判断数据大小端

FlourishingMind

已于 2023-02-21 09:48:35 修改

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分类专栏： C 文章标签： java c++ 数据结构

于 2023-02-21 09:46:24 首次发布

本文链接：https://blog.youkuaiyun.com/qq_17033619/article/details/129136692

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该代码段用于检查C++环境下的数据存储方式，特别是时间戳`time_ttime1`在内存中的布局。它打印出时间戳在内存中的各个字节地址及其值，并通过比较来判断系统是否采用小端字节序。如果第一个字节最小，说明是小端字节序。

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int main()
{
    using namespace std;
    time_t time1 = 1;
    cout << "看数据大小端" << endl;
    cout << "时间地址1: " << hex << (uint32_t)((uint8_t*)(&time1)) << " 值：" << hex << (uint32_t)(*((uint8_t*)(&time1))) << endl;
    cout << "时间地址2：" << hex << (uint32_t)((uint8_t*)(&time1) + 1) << " 值：" << hex << (uint32_t)(*((uint8_t*)(&time1) + 1)) << endl;
    cout << "时间地址3：" << hex << (uint32_t)((uint8_t*)(&time1) + 2) << " 值：" << hex << (uint32_t)(*((uint8_t*)(&time1) + 2)) << endl;
    cout << "时间地址4：" << hex << (uint32_t)((uint8_t*)(&time1) + 3) << " 值：" << hex << (uint32_t)(*((uint8_t*)(&time1) + 3)) << endl<<endl;
    if (((uint32_t)((uint8_t*)(&time1))) < ((uint32_t)((uint8_t*)(&time1) + 3)))
    {
        if ((uint32_t)(*((uint8_t*)(&time1)))==1)
        {
            cout << "时间地址1: " << hex << (uint32_t)((uint8_t*)(&time1)) << " 值：" << hex << (uint32_t)(*((uint8_t*)(&time1))) << endl;
            cout << "低地址存放低字节" << endl<<endl;
        }
    }
}