C语言实现循环左移和右移

一、win下stdlib.h中的循环移位函数

unsigned int _rotl(
   unsigned int value,
   int shift
);
unsigned __int64 _rotl64(
   unsigned __int64 value,
   int shift
);
unsigned int _rotr(
   unsigned int value,
   int shift
);
unsigned __int64 _rotr64(
   unsigned __int64 value,
   int shift
);

微软帮助文档：https://www.baidu.com/link?url=vcaoeKfMNevowWj1d485LtW-iVZdaJtVdrLRyzwBP3OJFRKmIyZKMSUI19vJhHhpbq9pHmhiX42hXTu3Vc0Lc3qlWEbQSeiAimwO9Niz1Nb3Ej6ffw5HBAC443Wo3dX1pRUMxiURPHESttP7koKCaq&wd=&eqid=f5c336ef0000c801000000065f917ffd

二、KeilC51单片机C语言库intrins.h中的循环移位函数

unsigned char _cror_(unsigned char ,unsigned char );
unsigned int _iror_(unsigned int ,unsigned char );
unsigned long _lror_(unsigned long ,unsigned char );

unsigned char _crol_(unsigned char ,unsigned char );
unsigned int _irol_(unsigned int ,unsigned char );
unsigned long _lrol_(unsigned long ,unsigned char );

三、使用宏实现循环移位函数

// value循环左移bits位
#define rol(value, bits) ((value << bits) | (value >> (sizeof(value)*8 - bits)))

// value循环右移bits位
#define ror(value, bits) ((value >> bits) | (value << (sizeof(value)*8 - bits)))

main.cpp测试代码

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    int value = 0x01;
    int rst1 = rol(value, 1);
    int rst2 = rol(value, 31);
    int rst3 = rol(value, 33);
    printf("0x%x, 0x%x, 0x%x\n", rst1, rst2, rst3);

    unsigned int temp = 0x80000000;
    unsigned int rst4 = ror(temp, 1);
    unsigned int rst5 = ror(temp, 31);
    unsigned int rst6 = ror(temp, 33);
    printf("0x%x, 0x%x, 0x%x\n", rst4, rst5, rst6);

    return a.exec();
}

运行结果：

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