Answer Posted / anitha

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

struct node
{
int data;
struct node*next;
};
int main()
{
struct node *head=NULL,*temp,*tp;
int element,ch,target;
clrscr();
do
{
printf("1.insert@first\n2.@last\n3.@middle\n4.delete\n5.display\n");
scanf("%d",&ch);
switch(ch)
{
case 1:
scanf("%d",&element);
temp=(struct node *)malloc(sizeof(struct node));
temp->data=element;
temp->next=NULL;
if(head==NULL)
{
head=temp;//creation of one node
}
else
{
temp->next=head; //insert @first
head=temp;
}

break;

case 2:

scanf("%d",&element);
temp=(struct node *)malloc(sizeof(struct node));
temp->data=element;
temp->next=NULL;
if(head==NULL)
{
head=temp;//creation of one node
}

else
{
tp=head;
while(tp->next!=NULL)
{
tp=tp->next; //traversing the list
}
tp->next=temp; //insert @last
}
break;
case 3:

scanf("%d%d",&element,&target);
temp=(struct node *)malloc(sizeof(struct node));
temp->data=element;
temp->next=NULL;
if(head==NULL)
{
head=temp;//creation of one node
}

else
{
tp=head;
while(tp->data!=target && tp!=NULL)
{
tp=tp->next; //traversing the list
}
temp->next=tp->next;
tp->next=temp; //insert @middle
}
break;
case 4:
scanf("%d",&target);

if(head==NULL)
{
printf("list is empty");
}

else
{
tp=head;
while(tp->data!=target && tp!=NULL)
{
temp=tp;
tp=tp->next; //traversing the list
}

if(tp!=NUlL)
{
if(tp==head)//delete @first
{
head=head->next;
free(tp);
}
else
{

temp->next=tp->next;
tp->next=temp; //delete @middle and @last
}
else
{
printf("target not found");
}
}
break;
}
}while(ch<=4);
getch();
}

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