How to turn off some bits while ignoring others using only bitwise operators

Question

I\'ve searched for this, but my results were unsatisfactory, probably because of how hard it is to word. I have one object, state, which is a byte that

Answer 1

If you just invert the bits of the parts, you can just AND it with the state

 void disableParts(byte parts) {
     byte invertOfParts = 0b11111111 - parts;
     state &= invertOfParts
 }

Answer 2

What you need to do is invert the bits (bit-wise NOT) in partsToDisable so you end up with a mask where the 1's are the bits to be left alone and the 0's are the bits to be turned off. Then AND this mask with the state value.

public void disableParts( byte partsToDisable)
{
    state = state & (~partsToDisable);
}