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。-The number of adder is produced and device. Addend and BeiJiaShu as input, and the device for output with binary for half a gal device. If BeiJiaShu and low addends, into digits