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/defining a structure
struct node
{
int item;
struct node *next;
};
//including header file
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
//A function for creating  link list 
int createlinklist(struct node *start)
{
int item;
printf("at the end node you can enter -20\n");
printf("enter your item\n");
scanf("%d",&item);
if(start==NULL)
printf("no linked list became created\n");
else
{
start->item=item;
if(start->item==-20)
{
start->next=NULL;
return(0);
};
start->next=(struct node *)malloc(sizeof(struct node));
createlinklist(start->next);
}
}
//A function for insertion an element in link list
struct node* insert_At_first(struct node *start,int item)
{
	struct node *temp;
	struct node *newnode=(struct node*)malloc(sizeof(struct node));
	newnode->item=item;
	if(start==NULL)
	start=newnode;
	temp=start;
	start=newnode;
	newnode->next=temp;
	return(start);
}
//function for deleting the node
struct node* delete_first(struct node *start)
{
	if(!start)
	return(0);
    struct node *temp;
    temp=start;
    start=start->next;
    free(temp);
	return(start);
}
//A function for printing the list
int printlist(struct node *start)
{
	if(start==NULL)
	return(0);
printf("%d\n",start->item);
printlist(start->next);
}
//a function for searching an element
int search(struct node *start,int item)
{
	struct node *current=start;
	while(current!=NULL)
	{
	if(current->item==item)
	printf("item is present\n");
	return(0);
	current=current->next;
    }	
    printf("item is not present\n");
    return(0);
}
//main function for using above function
int main()
{
int item,choice;
struct node *start=(struct node*)malloc(sizeof(struct node));
while(1)
{
printf("1.create linklist\n2.insert at first\n3.delete from the first\n4.print list\n5.search element\n6.exit\n");
printf("enter the number for choice\n");
scanf("%d",&choice);	
switch(choice)
{
	case 1:
		createlinklist(start);
		break;
	case 2:
		printf("enter the element to which you want insert at first\n");
		scanf("%d",&item);
		start=insert_At_first(start,item);
		break;
	case 3:
		start=delete_first(start);
		break;
	case 4:
		printlist(start);
		break;
	case 5:
		printf("enter an item to which you want to search\n");
		scanf("%d",&item);
		search(start,item);
		break;
	case 6:
		exit(1);
}
}
}