#include<stdio.h>
#include<stdlib.h>
struct teacher
{
    int id;
    char name[20];
    struct teacher *next,*prev;

}*start1=NULL,*end1=NULL,*current;
void create()
{
    struct teacher *new_node;
    if(start1==NULL && end1==NULL)
    {
        new_node=(struct teacher*)malloc(1*sizeof(struct teacher));
        printf("\nEnter the number of teacher id:\n");
        scanf("%d",&new_node->id);
        printf("\nEnter the teacher name:\n");
        scanf("%s",&new_node->name);
        new_node->next=NULL;
        new_node->prev=NULL;
        current=start1;
        start1=new_node;
        new_node->next=current;
        current->prev=new_node;

    }
    else
    {
        new_node=(struct teacher*)malloc(1*sizeof(struct teacher));
        printf("Enter the number of teacher id:\n");
        scanf("%d",&new_node->id);
        printf("Enter the teacher name:\n");
        scanf("%s",&new_node->name);
        new_node->next=NULL;
        new_node->prev=NULL;
        current->next=new_node;
        new_node->prev=current;
        current=new_node;
        end1=new_node;
    }



}
void f_display()
{
    struct teacher *c;
    c=start1;
    while(c!=NULL)
    {
        printf("%d\n",c->id);
        printf("%s\n",c->name);
        c=c->next;
    }
}
void l_display()
{
    struct teacher *c;
    c=end1;
    while(c!=NULL)
    {
        printf("%d\n",c->id);
        printf("%s\n",c->name);
        c=c->prev;
    }
}
int main()
{
    int x;
    while(1)
    {
        printf("\n1.create\n");
        printf("\n2.Display\n");
        printf("\nEnter your choose:\n");
        scanf("%d",&x);
        switch(x)
        {
        case 1:
        {
            create();
            break;
        }
        case 2:
        {
            f_display();
            break;
        }
        case 3:
        {
            l_display();
            break;
        }
        }
    }

}