用C语言实现循环左移，右移

C51中实现循环左移、右移的库函数：

1. #include<intrins.h>
2. unsigned char _crol_(
3. unsigned char c, /*charactertorotateleft*/
4. unsigned char b); /*bitpositionstorotate*/
6. unsigned char _cror_(unsigned char ,unsigned char );
7. unsigned int _iror_(unsigned int ,unsigned char );
8. unsigned long _lror_(unsigned long ,unsigned char );
9. unsigned char _crol_(unsigned char ,unsigned char );
10. unsigned int _irol_(unsigned int ,unsigned char );
11. unsigned long _lrol_(unsigned long ,unsigned char )

自己实现同样的功能：

1. unsigned char crol(unsigned char c,unsignedb)
2. {
3. unsigned char left=c<<b;
4. unsigned char right=c>>( sizeof (unsigned char )-b)
5. unsigned char temp=left|right;
6. return temp;
7. }

1. unsigned char cror(unsigned char c,unsignedb)
2. {
3. unsigned char right =c>>b;
4. unsigned char left =c<<( sizeof (unsigned char )-b)
5. unsigned char temp=left|right;
6. return temp;
7. }