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circularlinklist.cpp
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circularlinklist.cpp
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#include<iostream>
using namespace std;
struct node
{
int info;
node * next;
};
class list
{
node * head;
node * temp;
node * temp1;
public:
list();
~list();
void insert1();
void insertall();
void deleteall();
void deleteone();
void reverse();
void search();
void print();
bool isempty();
};
int main()
{
list l1;
int ch;
bool isempty;
while(1){
cout << "Enter your desired operation:" << endl;
cout << "0. To Exit" << endl;
cout << "1. To insert something 1 time:" << endl;
cout << "2. To insert something evertime:" << endl;
cout << "3. To delete something 1 time:" << endl;
cout << "4. To delete something everytime:" << endl;
cout << "5. To search something:" << endl;
cout << "6. To Print the whole List:" << endl;
cout << "7. To check if list is empty:" << endl;
cout << "8. To reverse the list" << endl << endl;
cout << "Press : ";
cin >> ch;
if(ch == 0)
return 0;
if(ch>0 && ch<9){
switch (ch)
{
case 1:
l1.insert1();
break;
case 2:
l1.insertall();
break;
case 3:
l1.deleteone();
break;
case 4:
l1.deleteall();
break;
case 5:
l1.search();
break;
case 6:
l1.print();
break;
case 7:
isempty = l1.isempty();
if(isempty){
cout << "List is empty" << endl;
}
else{
cout<<"List is not empty" << endl;
}
break;
case 8:
l1.reverse();
break;
}
}
else{
cout << "Invalid number" << endl << endl;
}
}
return 0;
}
list::list()
{
head = temp1 = temp = NULL;
}
list::~list()
{
if(head == NULL)
return;
temp = temp1 = head->next;
while (temp != head)
{
temp = temp->next;
delete temp1;
temp1 = temp;
}
delete head;
head = temp = temp1 = NULL;
}
void list::insert1()
{
int key, data;
cout << "Enter the key: ";
cin >> key;
cout << "Enter the Data: ";
cin >> data;
if(head == NULL){
head = new node;
head->info = data;
head->next = head;
return;
}
temp = head;
do
{
if(temp->info == key){
temp1 = new node;
temp1->info = data;
temp1->next = temp->next;
temp->next = temp1;
return;
}
temp = temp->next;
} while (temp->next != head);
}
void list::insertall()
{
int key, data;
cout << "Enter the key: ";
cin >> key;
cout << "Enter the Data: ";
cin >> data;
if(head == NULL){
head = new node;
head->info = data;
head->next = head;
return;
}
temp = head;
do
{
if(temp->info == key){
temp1 = new node;
temp1->info = data;
temp1->next = temp->next;
temp->next = temp1;
temp = temp1->next;
continue;
}
temp = temp->next;
} while (temp != head);
}
void list::deleteone()
{
int data;
cout << "Enter the Data: ";
cin >> data;
if(head == NULL)
return;
if(head->info == data){
if(head->next == head){
delete head;
temp = head = temp1 = NULL;
return;
}
temp1 = head;
temp = head->next;
while(temp->next != temp1)
temp = temp->next;
head = head->next;
temp->next = head;
delete temp1;
temp1 = NULL;
return;
}
temp = head;
do
{
if(temp->next->info == data){
temp1 = temp->next;
temp->next = temp1->next;
delete temp1;
temp1 = NULL;
return;
}
temp = temp->next;
}while (temp != head);
}
void list::deleteall()
{
int data;
cout << "Enter the Data: ";
cin >> data;
if(head == NULL)
return;
temp1 = temp = head;
while(head->info == data){
if(head->next == head){
delete head;
temp = head = temp1 = NULL;
return;
}
while(temp->next != head)
temp = temp->next;
head = head->next;
temp->next = head;
delete temp1;
temp1 = head;
}
temp1 = temp = head;
do
{
if(temp->next->info == data){
temp1 = temp->next;
temp->next = temp1->next;
delete temp1;
temp1 = NULL;
continue;
}
temp = temp->next;
temp1 = temp;
}while (temp != head || temp1 == NULL);
}
void list::search()
{
int data;
cout << "Enter the Data: ";
cin >> data;
if(head == NULL){
cout << "List is empty" << endl;
return;
}
temp = head;
do
{
if(temp->info == data){
cout << "Found the item." << endl;
return;
}
temp = temp->next;
} while (temp != head);
}
void list::print()
{
if(head == NULL){
cout << "[ ]" << endl;
return;
}
temp = head;
cout << "[ ";
do
{
cout << temp->info;
temp = temp->next;
if(temp != head)
cout << " , ";
} while (temp != head);
cout << " ]" << endl;
}
bool list::isempty()
{
if(head == NULL)
return true;
return false;
}
void list::reverse()
{
temp1 = NULL;
temp = head->next;
while(temp->next != NULL)
{
head->next = temp1;
temp1 = head;
head = temp;
temp = temp->next;
}
temp->next = head;
}