Briefly describe the composition and working principle of computer system

Computer system includes hardware and software.

Hardware: Hardware (Hardware) refers to the computer's various visible, tangible physical equipment. Such as: mouse, keyboard, monitor, printer, host and so on.

Software: software (Software) refers to the hardware system running on all kinds of programs, data and related information. Such as: win7, word, Excel, PPT, QQ and WeChat and so on.

The hardware system of a computer consists of five parts: the operator, the controller, the memory, the input device and the output device.

Expanded Information

Computer systems can usually have more than five levels, and programming can be done at each level (level).

From bottom to top, these can be ordered as:

1. Microprogram machine level: microinstructions are executed directly by the hardware

2. Conventional machine level: machine instructions are interpreted using microprograms

3. Operating system level: operational control statements are generally interpreted using machine language programs

4. Assembly language machine level: supported and executed by assembler programs

5, high-level language machine level: supported and executed by a variety of high-level language compilation programs

6, application language machine level: using a variety of problem-oriented application language

Baidu Encyclopedia-Computer Systems