用C语言实现循环单链表的增删改查

可以使用结构体来实现循环单链表，具体实现方法如下：

1. 定义结构体

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

2. 初始化链表

Node *head = NULL;
head = (Node*)malloc(sizeof(Node));
head->next = head;

3. 插入节点

Node *p = head;
while(p->next != head){
p = p->next;
}
Node *newNode = (Node*)malloc(sizeof(Node));
newNode->data = value;
newNode->next = head;
p->next = newNode;

4. 删除节点

Node *p = head;
while(p->next != head && p->next->data != value){
p = p->next;
}
if(p->next == head){
printf("节点不存在");
}else{
Node *temp = p->next;
p->next = temp->next;
free(temp);
}

5. 修改节点

Node *p = head;
while(p->next != head && p->next->data != oldValue){
p = p->next;
}
if(p->next == head){
printf("节点不存在");
}else{
p->next->data = newValue;
}

以上就是用C语言实现循环单链表的增删改查的方法。