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：/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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