Low Level Bit Hacks You Absolutely Must Know - good coders code, great reuse

Check if the integer is even or odd.
if ((x & 1) == 0) {
  x is even
}
else {
  x is odd
}
Bit Hack #2. Test if the n-th bit is set.
if (x & (1<<n)) {
  n-th bit is set
}
else {
  n-th bit is not set
}

Bit Hack #3. Set the n-th bit.
y = x | (1<<n)

Bit Hack #4. Unset the n-th bit.
y = x & ~(1<<n)

Bit Hack #5. Toggle the n-th bit.
y = x ^ (1<<n)

Bit Hack #6. Turn off the rightmost 1-bit.
y = x & (x-1)

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