The computer is regarded as a hierarchy of levels , each one performing some well - defined functions from the device level ( hardware ) to the problem - oriented language level 計(jì)算機(jī)被認(rèn)為是分成對(duì)個(gè)層次,每個(gè)層次執(zhí)行某些嚴(yán)格定義的功能,這些功能從設(shè)備級(jí)(硬件)到面向問(wèn)題的語(yǔ)言層次。