Program to insert the node at the end of the singly linked list.c

Program to insert the node at the end of the singly linked list.c

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+// A complete working C program to demonstrate all insertion methods
+// on 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)
+{
+	/* 1. allocate node */
+	struct Node* new_node = (struct Node*) malloc(sizeof(struct Node));
+
+	/* 2. put in the data */
+	new_node->data = new_data;
+
+	/* 3. Make next of new node as head */
+	new_node->next = (*head_ref);
+
+	/* 4. move the head to point to the new node */
+	(*head_ref) = new_node;
+}
+
+/* Given a node prev_node, insert a new node after the given
+prev_node */
+void insertAfter(struct Node* prev_node, int new_data)
+{
+	/*1. check if the given prev_node is NULL */
+	if (prev_node == NULL)
+	{
+	printf("the given previous node cannot be NULL");
+	return;
+	}
+
+	/* 2. allocate new node */
+	struct Node* new_node =(struct Node*) malloc(sizeof(struct Node));
+
+	/* 3. put in the data */
+	new_node->data = new_data;
+
+	/* 4. Make next of new node as next of prev_node */
+	new_node->next = prev_node->next;
+
+	/* 5. move the next of prev_node as new_node */
+	prev_node->next = new_node;
+}
+
+/* Given a reference (pointer to pointer) to the head
+of a list and an int, appends a new node at the end */
+void append(struct Node** head_ref, int new_data)
+{
+	/* 1. allocate node */
+	struct Node* new_node = (struct Node*) malloc(sizeof(struct Node));
+
+	struct Node *last = *head_ref; /* used in step 5*/
+
+	/* 2. put in the data */
+	new_node->data = new_data;
+
+	/* 3. This new node is going to be the last node, so make next of
+		it as NULL*/
+	new_node->next = NULL;
+
+	/* 4. If the Linked List is empty, then make the new node as head */
+	if (*head_ref == NULL)
+	{
+	*head_ref = new_node;
+	return;
+	}
+
+	/* 5. Else traverse till the last node */
+	while (last->next != NULL)
+		last = last->next;
+
+	/* 6. Change the next of last node */
+	last->next = new_node;
+	return;
+}
+
+// This function prints contents of linked list starting from head
+void printList(struct Node *node)
+{
+while (node != NULL)
+{
+	printf(" %d ", node->data);
+	node = node->next;
+}
+}
+
+/* Driver program to test above functions*/
+int main()
+{
+/* Start with the empty list */
+struct Node* head = NULL;
+
+// Insert 6. So linked list becomes 6->NULL
+append(&head, 6);
+
+// Insert 7 at the beginning. So linked list becomes 7->6->NULL
+push(&head, 7);
+
+// Insert 1 at the beginning. So linked list becomes 1->7->6->NULL
+push(&head, 1);
+
+// Insert 4 at the end. So linked list becomes 1->7->6->4->NULL
+append(&head, 4);
+
+// Insert 8, after 7. So linked list becomes 1->7->8->6->4->NULL
+insertAfter(head->next, 8);
+
+printf("\n Created Linked list is: ");
+printList(head);
+
+return 0;
+}

README.md

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