Brief Notes for HKCEE CS

剛剛在《皆大歡喜》裏，阿日拍的電影叫《王老虎搶親》，爆笑……ｃｃｃ

　　星期一考的是電腦，即使大家不在乎，我也在此簡單地打出一些 Brief Notes。與我同考場的人應該知道每一科我都會寫一頁又頁的 Brief Notes，電腦亦不例外，由於考試局新意欠缺，特別是我們這屆尾班車電腦，估計應該保守出卷。再者比起上次和下次的課程，我們的簡直是短得可怕，要讀的比 Physics 還少，只要掌握模式，要合格應該不難。

Uses of Computer

1. Telecommunications
2. Industrial
3. Embedded System (eg. Television)
4. A.I.
5. Expert sustems
6. Robotics
7. C.A.L. (for learning eg. by simulating)
8. C.A.I. (for teaching)
9. Multimedia

Network topologies

1. Star
   +: Efficient
   -: Rely on central computer


2. Ring
   +: Fast
   -: One noed fails, whole network breaks


3. Bus
   +: Easy to install, Cheap
   -: Slow

Data control

1. Data verification : by retyping, etc
2. Data validation : check whether the data is reasonable, eg. Presence check, Length check, Range check, Type check, Check digit, Control total

Operating modes

1. Batch processing
   eg. Payroll system
   +: Simple, Economical
   -: Outdated information, Wait for long time


2. Real-time processing
   eg. Ticketing system
   +: Up-to-date information, Time saving
   -: Difficult to set up, Expensive


3. Interactive processing
   * Interactive processing needs to be real-time, otherwise it is meaningless (said by Mr.Ng)
   eg. A.T.M.
   +: User-firendly, Easy to operate
   -: Complex


4. Multitasking
   +: Time-saving
   -: One bad slow down all


5. Multi-user
   eg. Video Disk Rental
   +: Maximum uses of resources
   -: Security decreases, Complex, Expensive

Jobs

1. Data-entry operator / clerk : Data input
2. Computer operator : Normal operation of computers
3. Applications programmer : programming for practical usages
4. Systems programmer: programming for operating computer
5. Computer engineer: computer engineering
6. Systems analyst: Analysing problems
7. Network manager: Networking
8. Computer technican: Maintenace
9. Sales executive: sales
10. Technical writer: publishing computer books
11. Computer trainer: teaching

Types of computers

1. Supercomputers: scientific research, weather forecasting
2. Mainframe computers: universities, government
3. Minicomputers: universities
4. Microcomputers (Desktop/Tower or Protable): at home, school

Operating system
Functions:

1. Supervise programs while they are running
2. Communicate with users
3. Provide utilites for management
4. Make good use of resourses
5. Keep a log of actions
6. Maintain security
7. Handle errors

Features:

1. Multitasking
2. Time-sharing
3. SPOOLing

Program design

1. Problem definition
2. Problem analysis
3. Algorithm design
4. Program coding
5. Program testing and debugging
6. Porgram documentation

　　並未全部覆蓋，但以上已漸 M.C. 的二至三十題，餘下的 Excel、Assembly、Data representation、CPU 和 Programming 多練 Past paper 應該可以過關。除非不懂用小畫家和 Word，那我沒話可說 =.=