# C Programming Exercises, Practice, Solution : Linked List

## C Singly Linked List [12 exercises with solution]

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1. Write a program in C to create and display Singly Linked List. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 5
Input data for node 2 : 6
Input data for node 3 : 7
Expected Output :

``` Data entered in the list :
Data = 5
Data = 6
Data = 7
```

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2. Write a program in C to create a singly linked list of n nodes and display it in reverse order. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 5
Input data for node 2 : 6
Input data for node 3 : 7
Expected Output :

``` Data entered in the list are :
Data = 5
Data = 6
Data = 7

The list in reverse are :
Data = 7
Data = 6
Data = 5
```

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3. Write a program in C to create a singly linked list of n nodes and count the number of nodes. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 5
Input data for node 2 : 6
Input data for node 3 : 7
Expected Output :

``` Data entered in the list are :
Data = 5
Data = 6
Data = 7

Total number of nodes = 3
```

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4. Write a program in C to insert a new node at the beginning of a Singly Linked List. Go to the editor
Test Data and Expected Output :

``` Input the number of nodes : 3
Input data for node 1 : 5
Input data for node 2 : 6
Input data for node 3 : 7

Data entered in the list are :
Data = 5
Data = 6
Data = 7

Input data to insert at the beginning of the list : 4

Data after inserted in the list are :
Data = 4
Data = 5
Data = 6
Data = 7
```

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5. Write a program in C to insert a new node at the end of a Singly Linked List. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 5
Input data for node 2 : 6
Input data for node 3 : 7

Data entered in the list are :
Data = 5
Data = 6
Data = 7

Input data to insert at the end of the list : 8

Data, after inserted in the list are :
Data = 5
Data = 6
Data = 7
Data = 8
```

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6. Write a program in C to insert a new node at the middle of Singly Linked List. Go to the editor
Test Data and Expected Output :

```Input the number of nodes (3 or more) : 4
Input data for node 1 : 1
Input data for node 2 : 2
Input data for node 3 : 3
Input data for node 4 : 4

Data entered in the list are :
Data = 1
Data = 2
Data = 3
Data = 4

Input data to insert in the middle of the list : 5
Input the position to insert new node : 3

Insertion completed successfully.

The new list are :
Data = 1
Data = 2
Data = 5
Data = 3
Data = 4
```

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7. Write a program in C to delete first node of Singly Linked List. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 3
Input data for node 3 : 4
Expected Output :

``` Data entered in the list are :
Data = 2
Data = 3
Data = 4

Data of node 1 which is being deleted is :  2

Data, after deletion of first node :
Data = 3
Data = 4
```

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8. Write a program in C to delete a node from the middle of Singly Linked List. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
Data = 2
Data = 5
Data = 8

Input the position of node to delete : 2

Deletion completed successfully.

The new list are  :
Data = 2
Data = 8
```

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9. Write a program in C to delete the last node of Singly Linked List. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 1
Input data for node 2 : 2
Input data for node 3 : 3
Expected Output :

``` Data entered in the list are :
Data = 1
Data = 2
Data = 3

The new list after deletion the last node are  :
Data = 1
Data = 2
```

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10. Write a program in C to search an existing element in a singly linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3

Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
Data = 2
Data = 5
Data = 8

Input the element to be searched : 5
Element found at node 2
```

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11. Write a C program to convert a Singly Linked list into a string and returns it. Go to the editor
Test Data and Expected Output :

```Linked List: Convert a Singly Linked list into a string
-------------------------------------------------------------
Input the number of nodes: 3
Input data for node 1 : 10
Input data for node 2 : 20
Input data for node 3 : 30

Return data entered in the list as a string:
The linked list: 10 20 30
```

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12. Write a C program to convert a Singly Linked list into a array and returns it. Go to the editor
Test Data and Expected Output :

```Linked List: Convert a Singly Linked list into a string
-------------------------------------------------------------
Input the number of nodes: 3
Input data for node 1 : 10
Input data for node 2 : 20
Input data for node 3 : 30

Return data entered in the list as a string:
The linked list: 10 20 30
```

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## C Doubly Linked List [22 exercises with solution]

13. Write a program in C to create and display a doubly linked list. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8
Expected Output :

``` Data entered on the list are :
node 1 : 2
node 2 : 5
node 3 : 8
```

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14. Write a program in C to create a doubly linked list and display in reverse order. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8
Expected Output :

``` Data in reverse order are :
Data in node 1 : 8
Data in node 2 : 5
Data in node 3 : 2
```

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15. Write a program in C to insert a new node at the beginning in a doubly linked list. Go to the editor
Test Data and Expected Output :

``` Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
node 1 : 2
node 2 : 5
node 3 : 8
Input data for the first node : 1

After insertion the new list are :
node 1 : 1
node 2 : 2
node 3 : 5
node 4 : 8
```

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16. Write a program in C to insert a new node at the end of a doubly linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
node 1 : 2
node 2 : 5
node 3 : 8
Input data for the last node : 9

After insertion the new list are :
node 1 : 2
node 2 : 5
node 3 : 8
node 4 : 9
```

Click me to see the solution

17. Write a program in C to insert a new node at any position in a doubly linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes (3 or more ): 3
Input data for node 1 : 2
Input data for node 2 : 4
Input data for node 3 : 5

Data entered in the list are :
node 1 : 2
node 2 : 4
node 3 : 5
Input the position ( 2 to 2 ) to insert a new node : 2
Input data for the position 2 : 3

After insertion the new list are :
node 1 : 2
node 2 : 3
node 3 : 4
node 4 : 5
```

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18. Write a program in C to insert a new node at the middle in a doubly linked list. Go to the editor
Test Data and Expected Output :

```  Doubly Linked List : Insert new node at the middle in a doubly linked list :
----------------------------------------------------------------------------------
Input the number of nodes (3 or more ): 3
Input data for node 1 : 2
Input data for node 2 : 4
Input data for node 3 : 5

Data entered in the list are :
node 1 : 2
node 2 : 4
node 3 : 5
Input the position ( 2 to 2 ) to insert a new node : 2
Input data for the position 2 : 3

After insertion the new list are :
node 1 : 2
node 2 : 3
node 3 : 4
node 4 : 5
```

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19. Write a program in C to delete a node from the beginning of a doubly linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes (3 or more ): 3
Input data for node 1 : 1
Input data for node 2 : 2
Input data for node 3 : 3

Data entered in the list are :
node 1 : 1
node 2 : 2
node 3 : 3

After deletion the new list are :
node 1 : 2
node 2 : 3
```

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20. Write a program in C to delete a node from the last of a doubly linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes (3 or more ): 3
Input data for node 1 : 1
Input data for node 2 : 2
Input data for node 3 : 3

Data entered in the list are :
node 1 : 1
node 2 : 2
node 3 : 3

After deletion the new list are :
node 1 : 1
node 2 : 2
```

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21. Write a program in C to delete a node from any position of a doubly linked list. Go to the editor
Test Data and Expected Output :

``` Doubly Linked List : Delete node from any position of a doubly linked list :
----------------------------------------------------------------------------------
Input the number of nodes (3 or more ): 3
Input data for node 1 : 1
Input data for node 2 : 2
Input data for node 3 : 3

Data entered in the list are :
node 1 : 1
node 2 : 2
node 3 : 3
Input the position ( 1 to 3 ) to delete a node : 3

After deletion the new list are :
node 1 : 1
node 2 : 2
```

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22. Write a program in C to delete a node from the middle of a doubly linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes (3 or more ): 3
Input data for node 1 : 1
Input data for node 2 : 2
Input data for node 3 : 3

Data entered in the list are :
node 1 : 1
node 2 : 2
node 3 : 3
Input the position ( 1 to 3 ) to delete a node : 2

After deletion the new list are :
node 1 : 1
node 2 : 3
```

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23. Write a program in C to find the maximum value from a doubly linked list. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 5
Input data for node 2 : 9
Input data for node 3 : 1
Expected Output :

``` Data entered in the list are :
node 1 : 5
node 2 : 9
node 3 : 1

The Maximum Value in the Linked List : 9
```

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24. Write a program in C to create and display a circular linked list. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8
Expected Output :

``` Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8
```

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25. Write a program in C to insert a node at the beginning of a circular linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8
Input data to be inserted at the beginning : 1

After insertion the new list are :
Data 1 = 1
Data 2 = 2
Data 3 = 5
Data 4 = 8
```

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26. Write a program in C to insert a node at the end of a circular linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8
Input the data to be inserted : 9

After insertion the new list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8
Data 4 = 9
```

Click me to see the solution

27. Write a program in C to insert a node at any position in a circular linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8
Input the position to insert a new node : 3
Input data for the position 3 : 7

After insertion the new list are :
Data 1 = 2
Data 2 = 5
Data 3 = 7
Data 4 = 8
```

Click me to see the solution

28. Write a program in C to delete node from the beginning of a circular linked list. Go to the editor
Test Data :
Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8
Expected Output :

``` Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8

The deleted node is -> 2
After deletion the new list are :
Data 1 = 5
Data 2 = 8
```

Click me to see the solution

29. Write a program in C to delete a node from the middle of a circular linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8

Input the position to delete the node : 3

The deleted node is : 8
After deletion the new list are :
Data 1 = 2
Data 2 = 5
```

Click me to see the solution

30. Write a program in C to delete the node at the end of a circular linked list. Go to the editor
Test Data and Expected Output :

```Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 8

Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 8

The deleted node is : 8
After deletion the new list are :
Data 1 = 2
Data 2 = 5
```

Click me to see the solution

31. Write a program in C to search an element in a circular linked list. Go to the editor
Test Data and Expected Output :

``` Circular Linked List : Search an element in a circular linked list :
-------------------------------------------------------------------------
Input the number of nodes : 3
Input data for node 1 : 2
Input data for node 2 : 5
Input data for node 3 : 9

Data entered in the list are :
Data 1 = 2
Data 2 = 5
Data 3 = 9
Input the element you want to find : 5
Element found at node 2
```

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32. Write a C programming to sort a given linked list by bubble sort. Go to the editor
Test Data and Expected Output : 5
15
33
49
6
65

``` Input number of elements in the linked list? Input the elements in the linked list:
Sorted order is:
6	15	33	49	65
```

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33. Write a C program to convert a Doubly Linked list into a string and returns it. Go to the editor
Test Data and Expected Output :

``` Input the number of nodes: 4
Input data for node 1 : 10
Input data for node 2 : 11
Input data for node 3 : 12
Input data for node 4 : 13

The doubly linked list in string format: 10 11 12 13

```

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34. Write a C program to convert a Doubly Linked list into a array and returns it. Go to the editor
Test Data and Expected Output :

``` Input the number of nodes: 4
Input data for node 1 : 10
Input data for node 2 : 11
Input data for node 3 : 12
Input data for node 4 : 13

Doubly linked list in array format:
10 11 12 13
```

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C Programming Code Editor:

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