Untitled

#include <stdio.h>
#include <stdlib.h>

// Node structure definition
struct Node {
        int data;
            struct Node* next;
};

// Function to create a new node
struct Node* createNode(int data) {
        struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
            if (!newNode) {
                        printf("Memory allocation failed!\n");
                                exit(1);
            }
                newNode->data = data;
                    newNode->next = NULL;
                        return newNode;
}

// Function to insert a node at the end
void insertAtEnd(struct Node** head, int data) {
        struct Node* newNode = createNode(data);
            if (*head == NULL) {
                        *head = newNode;
                                return;
            }
                
                    struct Node* temp = *head;
                        while (temp->next != NULL)
                                temp = temp->next;
                                    
                                        temp->next = newNode;
}

// Function to insert a node at the beginning
void insertAtBeginning(struct Node** head, int data) {
        struct Node* newNode = createNode(data);
            newNode->next = *head;
                *head = newNode;
}

// Function to delete a node with a given key
void deleteNode(struct Node** head, int key) {
        struct Node* temp = *head, *prev = NULL;

            // If head node itself holds the key
                if (temp != NULL && temp->data == key) {
                            *head = temp->next;
                                    free(temp);
                                            return;
                }

                    // Search for the key
                        while (temp != NULL && temp->data != key) {
                                    prev = temp;
                                            temp = temp->next;
                        }

                            // Key not found
                                if (temp == NULL) {
                                            printf("Node with value %d not found!\n", key);
                                                    return;
                                }

                                    // Unlink the node and free memory
                                        prev->next = temp->next;
                                            free(temp);
}

// Function to search for a node
int search(struct Node* head, int key) {
        struct Node* temp = head;
            while (temp != NULL) {
                        if (temp->data == key)
                                    return 1; // Found
                                            temp = temp->next;
            }
                return 0; // Not found
}

// Function to display the linked list
void display(struct Node* head) {
        struct Node* temp = head;
            if (head == NULL) {
                        printf("List is empty!\n");
                                return;
            }
                while (temp != NULL) {
                            printf("%d -> ", temp->data);
                                    temp = temp->next;
                }
                    printf("NULL\n");
}

// Main function to demonstrate linked list operations
int main() {
        struct Node* head = NULL;

            int choice, value, key;
                while (1) {
                            printf("\nMenu:\n");
                                    printf("1. Insert at Beginning\n");
                                            printf("2. Insert at End\n");
                                                    printf("3. Delete Node\n");
                                                            printf("4. Search Node\n");
                                                                    printf("5. Display List\n");
                                                                            printf("6. Exit\n");
                                                                                    printf("Enter your choice: ");
                                                                                            scanf("%d", &choice);

                                                                                                    switch (choice) {
                                                                                                                    case 1:
                                                                                                                                    printf("Enter value to insert at beginning: ");
                                                                                                                                                    scanf("%d", &value);
                                                                                                                                                                    insertAtBeginning(&head, value);
                                                                                                                                                                                    break;

                                                                                                                                                                                                case 2:
                                                                                                                                                                                                                printf("Enter value to insert at end: ");
                                                                                                                                                                                                                                scanf("%d", &value);
                                                                                                                                                                                                                                                insertAtEnd(&head, value);
                                                                                                                                                                                                                                                                break;

                                                                                                                                                                                                                                                                            case 3:
                                                                                                                                                                                                                                                                                            printf("Enter value to delete: ");
                                                                                                                                                                                                                                                                                                            scanf("%d", &key);
                                                                                                                                                                                                                                                                                                                            deleteNode(&head, key);
                                                                                                                                                                                                                                                                                                                                            break;

                                                                                                                                                                                                                                                                                                                                                        case 4:
                                                                                                                                                                                                                                                                                                                                                                        printf("Enter value to search: ");
                                                                                                                                                                                                                                                                                                                                                                                        scanf("%d", &key);
                                                                                                                                                                                                                                                                                                                                                                                                        printf("Search result: %s\n", search(head, key) ? "Found" : "Not Found");
                                                                                                                                                                                                                                                                                                                                                                                                                        break;

                                                                                                                                                                                                                                                                                                                                                                                                                                    case 5:
                                                                                                                                                                                                                                                                                                                                                                                                                                                    printf("Linked List: ");
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    display(head);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    break;

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                case 6:
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                printf("Exiting program...\n");
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                exit(0);
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                break;

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            default:
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            printf("Invalid choice! Please enter a valid option.\n");
                                                                                                    }
                }
                    
                        return 0;
}
                                                                                                    }
                }
}
                }
            }
}
            }
}
                                }
                        }
                }
}
}
            }
}
            }
}
}