Implementation of Linked List Data Structure in C Programming Language

This assignment presents a C program that implements a linked list data structure. The code includes functions for inserting nodes at the beginning, end, and between existing nodes. It also provides functionality to remove nodes from the beginning, end, or a specific location within the list. The program utilizes a menu-driven interface, allowing users to choose between insertion, deletion, display, and exit options. The core of the program involves the `Node` structure, which contains data and a pointer to the next node, forming the chain of elements. The insertion functions handle the allocation of new nodes and the adjustment of pointers to maintain the list's integrity. Deletion functions manage the deallocation of nodes and pointer adjustments to remove elements. The `display` function iterates through the list, printing the data of each node. The program effectively demonstrates the fundamental operations of a linked list data structure, providing a practical example for computer science students. This assignment is perfect for those seeking to understand and implement dynamic data structures using C programming language.

Implementation of linked list
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void insertAtBeginning(int);
void insertAtEnd(int);
void insertBetween(int,int,int);
void display();
void removeBeginning();
void removeEnd();
void removeSpecific(int);
struct Node
{
int data;
struct Node *next;
}*head = NULL;
void main()
{
int choice,value,choice1,loc1,loc2;
clrscr();
while(1){
mainMenu: printf("\n\n********* MENU ************\n1. Insert\n2. Display\
n3. Delete\n4. Exit\nEnter your choice: ");
scanf("%d",&choice);
switch(choice)
{
case 1: printf("Enter the value to be insert: ");
scanf("%d",&value);
while(1){
printf("Where you want to insert: \n1. At Beginning\n2. At
End\n3. Between\nEnter your choice: ");
scanf("%d",&choice1);
switch(choice1)
{
case 1: insertAtBeginning(value);
break;
case 2: insertAtEnd(value);
break;
case 3: printf("Enter the two values where you wanto
insert: ");
scanf("%d%d",&loc1,&loc2);
insertBetween(value,loc1,loc2);
break;
default: printf("\nWrong Input!! Try again!!!\n\n");
goto mainMenu;
}
goto subMenuEnd;
}
subMenuEnd:
break;
case 2: display();
break;

case 3: printf("How do you want to Delete: \n1. From Beginning\n2.
From End\n3. Spesific\nEnter your choice: ");
scanf("%d",&choice1);
switch(choice1)
{
case 1: removeBeginning();
break;
case 2: removeEnd(value);
break;
case 3: printf("Enter the value which you wanto
delete: ");
scanf("%d",&loc2);
removeSpecific(loc2);
break;
default: printf("\nWrong Input!! Try again!!!\n\n");
goto mainMenu;
}
break;
case 4: exit(0);
default: printf("\nWrong input!!! Try again!!\n\n");
}
}
}
void insertAtBeginning(int value)
{
struct Node *newNode;
newNode = (struct Node*)malloc(sizeof(struct Node));
newNode->data = value;
if(head == NULL)
{
newNode->next = NULL;
head = newNode;
}
else
{
newNode->next = head;
head = newNode;
}
printf("\nOne node inserted!!!\n");
}
void insertAtEnd(int value)
{
struct Node *newNode;
newNode = (struct Node*)malloc(sizeof(struct Node));
newNode->data = value;
newNode->next = NULL;
if(head == NULL)
head = newNode;
else
{
struct Node *temp = head;
while(temp->next != NULL)
temp = temp->next;
temp->next = newNode;
}
printf("\nOne node inserted!!!\n");

}
void insertBetween(int value, int loc1, int loc2)
{
struct Node *newNode;
newNode = (struct Node*)malloc(sizeof(struct Node));
newNode->data = value;
if(head == NULL)
{
newNode->next = NULL;
head = newNode;
}
else
{
struct Node *temp = head;
while(temp->data != loc1 && temp->data != loc2)
temp = temp->next;
newNode->next = temp->next;
temp->next = newNode;
}
printf("\nOne node inserted!!!\n");
}
void removeBeginning()
{
if(head == NULL)
printf("\n\nList is Empty!!!");
else
{
struct Node *temp = head;
if(head->next == NULL)
{
head = NULL;
free(temp);
}
else
{
head = temp->next;
free(temp);
printf("\nOne node deleted!!!\n\n");
}
}
}
void removeEnd()
{
if(head == NULL)
{
printf("\nList is Empty!!!\n");
}
else
{
struct Node *temp1 = head,*temp2;
if(head->next == NULL)
head = NULL;
else
{
while(temp1->next != NULL)
{

temp2 = temp1;
temp1 = temp1->next;
}
temp2->next = NULL;
}
free(temp1);
printf("\nOne node deleted!!!\n\n");
}
}
void removeSpecific(int delValue)
{
struct Node *temp1 = head, *temp2;
while(temp1->data != delValue)
{
if(temp1 -> next == NULL){
printf("\nGiven node not found in the list!!!");
goto functionEnd;
}
temp2 = temp1;
temp1 = temp1 -> next;
}
temp2 -> next = temp1 -> next;
free(temp1);
printf("\nOne node deleted!!!\n\n");
functionEnd:
}
void display()
{
if(head == NULL)
{
printf("\nList is Empty\n");
}
else
{
struct Node *temp = head;
printf("\n\nList elements are - \n");
while(temp->next != NULL)
{
printf("%d --->",temp->data);
temp = temp->next;
}
printf("%d --->NULL",temp->data);
}
}
Output