program to create insert, delete and display operations on singly linked list in c

#include<conio.h>
#include<stdio.h>

struct node
{
    int i;
    struct node *next;
};

void main()
{

    struct node *first;
    struct node *last;

    struct node *temp;
    int ch,user,add,cnt=0,t=0;
    struct node *p;

    clrscr();

    printf("\n\t 1.CREATION");
    printf("\n\t 2.INSERT AT STARTING");
    printf("\n\t 3.INSERT AT MIDDLE(USER'S CHOICE)");
    printf("\n\t 4.INSERT AT END");
    printf("\n\t 5.DELETE 1ST NODE");
    printf("\n\t 6.DELETE LAST NODE");
    printf("\n\t 7.DELETE MIDDLE NODE(USER'S CHOICE)");
    printf("\n\t 8.DISPLAY");
    printf("\n\t 10.EXIT");
    scanf("%d",&user);

    while(user!=10)
    {
      if(user==1)
      {
        printf("\n\t ENTER DATA  ::: ");
        first=(struct node*)malloc(sizeof(struct node));
        scanf("%d",&ch);

        first->i=ch;
        first->next=0;
        p=first;
        cnt=1;
      }
      if(user==2)
      {
            p=(struct node*)malloc(sizeof(struct node));
            printf("\n\t ENTER DATA FOR 1ST NODE");
            scanf("%d",&p->i);
            p->next=first;
            first=p;
            cnt++;
      }
      if(user==4)
      {
            p=(struct node*)malloc(sizeof(struct node));
            printf("\n\t ENTER DATA FOR LAST NODE");
            scanf("%d",&p->i);
            temp=first;
            while(temp->next!=0)
            {
                temp=temp->next;
            }
            temp->next=p;
            p->next=0;
            cnt++;
      }
      if(user==3)
      {
            printf("\n\t ENTER ANY ADDRESS BETWEEN 1 and %d",cnt);
            scanf("%d",&add);

            t=1;
            p=first;
            while(t!=add)
            {
                p=p->next;
                t++;
            }
            temp=(struct node*)malloc(sizeof(struct node));
            printf("\n\t ENTER DATA FOR NODE");
            scanf("%d",&temp->i);
            temp->next=p->next;
            p->next=temp;
            cnt++;
      }
      if(user==5)
      {
            p=first;
            first=p->next;
            free(p);
      }
      if(user==6)
      {
        p=first;
        while(p->next->next!=0)
        {
            p=p->next;
        }
        p->next=0;
        free(p->next->next);
      }
      if(user==8)
      {
        p=first;
        while(p!=0)
        {
            printf("\n\t %d",p->i);
            p=p->next;
        }
      }
      if(user==7)
      {
            printf("\n\t ENTER ANY ADDRESS BETWEEN 1 and %d",cnt);
            scanf("%d",&add);

            t=1;
            p=first;
            while(t<add-1)
            {
                p=p->next;
                t++;
            }
            temp=p->next;
            p->next=temp->next;
            free(temp);
            cnt--;

      }
      printf("\n\t 1.CREATION");
      printf("\n\t 2.INSERT AT STARTING");
      printf("\n\t 3.INSERT AT MIDDLE(USER'S CHOICE)");
      printf("\n\t 4.INSERT AT END");
      printf("\n\t 5.DELETE 1ST NODE");
      printf("\n\t 6.DELETE LAST NODE");
      printf("\n\t 7.DELETE MIDDLE NODE(USER'S CHOICE)");
      printf("\n\t 8.DISPLAY");
      printf("\n\t 10.EXIT");
      scanf("%d",&user);
       }
       getch();
}