An elementary electronic circuit in the arithmetic logic unit (ALU) that adds one bit to another. The output is the result bit and the carry bit. Just like 9 + 1 derives 0 with a carry of 1, in binary, 1 + 1 yields the same results. See
binary and
ALU.
INPUTS OUTPUTS
Bit Bit Result Carry
1 2 Bit Bit
0 + 0 = 0 0
0 + 1 = 1 0
1 + 0 = 1 0
1 + 1 = 0 1