移位操作之旋转移位

Posted 2020-09-15 clnchanpin

 所谓旋转就是一端的位数移出字长后又插入到还有一端中

unsigned char RoL(unsigned char c,int b)
{
	int tmp;
	for(int i=0;i<b;++i)
	{
	if(c & 0x80)
		{
          tmp=1;
		}
		else
		{
            tmp=0;
		}

		c <<= 1;

		c |= tmp;
	}

	return c;

}

unsigned char RoR(unsigned char c,int b)
{
	int tmp;
	for(int i=0;i<b;++i)
	{
		if(c & 1)
		{
        tmp=1;
		}
		else
		{
			tmp=0;
		}
		c >>= 1;
		c |= (tmp << (sizeof(c)*8-1));
	}
 return c;
}
void  main()
{ 
	unsigned char a=5;


	int b=RoL(a,2);  //10100
	int c=RoR(a,2);  //01000001         00000101
}