Linked List and Implementation of Singly Linked List

singly_linked_list_implementation.c

// Written by: Md. Maruf Sarker
// Platform: Arch Linux
// Problem: Linked List and Implementation of Singly Linked List
// Language: c
// Date: 2022-11-13

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

struct Node{
    int data;
    struct Node *next;
}*head = NULL;

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 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);
    }
}
int main(){
    int choice,value,choice1,loc1,loc2;
    while(1){
        mainMenu: 
        printf("\n\n****** MENU ******\n1. Insert\n2. Display\n3. 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\nEnter your choice: ");
            scanf("%d",&choice1);
            
            switch(choice1){
                case 1:
                    insertAtBeginning(value);
                    break;
                case 2:
                    insertAtEnd(value);
                    break;
                default:
                    printf("\nWrong Input!! Try again!!!\n\n");
                    goto mainMenu;
                }
                goto subMenuEnd;
        }
            subMenuEnd:
            break;
        case 2:
            display();
            break;
        case 3:
            exit(0);
        default:
            printf("\nWrong input!!! Try again!!\n\n");
        }
}
return 0;
}