How can I check my byte flag, verifying that a specific bit is at 1 or 0?

Question

I use a byte to store some flag like 10101010, and I would like to know how to verify that a specific bit is at 1 or 0.

Answer 1

Nobody's been wrong so far, but to give a method to check an arbitrary bit:

int checkBit( byte in, int bit )
{
  return in & ( 1 << bit );
}

If the function returns non-zero, the bit is set.