An adder which has, for each digit place, three inputs, one sum output and one carry output and which does not propagate the carry digits by itself within one cycle of operation.; 每個(gè)數(shù)字位均有三個(gè)輸入,一個(gè)和輸出以及一個(gè)進(jìn)位輸出的加法器。這種加法器在一個(gè) 操作周期內(nèi)不傳送進(jìn)位數(shù)字。