Singly Updated

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

typedef struct data
{
    int a;
    struct data *next;
} data;
data *head=NULL;
//Inser At First
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 || head==NULL)
    {
        if(head==NULL)
        {
            printf("!!! Caution:Given Position is not avavilable .\nThat's why your input was placed at the 1st Position\n\n");
        }
        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)
{

    data *del=NULL;
    data *temp=head;
    if(head==NULL)
    {
        printf("\nSorry, nothing to delete\n\n");
        return;
    }
    if(n==1)
    {
        del=head;
        head=head->next;
        free(del);
    }

    n=n-2;

    while(n-- && temp->next!=NULL)
    {
        temp=temp->next;
        if(temp->next==NULL)
        {
            return;
        }

    }
    if(temp->next==NULL)
        {
            printf("\nSorry, nothing to delete\n\n");
            return;
        }
    del=temp->next;
    temp->next=del->next;
    free(del);

}

//delete by value

void dbv(int x)
{

    data *del=NULL;
    data *temp=head;
    if(head==NULL)
    {
        printf("\nSorry, nothing to delete\n\n");
        return;
    }
    if(head->a==x)
    {
        del=head;
        head=del->next;
        free(del);
        return;
    }
    while(temp->next->a!=x)
    {
        temp=temp->next;
        if(temp->next==NULL)
        {
            printf("\nSorry, nothing to delete\n\n");
            return;
        }
    }
    del=temp->next;
    temp->next=del->next;
    free(del);




}

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

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

    }
    if(count==0)
    {
        printf("\nYou have not Input Any Value YET.\n");
        printf("***Please Chose Another option...***\n");
        return 0;
    }
    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);4
    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());
    */

    printf("\nHey ,ASSALAMUALAIKUM...\n");
    while(1)
    {
        int n, m,y;
        char p;
        printf("\n\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?\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\n");
        printf("###OR 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);
                fst(y);

            }
            else if(m==2)
            {
                scanf("%d",&y);
                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);
            nth(n,y);
        }
        else if(m==4)
        {
            printf("\nPlease Enter a Position-> ");
            scanf("%d",&y);
            dbp(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==0)
        {
            printf("Thanks For Staying With Mufty :> \n\n\n");
            break;
        }
    }

}