link list HW

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

typedef struct data
{
    int a;
    struct data *next;
} data;
data *head=NULL;
void fst(int x)
{
    data *new =(data*)malloc(sizeof(data));
    new->a=x;
    new->next=NULL;
    if(head==NULL)
    {
        head=new;
        return;
    }
    new->next=head;
    head=new;
}
void end(int x)
{
    data *new =(data*)malloc(sizeof(data));
    new->a=x;
    new->next=NULL;
    if(head==NULL)
    {
        head=new;
        return;
    }
    data *temp=head;

    while(temp->next!=NULL)
    {
        temp=temp->next;
    }
    temp->next=new;
}
void nth(int n,int x)
{
    data *new =(data*)malloc(sizeof(data));
    new->a=x;
    new->next=NULL;
    if(n==1)
    {
        new->next=head;
        head=new;
        return;
    }
    data *temp=head;
    n=n-2;
    while(n-- && temp->next!=NULL)
    {
        temp=temp->next;
    }
    new->next=temp->next;
    temp->next=new;
}
void dbp(int n)
{
    int count=0;
    data *del=NULL;
    data *temp=head;
    if(n==1)
    {
        del=head;
        head=head->next;
        free(del);
    }
    n=n-2;
    while(n-- && temp->next!=NULL)
    {
        temp=temp->next;
        count++;
    }
    if(temp->next==NULL)
    {

        return;
    }

    del=temp->next;
    temp->next=del->next;
    free(del);

}


void dbv(int x)
{

    data *del=NULL;
    data *temp=head;
    if(head->a==x)
    {
        del=head;
        head=del->next;
        free(del);
        return;
    }

    else if(head->a!=x && temp->next==NULL)
    {
        while(temp->next->a!=x)
        {
            temp=temp->next;
        }
        del=temp->next;
        temp->next=del->next;
        free(del);

    }
    else
        return;

}

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

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

    }
    return s/count;
}


void print()
{
    data *temp=head;


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

}

int main()
{
    /*end(1212);
    fst(9);
    end(10);
    fst(8);
    end(11);
    print();

    nth(1,111);
    print();

    printf("Sum=%d\n",sum());
    printf("Averaxe=%.2lf \n",avrg());

    dbp(7);
    print();

    dbv(111);
    print();

    dbv(8);
    print();

    dbv(9);
    print();


    printf("Sum=%d \n",sum());

    printf("Averaxe=%.2lf \n",avrg());*/
    while(1)
    {
        int n, m,y;
        char p;
        printf("ASSALAMUALAIKUM...\nWhat u wanna do ?\n1.WANNA INSERT AT FIRST?\n2.WANNA INSERT AT END?\n");
        printf("3.WANNA INSERT AT ANY POSITION ?\n4.WANNA DELETE BY POSITION ?\n5.WANNA DELETE BY VALUE?\n6.Wanna Print These All?\n");
        printf("SELECT ANY OPTION FROM 1 to 6 OR 0(zero) TO QUIT .\n");
        scanf("%d",&m);
        if(m==1 || m==2 || m==4 || m==5)
        {
            printf("Please Enter a Number->");

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

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

            }
            else if(m==4)
            {
                scanf("%d",&y);
                dbp(y);

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

            }

        }
        else if(m==3)
        {

            printf("Enter the specific position=>");

            scanf("%d",&n);
            printf("Enter a Number What you wanna insert=>");
             scanf("%d",&y);
            nth(n,y);
        }
        else if(m==6)
        {
            print();
        }
        else if(m==0)
        {
            printf("Thank You For Staying With Mufty :> \n\n\n");
            break;
        }



    }

}