What Is a Computer? ● Computer O Performs computations and makes logical decisions O Millions /billions times faster than human beings ● Computer programs O Sets of instructions for which computer processes data ● Hardware O Physical devices of computer system Software O Programs that run on computers Liang, Introduction to Java Programming, revised by Dai-kaiyuLiang, Introduction to Java Programming,revised by Dai-kaiyu 3 What Is a Computer? lComputer ¡Performs computations and makes logical decisions ¡Millions / billions times faster than human beings lComputer programs ¡Sets of instructions for which computer processes data lHardware ¡Physical devices of computer system lSoftware ¡Programs that run on computers