del pos

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

typedef struct node
{

    int a;
    char ch;
    struct node*next;
    struct node*previous;
} node;
node*head;
void display()
{

    node *list=head;
    while(list !=NULL)
    {
        printf("A: %d\n",list->a);
        printf("C: %c\n",list->ch);
        printf("\n");

        list=list->next;

    }
}
void insert_at_end(int aN,char chN)
{

    node*N=(node*)malloc(sizeof(node));
    N->a=aN;
    N->ch=chN;
    N->next=NULL;
    N->previous=NULL;
    node*list=head;
    if(head==NULL)
    {
        head=N;
    }
    else
    {
        while(list->next!=NULL)
        {
            list=list->next;
            N->previous=list;
        }
        list->next=N;
        N->next=NULL;
        N->previous=list;


    }

}
 void delete_pos(int pos)
{
    node *list=head,*temp=NULL,*tail;


    if(pos==1)
    {
        if(list->next==NULL)
        {
            printf("DATA DELETED\n\n");
            free(list);
        }
        else
        {
            head=list->next;
            head->previous=NULL;
            printf("DATA DELETED\n\n");
            free(list);
        }
    }
    else
    {
        pos=pos-2;
        while(pos!=0 && list->next!=NULL)
        {
            list=list->next;
            pos--;
            if(list==NULL)
            {
                printf("NO DATA FOUND!!\n\n");
                break;
            }
        }
        if(list->next==NULL)
        {
            printf("You Choose Wrong Position!!\n\n");
        }
        else if(list==NULL && pos==0)
        {
            temp=tail;
            tail=temp->previous;
            tail->next=NULL;
            printf("DATA DELETED\n\n");
            free(temp);
        }
        else if(list!=NULL && pos==0)
        {
            temp=list->next;
            temp->next->previous=list;
            list->next=temp->next;
            printf("DATA DELETED\n\n");
            free(temp);
        }
   }
}

int main()
{
    head=NULL;
    int x,af,l;
    char cf;
    insert_at_end(1,'A');
    insert_at_end(3,'b');
    insert_at_end(5,'c');
    insert_at_end(7,'d');
    insert_at_end(9,'e');
    printf("position:");
    scanf("%d",&x);
     delete_pos(x);
    display();
}