c语言链表动态分配内存代码

当我们在C语言中使用链表时，通常需要动态分配内存来创建节点。以下是一个简单的示例代码，用于创建链表节点并动态分配内存：

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

// 定义链表节点结构
struct Node {
    int data;
    struct Node* next;
};

// 创建链表节点
struct Node* createNode(int data) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    if (newNode == NULL) {
        printf("内存分配失败！\n");
        exit(1);
    }
    newNode->data = data;
    newNode->next = NULL;
    return newNode;
}

int main() {
    // 创建链表节点
    struct Node* head = createNode(1);
    struct Node* second = createNode(2);
    struct Node* third = createNode(3);

    // 构建链表
    head->next = second;
    second->next = third;

    // 遍历链表并打印节点数据
    struct Node* current = head;
    while (current != NULL) {
        printf("%d ", current->data);
        current = current->next;
    }

    // 释放内存
    free(head);
    free(second);
    free(third);

    return 0;
}