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- // A complete working C program to demonstrate deletion in singly
- // linked list
- #include <stdio.h>
- #include <stdlib.h>
- // A linked list node
- struct Node
- {
- int data;
- struct Node *next;
- };
- /* Given a reference (pointer to pointer) to the head of a list
- and an int, inserts a new node on the front of the list. */
- void push(struct Node** head_ref, int new_data)
- {
- struct Node* new_node = (struct Node*) malloc(sizeof(struct Node));
- new_node->data = new_data;
- new_node->next = (*head_ref);
- (*head_ref) = new_node;
- }
- /* Given a reference (pointer to pointer) to the head of a list
- and a key, deletes the first occurrence of key in linked list */
- void deleteNode(struct Node **head_ref, int key)
- {
- // Store head node
- struct Node* temp = *head_ref, *prev;
- // If head node itself holds the key to be deleted
- if (temp != NULL && temp->data == key)
- {
- *head_ref = temp->next; // Changed head
- free(temp); // free old head
- return;
- }
- // Search for the key to be deleted, keep track of the
- // previous node as we need to change 'prev->next'
- while (temp != NULL && temp->data != key)
- {
- prev = temp;
- temp = temp->next;
- }
- // If key was not present in linked list
- if (temp == NULL) return;
- // Unlink the node from linked list
- prev->next = temp->next;
- free(temp); // Free memory
- }
- // This function prints contents of linked list starting from
- // the given node
- void printList(struct Node *node)
- {
- while (node != NULL)
- {
- printf(" %d ", node->data);
- node = node->next;
- }
- }
- /* Drier program to test above functions*/
- int main()
- {
- /* Start with the empty list */
- struct Node* head = NULL;
- push(&head, 7);
- push(&head, 1);
- push(&head, 3);
- push(&head, 2);
- puts("Created Linked List: ");
- printList(head);
- deleteNode(&head, 1);
- puts("\nLinked List after Deletion of 1: ");
- printList(head);
- return 0;
- }
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