How it works
Reading what you type
The number is read in the base you pick, unless it starts with a prefix: 0x for hexadecimal, 0b for binary, 0o for octal. In hexadecimal, 0b is read as the digits B, so 0b12 means 0xB12. Spaces, underscores and apostrophes between digits are ignored, so 1_000_000 and 1'000'000 both work.
Values are held as exact big integers, from 0 up to 18,446,744,073,709,551,615 (the largest unsigned 64-bit number), so nothing is rounded the way a calculator rounds past 2^53.
value = Σ digitᵢ × baseⁱ
Words and bits
The register draws the number as a word of 8, 16, 32 or 64 bits, one byte per block with its two hex digits above and its bit numbers below. Click any bit to flip it; the number updates in every base. Word sizes too small for the value are switched off.
When the top bit of the word is set, the value is also shown as a signed number in two’s complement, the way a signed integer of that width would read it.
signed = value − 2ʷ when bit w−1 is 1
Bitwise operations
Turn on Bitwise to combine A with B using AND, OR or XOR, invert A with NOT, or shift it left or right. Results are cut to the word size, so NOT 0 in an 8-bit word is 255 and shifting 0x80 left by one in 8 bits gives 0.
