How do I perform a circular rotation of a byte?

Question

I\'m trying to implement a function that performs a circular rotation of a byte to the left and to the right.

I wrote the same code for both operations. For example,

Answer 1

If, as according to your comments, you want to shift one bit exactly, then one easy way to accomplish that would be this:

unsigned char rotl(unsigned char c)
{
    return((c << 1) | (c >> 7));
}

What your code does is reversing the bits; not rotating them. For instance, it would make 10111001 into 10011101, not 01110011.