LinkedListCycle added

LinkedListCycle.c

@@ -0,0 +1,50 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<stdbool.h>
+struct ListNode{
+    int data;
+    struct ListNode* next;
+};
+bool hasCycle(struct ListNode *head) {
+    if(head==NULL||head->next==NULL) 
+    {
+    return false;
+    } 
+ struct ListNode* ptr=(struct ListNode*)malloc(sizeof(struct ListNode*));
+ struct ListNode* ptrf=(struct ListNode*)malloc(sizeof(struct ListNode*));
+    ptrf=head;
+    ptr=head->next;  
+  while(ptr!=NULL && ptr->next != NULL)
+   {
+   if(ptrf == ptr)
+   {
+    return true;
+   }
+   ptrf=ptrf->next;
+   ptr=ptr->next->next;
+   }
+   return false;
+}
+int main()
+{
+    struct ListNode * head = (struct ListNode*)malloc(sizeof(struct ListNode));
+    struct ListNode * secondNode = (struct ListNode*)malloc(sizeof(struct ListNode));
+    struct ListNode * thirdNode = (struct ListNode*)malloc(sizeof(struct ListNode));
+    struct ListNode * fourthNode = (struct ListNode*)malloc(sizeof(struct ListNode));
+
+    head->data = 3;
+    head->next = secondNode;
+
+    secondNode->data = 6;
+    secondNode->next = thirdNode;
+
+    thirdNode->data = 0;
+    thirdNode->next = fourthNode;
+
+    fourthNode->data = -2;
+    fourthNode->next = NULL;
+    bool h;
+    h = hasCycle(head);
+    printf("%d", h);
+    return 0;
+}