Added solution for converting singly linked list to circular linked list

circular_linked_list.cpp

@@ -0,0 +1,88 @@
+#include<iostream>
+using namespace std;
+
+class Node{
+  public:
+    int data;
+    Node* next;
+    Node(int data){
+    this ->data= data;
+    next = NULL;
+  }
+};
+
+class LinkedList {
+public:
+    Node* head;
+
+    LinkedList() {
+        head = NULL;
+    }
+
+    // Function to insert node at the end of the singly linked list
+    void insert(int value) {
+        Node* newNode = new Node(value);
+
+        if (head == NULL) {
+            head = newNode;
+            return;
+        }
+
+        Node* temp = head;
+        while (temp->next != NULL) {
+            temp = temp->next;
+        }
+        temp->next = newNode;
+    }
+
+    // Convert singly linked list to circular linked list
+    void convertToCircular() {
+        if (head == NULL) return;
+
+        Node* temp = head;
+
+        // Traverse till the last node
+        while (temp->next != NULL) {
+            temp = temp->next;
+        }
+
+        // Make it circular
+        temp->next = head;
+    }
+
+    // Display function for circular linked list (print limited nodes to avoid infinite loop)
+    void displayCircular(int limit = 10) {
+        if (head == NULL) {
+            cout << "List is empty\n";
+            return;
+        }
+
+        Node* temp = head;
+        int count = 0;
+
+        while (temp != NULL && count < limit) {
+            cout << temp->data << " -> ";
+            temp = temp->next;
+            count++;
+        }
+        cout << "(back to head...)\n";
+    }
+};
+
+int main() {
+    LinkedList list;
+
+    // Insert values
+    list.insert(10);
+    list.insert(20);
+    list.insert(30);
+    list.insert(40);
+
+    cout << "Converting to Circular Linked List...\n";
+    list.convertToCircular();
+
+    // Display circular list (limited to avoid infinite loop)
+    list.displayCircular(10);
+
+    return 0;
+}