Bit manipulation – Nextra

Common use cases

Check odd/even number

boolean odd(int n) {
    return n & 0b1;
}

Half the number

int half(int n) {
    return n >> 1;
}

Double the number

int double(int n) {
    return n << 1;
}

Masking (opens in a new tab)

to 1: Y OR 1 = 1, Y OR 0 = Y
to 0: Y AND 0 = 0, Y AND 1 = Y

Masking bits to 1

OR target bits with 1s
OR unchanged bits with 0s

Masking bits to 0

AND target bits with 0s
AND unchanged bits with 1s

Querying the status of a bit

AND target bits with 1s
AND unwanted bits with 0s

Toggling bit values

XOR target bits with 1s
XOR unchanged bits with 0s

Reference

Maths Reference CSS Flexbox Layout practice