加法器是产生数的和的装置。加数和被加数为输入，和数与进位为输出的装置为半加器。若加数、被加数与低位的进位数为输入，而和数与进位为输出则为全加器。-Adder is generated and the number of devices. Addend and the summand input, and digital and carry the output device is a half adder. If the addend, the progress of summand bits with low input, and several carry the output compared with the full adder.