stack using linked lists

#include<stdio.h>
#include<conio.h>

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

void push(int);
void pop();
void display();

void main()
{
   int choice, value;

   printf("\n:: Stack using Linked List ::\n");
   while(1)
    {
      printf("\n****** MENU ******\n");
      printf("1. Push\n2. Pop\n3. Display\n4. Exit\n");

      printf("Enter your choice: ");
      scanf("%d",&choice);

      switch(choice)
      {
            case 1: printf("Enter the value to be insert: ");
                    scanf("%d", &value);
                    push(value);
                    break;
            case 2:
                    pop();
                    break;
            case 3:
                    display();
                    break;
            case 4:
                    exit(0);
            default:
                    printf("\nWrong selection!!! Please try again!!!\n");
      }
   }
}
void push(int value)
{
   struct Node *newNode;
   newNode = (struct Node*)malloc(sizeof(struct Node));
   newNode->data = value;
   if(top == NULL)
      newNode->next = NULL;
   else
      newNode->next = top;
   top = newNode;
   printf("\nInsertion is Success!!!\n");
}
void pop()
{
   if(top == NULL)
      printf("\nStack is Empty!!!\n");
   else
    {
      struct Node *temp = top;
      printf("\nDeleted element: %d", temp->data);
      top = temp->next;
      free(temp);
   }
}
void display()
{
   if(top == NULL)
      printf("\nStack is Empty!!!\n");
   else{
      struct Node *temp = top;
      while(temp->next != NULL){
printf("%d--->",temp->data);
temp = temp -> next;
      }
      printf("%d--->NULL",temp->data);
   }
}

OUTPUT :-

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