使用C++写一段区块链的代码

我很乐意回答您的问题，以下是一段使用 C 语言实现的简单区块链代码：

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

#define BLOCK_SIZE 512   // 区块大小
#define HASH_SIZE 64     // hash 值大小

typedef struct Block {
    int index;                  // 区块链索引
    time_t timestamp;           // 时间戳
    char data[BLOCK_SIZE];      // 数据
    char prev_hash[HASH_SIZE];  // 上一个区块的 hash 值
    char hash[HASH_SIZE];       // 当前区块的 hash 值
    struct Block* next;         // 下一个区块的指针
} Block;

// 生成 hash 值的函数
char* generate_hash(char* data) {
    char* hash = (char*)malloc(sizeof(char) * HASH_SIZE);
    // 实现 hash 算法
    // ...
    return hash;
}

int main() {
    Block* head = (Block*)malloc(sizeof(Block));
    head->index = 0;
    head->timestamp = time(0);
    strcpy(head->data, "This is the first block.");
    memset(head->prev_hash, 0, HASH_SIZE);
    strcpy(head->hash, generate_hash(head->data));
    head->next = NULL;

    Block* curr = head;

    // 添加新的区块
    Block* new_block = (Block*)malloc(sizeof(Block));
    new_block->index = curr->index + 1;
    new_block->timestamp = time(0);
    strcpy(new_block->data, "This is the second block.");
    strcpy(new_block->prev_hash, curr->hash);
    strcpy(new_block->hash, generate_hash(new_block->data));
    curr->next = new_block;
    curr = new_block;

    // 输出区块链的内容
    curr = head;
    while (curr != NULL) {
        printf("Index: %d\n", curr->index);
        printf("Timestamp: %ld\n", curr->timestamp);
        printf("Data: %s\n", curr->data);
        printf("Prev Hash: %s\n", curr->prev_hash);
        printf("Hash: %s\n", curr->hash);
        curr = curr->next;
    }

    // 释放内存
    curr = head;
    while (curr != NULL) {
        Block* temp = curr;
        curr = curr->next;
        free(temp);
    }

    return 0;
}

以上代码实现了一个基本的区块链，包含了区块链的索引、时间戳、数据、上一个区块的 hash 值和当前区块的 hash 值，通过链接不同的区块形成区块链。