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:
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.
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;
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Specify what
current->nextwill be equal to after the loop completes.
Рішення
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