位运算之交换高位低位

最新推荐文章于 2024-06-05 10:15:16 发布

原创最新推荐文章于 2024-06-05 10:15:16 发布 · 4.6k 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#system

C/C++ 专栏收录该内容

41 篇文章

订阅专栏

本文介绍了一种使用位操作来实现16位和32位整数字节序交换的方法，并通过示例展示了如何在C++中进行具体实现。通过对原始数据的高低字节进行重新排列，实现了字节序的转换。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

inline unsigned long fswap_16(unsigned long ul16)
{
return((((unsigned long)(ul16) & 0xff00) >> 8) | (((unsigned long)(ul16) & 0x00ff) << 8));
}

inline unsigned long fswap_32(unsigned long ul32)
{
    unsigned long temp = (((unsigned long)(ul32) & 0xff000000) >> 24) |
                                        (((unsigned long)(ul32) & 0x00ff0000) >> 8) |
                                        (((unsigned long)(ul32) & 0x0000ff00) << 8) |
                                        (((unsigned long)(ul32) & 0x000000ff) << 24);
     return temp;
}

int main()
{
unsigned long ula = 4095;
unsigned long ulb = 65535;

cout<<endl<<"data ula is : "<<ula;
cout<<endl<<"data ulb is : "<<ulb;

int ret1 = fswap_16(ula);
int ret2 = fswap_32(ulb);

    cout<<endl<<"swapped ula is : "<<ret1;
    cout<<endl<<"swapped ulb is : "<<ret2;
    cout<<endl;

system("pause");

return 0;
}