2 1 Idea of Stored Data Data is

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2. 1 Idea of Stored Data • Data is a collection of raw facts

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. 299 792 458 Stephen Hawking Number Text Graphics Three main types of data: number, text and graphics

2. 1 Idea of Stored Data • We have to deal with a lot

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

2. 1 Idea of Stored Data • A shopping checklist can be stored, e.

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. Examples of stored data in our daily lives Susan uses a PDA to write down the shopping checklist.

2. 1 Idea of Stored Data • A shopping checklist can be stored, e.

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. Examples of stored data in our daily lives Susan uses a PDA to write down the shopping checklist.

2. 2 Idea of Stored Program • A program consists of a series of

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.

2. 2 Idea of Stored Program • Stored programs are used to perform certain

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

2. 2 Idea of Stored Program • Stored programs are used to perform certain

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

2. 3 Storage Device • another type of computer hardware • used for storing

2. 3 Storage Device • another type of computer hardware • used for storing data and programs Input device Central processing unit Output device Storage devices Compact. Flash card Hard disk USB flash disk Floppy disk SD card Memory Stick CD-ROM The relationship among input devices, central processing unit, output devices and storage devices

2. 3 Storage Device • another type of computer hardware • used for storing

2. 3 Storage Device • another type of computer hardware • used for storing data and programs Input device Central processing unit Output device Storage devices Compact. Flash card Hard disk USB flash disk Floppy disk SD card Memory Stick CD-ROM The relationship among input devices, central processing unit, output devices and storage devices