宏实现奇数偶数位交换及offsetof

森明帮大于黑虎帮发布时间：2021-07-17 16:47:28 ，浏览量：3

文章目录

一、宏实现奇偶数交换
二、宏实现构体中某变量相对于首地址的偏移

一、宏实现奇偶数交换

在这里插入图片描述如上图所示：用X先按位与（01010101010101010101010101010101）就是55555555得到二进制数偶数位全部为0然后左移一位偶数位全部变成奇数位，且得到的二进制奇数位为0。如上图所示，同理如上图所示：用X先按位与(10101010101010101010101010101010)就是aaaaaaaa得到二进制数奇数位全部为0然后右移一位奇数位全部变成偶数位，且得到的二进制偶数位为0。两者在按位或那么就得到了交换的奇数偶数位

#define SWAP(i)   ((((i)&0x55555555)


    
        



        
        
            
                
                
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