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

byte THIRDBIT = 4; // 4 = 00000100 i.e third bit is set

int isThirdBitSet(byte in) {
 return in & THIRDBIT; // Returns 1 if the third bit is set, 0 otherwise
}