Answer Posted / mani

#include<stdio.h>

typedef struct node {
int data;
struct node *leftlink;
struct node *rightlink;
}node;

node *start=NULL;
node *tail=NULL;

void add_begin(node *);
main()
{

.......
.......

add_begin(start);

.......
.......
}

void add_begin(node *temp)
{
node *new_node=NULL;
int idata;
printf("enter the data part value: ");
scanf("%d",&idata);

if(start==NULL && tail==NULL )
{
new_node=(node *)malloc(sizeof(node));
new_node->data=idata;
new_node->leftlink=NULL;
new_node->rightlink=NULL;
start=new_node;
tail=new_node;
}
else
{
new_node=(node *)malloc(sizeof(node));
new_node->data=idata;
temp->leftlink=new_node;
new_node->rightlink=temp;
new_node->leftlink=NULL;
start=newnode;
}
}

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