创建新循环互联列表时出现段错误。

原因是在创建新循环互联列表时，尚未将最后一个节点的'next”指针指向第一个节点。解决该问题的方法是在创建第一个节点后，向该节点添加'next”指针。如下所示：

#include <stdio.h>
#include <stdlib.h>

typedef struct Node {
   int data;
   struct Node *next;
} Node;

Node* createNewNode(int data) {
   Node *newNode = (Node*)malloc(sizeof(Node));
   if (newNode == NULL) {
      printf("Memory allocation failed");
      exit(1);
   }
   newNode->data = data;
   newNode->next = NULL;
   return newNode;
}

void createCyclicLinkedList(Node **head, int data) {
   Node *newNode = createNewNode(data);
   if (*head == NULL) { //create first node
      *head = newNode;
      newNode->next = *head;
      return;
   }
   Node *lastNode = *head;
   while (lastNode->next != *head) { //iterate to last node
      lastNode = lastNode->next;
   }
   lastNode->next = newNode;
   newNode->next = *head; //add link from last node to first node
}

void printList(Node *head) {
   if (head == NULL) {
      printf("Linked list is empty");
      return;
   }
   Node *currentNode = head;
   do {
      printf("%d ", currentNode->data);
      currentNode = currentNode->next;
   } while (currentNode != head); //print until returned to head
}

int main() {
   Node *head = NULL;
   createCyclicLinkedList(&head, 1);
   createCyclicLinkedList(&head, 2);
   createCyclicLinkedList(&head, 3);
   printList(head);
   return 0;
}

在该示例中，使用指向指针的指针来操作头节点，可以保证链表被正确创建。