Building a Linked List
Let's write a simple function to create a node. This function should:
- As an argument, take a number of type int, which will be stored in the node in the data field;
- Create a pointer to a dynamically allocated memory area (taking into account the size of the node);
- Check the success of memory allocation for the node;
- Put the required value (function argument) into the data field;
- The next pointer must be NULL, since the function creates only one node;
- The function must return a pointer to the memory area where value is stored.
The AddNewNode() function takes a pointer to a pointer, because it can change the value of the pointer to the first (head) node of the list, as well as the value that will be stored in the new node:
void AddNewNode(struct Node** head, int value)
{
...
}
If the list is empty (*head == NULL), we simply update the pointer to the head of the list (*head) to point to the new node (newNode), in which case newNode will become the first node (head node). In the case of a non-empty list, we use a loop to look for the last node.
The current node plays the role of a buffer node, with its help we can iterate through the list and find a node that points to nowhere (*next == NULL).
Note
The last node in the list will have a next pointer equal to NULL.
struct Node* current = *head;
while (current->next != NULL)
{
…
}
After all, you need to make the new node newNode
the last node, which means current->next
must be equal to newNode
. Now newNode is the last node in the list.
As a task, you need to figure out and add a function for adding new nodes to existing nodes.
Swipe to start coding
-
Create a new node
newNode
, which will store the data value; -
Specify the condition under which the list will be considered empty;
-
Specify what
current->next
will be equal to after the loop completes.
Solución
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Building a Linked List
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Let's write a simple function to create a node. This function should:
- As an argument, take a number of type int, which will be stored in the node in the data field;
- Create a pointer to a dynamically allocated memory area (taking into account the size of the node);
- Check the success of memory allocation for the node;
- Put the required value (function argument) into the data field;
- The next pointer must be NULL, since the function creates only one node;
- The function must return a pointer to the memory area where value is stored.
The AddNewNode() function takes a pointer to a pointer, because it can change the value of the pointer to the first (head) node of the list, as well as the value that will be stored in the new node:
void AddNewNode(struct Node** head, int value)
{
...
}
If the list is empty (*head == NULL), we simply update the pointer to the head of the list (*head) to point to the new node (newNode), in which case newNode will become the first node (head node). In the case of a non-empty list, we use a loop to look for the last node.
The current node plays the role of a buffer node, with its help we can iterate through the list and find a node that points to nowhere (*next == NULL).
Note
The last node in the list will have a next pointer equal to NULL.
struct Node* current = *head;
while (current->next != NULL)
{
…
}
After all, you need to make the new node newNode
the last node, which means current->next
must be equal to newNode
. Now newNode is the last node in the list.
As a task, you need to figure out and add a function for adding new nodes to existing nodes.
Swipe to start coding
-
Create a new node
newNode
, which will store the data value; -
Specify the condition under which the list will be considered empty;
-
Specify what
current->next
will be equal to after the loop completes.
Solución
¡Gracias por tus comentarios!
Awesome!
Completion rate improved to 4.17single