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Lesson9.cpp
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Lesson9.cpp
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#include<bits/stdc++.h>
#include<stdio.h>
using namespace std;
typedef struct Node
{
int data;
Node* next;
};
Node* insertn(Node* head,int d,int pos)
{
Node *temp=new Node();
temp->data=d;
temp->next=NULL;
if(pos==1)
{
temp->next=head;
head=temp;
}
else
{
Node* temp2=head;
for(int i=0; i<pos-2; i++)
{
temp2=temp2->next;
}
temp->next=temp2->next;
temp2->next=temp;
}
return head;
}
void print(Node* head)
{
Node *temp=head;
while(temp!=NULL)
{
cout<<temp->data<<" ";
temp=temp->next;
}
cout<<endl;
}
Node* deleten(Node* head, int no, int pos)
{
Node* temp1=head;
if(pos==1)
{
head=temp1->next;
}
else
{
Node* before;
for(int i=1; i<pos; i++)
{
before=temp1;
temp1=temp1->next;
}
before->next=temp1->next;
}
return head;
}
Node* reversell(Node*head)
{
Node *cur=head;
Node* prev=NULL;
Node*next;
while(cur!=NULL)
{
next=cur->next;
cur->next=prev;
prev=cur;
cur=next;
}
head=prev;
return head;
}
int main()
{
Node *head;
int no;
int pos;
int option;
head =NULL;
while(1)
{
cout<<"1. insert at nth position"<<endl<<"2.print"<<endl<<"3.delete node"<<endl<<"4.reverse ll"<<endl;
cout<<"select an option"<<endl;
cin>>option;
if(option==1)
{
cout<<"Enter data"<<endl;
cin>>no;
cout<<"enter position"<<endl;
cin>>pos;
head=insertn(head,no,pos);
}
else if(option==2)
{
print(head);
}
else if(option==3)
{
cout<<"enter position"<<endl;
cin>>pos;
head=deleten(head,no,pos);
}
else if(option==4)
{
head=reversell(head);
}
}
}