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#include <stdio.h> #include <stdlib.h> #include <conio.h> #include <malloc.h> struct node { int data; struct node * next; }; // decalre all functions struct node * start = NULL; struct node * create_ll(struct node * ); struct node * display(struct node * ); struct node * insert_beg(struct node * ); struct node * insert_end(struct node * ); struct node * delete_beg(struct node * ); struct node * delete_end(struct node * ); struct node * delete_list(struct node * ); void main() { int option; do { printf("\n\n *****MAIN MENU *****"); printf("\n 1: Create a list"); printf("\n 2: Display the list"); printf("\n 3: Add a node at the beginning"); printf("\n 4: Add a node at the end"); printf("\n 5: Delete a node from the beginning"); printf("\n 6: Delete a node from the end"); printf("\n 7: Delete the entire list"); printf("\n 8: EXIT"); printf("\n\n Enter your option : "); scanf("%d", &option); switch (option) { case 1: start = create_ll(start); printf("\n LINKED LIST CREATED"); break; case 2: start = display(start); break; case 3: start = insert_beg(start); break; case 4: start = insert_end(start); break; case 5: start = delete_beg(start); break; case 6: start = delete_end(start); break; case 7: start = delete_list(start); printf("\n LINKED LIST DELETED"); break; } } while (option != 8); getch(); } //Create linked list function //it will keep asking for data until -1 is entered struct node * create_ll(struct node * start) { struct node * new_node, * ptr; int num; printf("\n Enter -1 to end"); printf("\n Enter the data: "); scanf("%d", & num); while (num != -1) { new_node = (struct node * ) malloc(sizeof(struct node)); new_node -> data = num; if (start == NULL) { new_node -> next = NULL; start = new_node; } else { ptr = start; while (ptr -> next != NULL) ptr = ptr -> next; ptr -> next = new_node; new_node -> next = NULL; } printf("\n Enter the data : "); scanf("%d", & num); } return start; } //display linked list data //after looping it from start until NULL struct node * display(struct node * start) { struct node * ptr; ptr = start; while (ptr != NULL) { printf("\t %d", ptr -> data); ptr = ptr -> next; } return start; } //insert a node at beginning struct node * insert_beg(struct node * start) { struct node * new_node; int num; printf("\n Enter the data: "); scanf("%d", & num); new_node = (struct node *) malloc(sizeof(struct node)); new_node -> data = num; new_node -> next = start; start = new_node; return start; } //insert a node at the end of linked list struct node * insert_end(struct node * start) { struct node * ptr, * new_node; int num; printf("\n Enter the data: "); scanf("%d", &num); new_node = (struct node * ) malloc(sizeof(struct node)); new_node -> data = num; new_node -> next = NULL; ptr = start; while (ptr -> next != NULL) ptr = ptr -> next; ptr -> next = new_node; return start; } //delete the first node of Linked list struct node * delete_beg(struct node * start) { struct node * ptr; ptr = start; start = start -> next; free(ptr); return start; } //delete the last node of linked list struct node * delete_end(struct node * start) { struct node * ptr, * preptr; ptr = start; while (ptr -> next != NULL) { preptr = ptr; ptr = ptr -> next; } preptr -> next = NULL; free(ptr); return start; } //delete list completly struct node * delete_list(struct node * start) { struct node * ptr; if (start != NULL) { ptr = start; while (ptr != NULL) { printf("\n %d is to be deleted next", ptr -> data); start = delete_beg(ptr); ptr = start; } } return start; }

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