all_operation_on_singly_linked_list
// all basic operation retleted to singly linked list
#include<bits/stdc++.h>
using namespace std;
class node{
public:
int data;
node* next;
node(int val){
data=val;
next=NULL;
}
};
void insertAtTail(node* &head, int val){
node* n=new node(val);
node* temp=head;
if(head==NULL){
head=n;
return;
}
while(temp->next!=NULL){
temp=temp->next;
}
temp->next=n;
}
void display(node* head){
node* temp=head;
while(temp!=NULL){
cout<<temp->data<<"->";
temp=temp->next;
}
cout<<"NULL"<<endl;
}
void insertAtHead(node* &head, int val){
node* n=new node(val);
node* temp=head;
if(temp==NULL){
head=n;
return;
}
n->next=head;
head=n;
}
void insertAtAnywhere(node* &head, int preVal, int val){
node* n=new node(val);
node* temp=head;
while(temp->data!=preVal){
temp=temp->next;
}
node* temp1=temp->next;
temp->next=n;
n->next=temp1;
}
void deleteAtHead(node* &head){
if(head==NULL){
cout<<"linked list is empty no element here to delete"<<endl;
}
node* todelete=head;
head=head->next;
delete(todelete);
}
void deleteAtTail(node* &head){
if(head==NULL){
return;
}
if(head->next==NULL){
delete(head);
return;
}
node* second_last=head;
while(second_last->next->next!=NULL){
second_last=second_last->next;
}
delete(second_last->next);
second_last->next=NULL;
}
void deleteAnyWhere(node* &head, int val){
if(head==NULL){
return;
}
if(head->next==NULL){
delete(head);
return;
}
node* temp=head;
while(temp->next->data!=val){
temp=temp->next;
}
node* todelete=temp->next;
temp->next=temp->next->next;
delete(todelete);
}
bool searchElement(node* &head, int key){
if(head==NULL){
return false;
}
bool flag=false;
node* temp=head;
while(temp!=NULL){
if(temp->data==key){
flag=true;
break;
}
temp=temp->next;
}
return flag;
}
void reverseElement(node* &head){
node* current=head;
node* prev=NULL;
node* next=NULL;
while(current!=NULL){
next=current->next;
current->next=prev;
prev=current;
current=next;
}
head=prev;
}
int main(){
node* head=NULL;
insertAtTail(head, 1);
insertAtTail(head, 2);
insertAtTail(head, 3);
insertAtTail(head, 4);
display(head);
insertAtHead(head, 5);
display(head);
insertAtAnywhere(head, 2, 6);
display(head);
cout<<"from here all deletion program will be performed"<<endl;
deleteAtHead(head);
display(head);
deleteAtTail(head);
display(head);
deleteAnyWhere(head, 6);
display(head);
cout<<searchElement(head, 3)<<endl;
reverseElement(head);
display(head);
return 0;
}
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