ChatGPT explaining the following code
Explain this code in detail #include<stdlib.h>
#include<stdio.h>
struct Node{
int data;
struct Node *next;
};
void deleteStart(struct Node** head){
struct Node* temp = *head;
// If head is NULL it means Singly Linked List is empty
if(*head == NULL){
printf("Impossible to delete from empty Singly Linked List");
return;
}
// move head to next node
*head = (*head)->next;
printf("Deleted: %d\n", temp->data);
free(temp);
}
void insertStart(struct Node** head, int data){
// dynamically create memory for this newNode
struct Node* newNode = (struct Node*) malloc(sizeof(struct Node));
// assign data value
newNode->data = data;
// change the next node of this newNode
// to current head of Linked List
newNode->next = *head;
//re-assign head to this newNode
*head = newNode;
printf("Inserted %d\n",newNode->data);
}
void display(struct Node* node){
printf("\nLinked List: ");
// as linked list will end when Node is Null
while(node!=NULL){
printf("%d ",node->data);
node = node->next;
}
printf("\n");
}
int main()
{
struct Node* head = NULL;
// Need '&' i.e. address as we need to change head
insertStart(&head,100);
insertStart(&head,80);
insertStart(&head,60);
insertStart(&head,40);
insertStart(&head,20);
// No Need for '&' as not changing head in display operation
display(head);
deleteStart(&head);
deleteStart(&head);
display(head);
return 0;
}
The code you provided is an example of how to implement a singly-linked list in C. A linked list is a data structure that consists of a series of nodes, where each node contains some data and a reference (or pointer) to the next node in the list. In this case, the linked list is a singly-linked list, meaning that each node only has a reference to the next node in the list and not to any previous nodes.
The code begins by defining a struct called Node, which represents a single node in the linked list. The Node struct contains two fields: an int called data that stores the data for that node, and a struct Node * called next that points to the next node in the list.
Next, the code defines a function called deleteStart, which takes in a pointer to a pointer to a Node and deletes the first node in the linked list. The function first checks to see if the linked list is empty by checking if the head pointer is NULL. If the linked list is empty, the function prints a message and returns. If the linked list is not empty, the function moves the head pointer to the next node in the list and frees the memory for the deleted node.
The code also defines a function called insertStart, which takes in a pointer to a pointer to a Node and an int and inserts a new node with the given data at the beginning of the linked list. The function first dynamically allocates memory for the new node using malloc and assigns the given data to the data field of the new node. It then sets the next field of the new node to point to the current head of the list and assigns the new node as the head of the list.
The code also defines a function called display, which takes in a pointer to a Node and displays the data in each node of the linked list, starting from the given node. The function continues to traverse the linked list and print the data in each node until it reaches a NULL node, indicating the end of the list.
In the main function, the code first creates an empty linked list by initializing a Node pointer called head to NULL. It then uses the insertStart function to insert 5 nodes into the linked list, each with a different integer value. It then displays the linked list using the display function.
Next, the code uses the deleteStart function to delete the first two nodes in the linked list. It then displays the linked list again to show that the first two nodes have been deleted.
Overall, this code provides a basic example of how to implement a singly-linked list in C, including functions for inserting nodes at the beginning of the list and deleting the first node in the list, as well as a function for displaying the data in the list.
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