How to perform a right bit rotation in C#?

Question

.NET

Hello! I am writing a program in C#. There is a number that takes values ​​from 0 to 255 (type - Byte; 8 bits), in which you need to perform a cyclic bit shift to the right. Accordingly, after the shift, you should get a number from 0 to 255.
I found this code:

int shr(int a, int s) {
  return (a>>s) | (a<<32-s);
}

But it works in a strange way - it turns out numbers that are much larger than 255. Tell me how to implement this? Thanks in advance.

Answer 1

a = (a>>s) | ((a<<(8-s)) & 255)

Answer 2

Well of course they WILL exceed 255! First, the parameters and return value are int, and you need char. Secondly, the data length is explicitly specified as 32 bits.

Answer 3

((a*257)>>s)&255.
It will work faster, for some reason, logical operations in C # are very expensive compared to multiplication.