1. Three main types of data: number, text and graphics
2.1 Idea of Stored Data
Data is a collection of raw facts which may be represented by numbers, text, graphics, etc.
They become meaningful after being processed.
The processed data is called information.
Graphics
Text
Number
Stephen Hawking
Three main types of data: number, text and graphics

2. 2.1 Idea of Stored Data
We have to deal with a lot of data everyday, for example, date of birth, weight, height and telephone numbers.
To use data repeatedly, we need to store it.
By memory
By handwriting
By computer storage
Three ways of storing data

3. 2.1 Idea of Stored Data A shopping checklist can be stored, e.g.:
on paper
in a PDA
The checklists are examples of stored data.
Data can be managed and reused more efficiently if it is organized and stored appropriately.
Kevin write down his shopping checklist on a paper.
Susan uses a PDA to write down
the shopping checklist.
Examples of stored data in our daily lives

4. 2.1 Idea of Stored Data A shopping checklist can be stored, e.g.:
on paper
in a PDA
The checklists are examples of stored data.
Data can be managed and reused more efficiently if it is organized and stored appropriately.
Kevin write down his shopping checklist on a paper.
Susan uses a PDA to write down
the shopping checklist.
Examples of stored data in our daily lives

5. 2.2 Idea of Stored Program
A program consists of a series of commands, which can instruct the computers to perform a specific tasks.
Computer operate according to the order of the commands.
It is important to write the commands in a correct order. Otherwise, the computers cannot perform the specific task successfully.

6. 2.2 Idea of Stored Program
Stored programs are used to perform certain specific or repeated tasks, e.g.
preset programs stored in video recorders and washing machines
With stored programs, computers can perform tasks automatically and repeatedly.
Computers can relieve us of tedious tasks such as calculation and machine control.
Use a remote control to set the recording schedule

7. 2.2 Idea of Stored Program
Stored programs are used to perform certain specific or repeated tasks, e.g.
preset programs stored in video recorders and washing machines
With stored programs, computers can perform tasks automatically and repeatedly.
Computers can relieve us of tedious tasks such as calculation and machine control.
Use a remote control to set the recording schedule

8. 2.3 Storage Device another type of computer hardware
used for storing data and programs
Input device
Central processing unit
Output device
Hard disk
Floppy disk
CD-ROM
USB flash disk
SD card
CompactFlash card
Memory Stick
Storage devices
The relationship among input devices, central processing unit, output devices and storage devices

9. 2.3 Storage Device another type of computer hardware
used for storing data and programs
Input device
Central processing unit
Output device
Hard disk
Floppy disk
CD-ROM
USB flash disk
SD card
CompactFlash card
Memory Stick
Storage devices
The relationship among input devices, central processing unit, output devices and storage devices