Doubly by Mufty-13329

#include<stdio.h>
#include<stdlib.h>
typedef struct data
{
    int a;
    struct data *prev;
    struct data *next;

} data;

data *head=NULL;
data *tail=NULL;

void ins_at_first(int x)
{
    data *new_node=(data*)malloc(sizeof(data));
    new_node->a=x;
    new_node->prev=NULL;
    new_node->next=NULL;

    if(head==NULL)
    {
        head=new_node;
    }
    else if(head!=NULL)
    {

        head->prev=new_node;
        new_node->next=head;
        head=new_node;

    }

}

void ins_at_end(int x)
{
    data *new_node=(data*)malloc(sizeof(data));
    new_node->a=x;
    new_node->prev=NULL;
    new_node->next=NULL;

    if(head==NULL)
    {
        head=new_node;
    }
    else if(head!=NULL)
    {
        data *temp=head;

        while(temp->next!=NULL)
        {
            temp=temp->next;
        }

        new_node->prev=temp;
        temp->next=new_node;

    }

}

void ins_at_nth(int n,int x)
{
    data *new_node=(data*)malloc(sizeof(data));
    new_node->a=x;
    new_node->prev=NULL;
    new_node->next=NULL;

    if(head==NULL)
    {
        head=new_node;
        return;
    }
    if(n==1 && head!=NULL)
    {
        new_node->next=head;
        head->prev=new_node;
        head=new_node;
        return;
    }

    n=n-2;
    data *temp=head;
    while(n--)
    {
        temp=temp->next;
        if(temp->next=NULL)
        {
            new_node->prev=temp;
            temp->next=new_node;
            return;
        }
    }
    temp->next->prev=new_node;
    new_node->next=temp->next;
    new_node->prev=temp;
    temp->next=new_node;

}

void del_by_pos(int n)

{


    data *temp=head;
    data *delx=NULL;
    if(head==NULL)
    {
        printf("\n==>Wrong Command\n");
        return;
    }
    if(n==1)
    {
        head=head->next;

        if(head==NULL)
        {
            tail=NULL;
            free(delx);
            return;
        }
        head->prev=NULL;
        free(delx);
        return;

    }
    n=n-2;

    while(n--)
    {
        temp=temp->next;
        if(temp->next==NULL)
        {
            printf("\nSorrrrry ,No Node to delete\n");
            return;
        }

    }
    data *del=head->next;
    head->next=del->next;
    free(del);
}

void del_by_value(int x)
{
    //Sorry Sir,4.00am submit er last Time. Ekhn 3.54 am hoye gece. Time er jonno complete korte parlm na..
}

int sum()
{
    int s=0;
    data *temp=head;
    while(temp!=NULL)
    {
        s+=temp->a;
        temp=temp->next;
    }
    return s;

}
double avrg()
{
    int count=0;
    double s=0;
    data *temp=head;

    while(temp!=NULL)
    {
        s+=temp->a;
        count++;
        temp=temp->next;
    }
    if(count==0)
    {
        printf("\nInput some Value First.\n");
        return 0;
    }
    return s/count;

}


void reset(int x)
{
    head=NULL;
    return;
}

void print()
{
    data *temp=head;

    while(temp!=NULL)
    {
        printf("%d ",temp->a);
        temp=temp->next;
    }
    if(head==NULL)
    {
        printf("Result is NULL.");
    }
    printf("\n");

}

int main()
{
    /* ins_at_nth(1,100);
     print();
     ins_at_end(6);
     ins_at_first(5);
     ins_at_first(4);
     ins_at_first(3);
     ins_at_end(6);
     ins_at_nth(2,600);
     print();

     del_by_pos(3);

     print();


    */


    printf("Hey ,ASSALAMUALAIKUM...\n");
    while(1)
    {
        int n, m,y;
        char p;
        printf("\nWhat u wanna do?\n\n");
        printf("1.WANNA INSERT AT FIRST?\n");
        printf("2.WANNA INSERT AT END?\n");
        printf("3.WANNA INSERT AT ANY POSITION?\n");
        printf("4.WANNA DELETE BY POSITION ?\n");
        printf("5.WANNA DELETE BY VALUE?[**incompleted**]\n");
        printf("6.Wanna Print Sum Of These?\n");
        printf("7.Wanna Print Average Of These All?\n");
        printf("8.Wanna Print These All?\n\n");

        printf("##SELECT ANY OPTION FROM 1 to 8##\n");
        printf("OR 9 to Reset All?\n");
        printf("###Otherwise Enter 0(zero) TO QUIT !!!###\n");
        scanf("%d",&m);
        if(m==1 || m==2 || m==5)
        {
            printf("\nPlease Enter a Number->");

            if(m==1)
            {
                scanf("%d",&y);
                ins_at_first(y);

            }
            else if(m==2)
            {
                scanf("%d",&y);
                ins_at_end(y);

            }

            /*    else if(m==5)
               {
                scanf("%d",&y);
                   dbv(y);

               }
               */

        }
        else if(m==3)
        {

            printf("\nEnter the specific position=> ");

            scanf("%d",&n);
            printf("\nEnter a Number What you wanna insert=> ");
            scanf("%d",&y);
            ins_at_nth(n,y);
        }
        else if(m==4)
        {
            printf("\nPlease Enter a Position-> ");
            scanf("%d",&y);
            del_by_pos(y);

        }

                else if(m==6)
                {
                    printf("Sum is =%d\n",sum());
                }
                else if(m==7)
                {
                    printf("Average is=%.2lf\n",avrg());
                }

        else if(m==8)
        {
            printf("Here is the result=> ");
            print();
        }
        else if(m==9)
        {
            printf("\nReset Successfully\n\n");
            reset(0);
        }

        else if(m==0)
        {
            printf("Thanks For Staying With Mufty :> \n\n\n");
            break;
        }
    }

}