Reverse bits of a byte.

Solution #1. E.g.

00001001 ==> 10010000

Here is the code,


#define GET(n, x) ((n&(1<<x))>>x)
#define SET(n, x) (n|(1<<x))
#define RESET(n, x) (n&(~(1<<x)))

int reverseBits(unsigned char n)
{
    int temp = n;
    int start = 0;
    int end = 7;

    while(start < end)
    {
        int sbit = GET(n, start); //find start bit
        int ebit = GET(n, end); //find end bit
        
        //set end bit equal to start bit
        temp = sbit?SET(temp, end):RESET(temp, end);
        //set start bit equal to end bit
        temp = ebit?SET(temp, start):RESET(temp, start);

        start++;
        end--;
    }

    return temp;
}