128 in Binary
Decimal 128 equals 10000000 in binary.
Why this number matters: 128 is 2⁷ - the sign bit of an 8-bit integer. As a signed byte it wraps around to -128.
128 in all number bases
Decimal128
Hexadecimal0x80
Binary1000 0000
Octal200
How 128 converts from decimal to binary
Divide by 2 repeatedly and keep each remainder, then read the remainders from bottom to top:
128÷ 2 =64remainder0
64÷ 2 =32remainder0
32÷ 2 =16remainder0
16÷ 2 =8remainder0
8÷ 2 =4remainder0
4÷ 2 =2remainder0
2÷ 2 =1remainder0
1÷ 2 =0remainder1
Result (remainders bottom to top): 10000000