stack. Node topref, int newdata. Nodenewnode. Node mallocsizeofstruct s. Node. ifnewnode NULL. Stack overflow n. Function to pop an item from stack. Node topref. struct s. Node op. f stack is empty then error. NULL. printfStack overflow n. Driver function to test above functions. Create a queue with items 1 2 3. NULL. en. Queueq, 1. Queueq, 2. en. Queueq, 3. Dequeue items. Queueq. Queueq. printfd, de. Queueq. Java Program to implement a queue using one stack. Stack. public class QOne. Stack. class of queue having two stacks. Queue. Stacklt Integer stack. Function to push an item to stack. Stacklt Integer topref,int newdata. Function to pop an item from stack. Stacklt Integer topref. If stack is empty then error. System. out. printlnStack Overflow. System. exit0. return element from stack. Function to enqueue an item to queue. QueueQueue q,int x. Function to dequeue an item from queue. QueueQueue q. If the stacks is empty then error. Empty. System. Q is Empty. System. Check if it is a last element of stack. Queueq. push everything back to stack. Driver function to test above functions. String args. Create a queue with items 1 2 3. Queue q new Queue. Stacklt. Queueq, 1. Queueq, 2. Queueq, 3. Dequeue items. System. Queueq. System. Queueq. System. Queueq. This code is contributed by Sumit Ghosh. Output 1 2 3 Please write comments if you find any of the above codesalgorithms incorrect, or find better ways to solve the same problem. C Program to Implement Queue Data Structure using Linked List. This C Program implements queue using linked list. Queue is a particular kind of abstract data type or collection in which the entities in the collection are kept in order and the principal or only operations on the collection are the addition of entities to the rear terminal position, known as enqueue, and removal of entities from the front terminal position, known as dequeue. This makes the queue a First In First Out FIFO data structure. Linked list is a data structure consisting of a group of nodes which together represent a sequence. Here we need to apply the application of linkedlist to perform basic operations of queue. Here is source code of the C Program to implement queue using linked list. The C program is successfully compiled and run on a Linux system. The program output is also shown below. C Program to Implement Queue Data Structure using Linked List. Enque printfn 2 Deque printfn 3 Front element printfn 4 Empty printfn 5 Exit printfn 6 Display printfn 7 Queue size. Enter choice scanfd, ch switchchcase. Enter data scanfd, no. Front element d, e elseprintfn No front element in Queue as queue is empty break case. Wrong choice, Please enter correct choice break. Create an empty queue void create. NULL. Returns queue size void queuesizeprintfn Queue size d, count. Enqueing the queue void enqint dataifrear NULL. NULL. rear info data. NULL. rear temp. Displaying the queue elements void display. NULL rear NULLprintfQueue is empty return whilefront. Dequeing the queue void deq. NULLprintfn Error Trying to display elements from empty queue return elseiffront. Computer Knowledge By Kiran Publication Pdf more. NULL. front. 1 front. Dequed value d, front info freefront. Dequed value d, front info freefront. NULL. rear NULL. Returns the front element of queue int frontelementiffront NULL rear NULLreturnfront info elsereturn. Display if queue is empty or not void emptyiffront NULL rear NULLprintfn Queue empty elseprintfQueue not empty cc pgm. Front element. Enter choice 1. Enter data 1. 4. Enter choice 1. Enter data 8. 5. Enter choice 1. Enter data 3. 8. Enter choice 3. Front element 1. Enter choice 6. Enter choice 7. Enter choice 2. Dequed value 1. Enter choice 6. Enter choice 7. Enter choice 4. Queue not empty. Enter choice 5. Sanfoundry Global Education Learning Series 1. C Programs. Heres the list of Best Reference Books in C Programming, Data Structures and Algorithms. If you wish to look at other example programs on Linked List, go to Linked List. If you wish to look at programming examples on all topics, go to C Programming Examples.