what is half adder
Half adder is the simplest of all adder circuit, but it has a major disadvantage. The half adder can add only two input bits (A and B) and has nothing to do with the carry if there is any in the input. So if the input to a half adder have a carry, then it will be neglected it and adds only the A and B bits. That means the binary addition process is not complete and thatâs why it is called a half adder. The truth table, schematic representation and XOR//AND realization of a half adder are shown in the figure below.