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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