创建链表以输入-1结束c语言

实现如下：

#include<stdio.h>
#include<stdlib.h>
 
typedef struct Node {
    int val;
    struct Node *next;
} Node;
 
int main() {
    Node *head = NULL;
    Node *tail = NULL;
    int num;
    scanf("%d", &num);//先读入一个数
    while (num != -1) {
        Node *node = (Node *)malloc(sizeof(Node));
        node->val = num;
        node->next = NULL;
        if (head == NULL) {//插入第一个节点
            head = node;
            tail = node;
        } else {
            tail->next = node;
            tail = node;
        }
        scanf("%d", &num);//再读入一个数
    }
    //输出链表
    Node *p = head;
    while (p != NULL) {
        printf("%d ", p->val);
        p = p->next;
    }
    printf("\n");
    //释放链表内存
    p = head;//从头开始释放内存
    while (p != NULL) {
        Node *q = p;
        p = p->next;
        free(q);
    }
 
    return 0;
}