Insert node at the middle of Singly Linked List
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#include <stdio.h> #include <stdlib.h> struct node { int data; struct node *next; }*head; void Starting_Link_List(int n); void insertNodeAtMiddle(int data, int position); void ShowSingly_List(); int main() { int n, data, position; printf("Please Enter the total number of nodes: "); scanf("%d", &n); Starting_Link_List(n); printf("\nData in the singly link list \n"); ShowSingly_List(); /* * Insert data at middle of the singly linked list */ printf("n Please Enter data to insert at middle of the list: "); scanf("%d", &data); printf("Enter the position to insert new node: " ); scanf("%d", &position); insertNodeAtMiddle(data, position); printf("\n Data in the SINGLY LINK list \n"); ShowSingly_List(); return 0; } void Starting_Link_List(int n) { struct node *newNode, *temp; int data, i; head = (struct node *)malloc(sizeof(struct node)); /* * If unable to allocate memory for head node */
if(head == NULL) { printf("Sorry! Unable to allocate memory."); } else { /* * Input data of node from the user */ printf("Please Enter the data for node 1: "); scanf("%d", &data); head->data = data; // Link the data field with data head->next = NULL; // Link the address field to NULL temp = head; /* * Creates n nodes and adds to linked list */ for(i=2; i<=n; i++) { newNode = (struct node *)malloc(sizeof(struct node)); /* If memory is not allocated for newNode */ if(newNode == NULL) { printf("Sorry! Unable to allocate memory."); break; } else { printf("Please Enter the data of node %d: ", i
); scanf("%d", &data); newNode->data = data; // Linking the data of newNode with data newNode->next = NULL; // Linking the address of newNode with NULL temp->next = newNode; // Linking previous node temp = temp->next; } } printf("Congratulations! Your SINGLY LINKED LIST is CREATED.\n"); } } void insertNodeAtMiddle(int data, int position) { int i; struct node *newNode, *temp; newNode = (struct node*)malloc(sizeof(struct node)); if(newNode == NULL) { printf("Unable to allocate memory."); } else { newNode->data = data; // Link data part newNode->next = NULL; temp = head; /* * Traverse to the n-1 position */ for(i=2; i<=position-1; i++) { temp = temp->next; if(temp == NULL) break; } if(temp != NULL) { /* Link address part of new node */ newNode->next = temp->next; /* Link address part of n-1 node */ temp->next = newNode; printf("DATA INSERTED SUCCESSFULLY\n"); } else { printf("UNABLE TO INSERT DATA AT THE GIVEN POSITION\n"); } } } /* * Display entire list */ void ShowSingly_List() { struct node *temp; /* * If the list is empty i.e. head = NULL */ if(head == NULL) { printf("List is empty."); } else { temp = head; while(temp != NULL) { printf("Data = %d\n", temp->data); // Print data of current node temp = temp->next; // Move to next node } } } |