module1 introduction to computer and programming

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2nd Semester 2004

Module1Module1Introduction to Introduction to

Computer and ProgrammingComputer and Programming

อภิ�รั�กษ์� จั�นทรั�สรั�างAphirak Jansang

aphirak.j@ku.ac.thhttp://www.cpe.ku.ac.th/~aphirak

Computer Engineering DepartmentKasetsart University, Bangkok THAILAND

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1st Semester 2005

Outline

Introduction to Computer How to run program? Programming Languages

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1st Semester 2005

Do you know?

How many computers in THAILANDTHAILAND?

*http://www.nso.go.th/eng/indicators/core_e.htm*http://www.nso.go.th/eng/indicators/core_e.htm

1998 1999 2000 2001 2002

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1st Semester 2005

How can we classify computers?

Personal Computer Desktop Computer Notebook PDA – Personal Digital Assistant

Supercomputer Mainframe High Computation Power

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1st Semester 2005

Computer Components

Input Devices Output Devices Computing & Processing Unit

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1st Semester 2005

CPU

MainMemory

Input Devices

HD

Secondary Memory

Output Devices

Computer Components

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1st Semester 2005

Computer Memory

1.Main Memory 2.Secondary Memory

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1st Semester 2005

1. Main Memory

Can be devided into 2 Categories RAM (Random Access Memory) ROM (Read Only Memory)

Memory Cell -> Byte -> Bit 1 Byte = 8 bits

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1st Semester 2005

2. Secondary Memory

Floppy disk Hard disk CDROM DVDROMEtc…

1 Kbyte = 210 = 1024 bytes1 Mbyte = 220 = 1,048,576 bytes

1 Gbyte = 230 = 1,073,741,824 bytes

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1st Semester 2005

Main Memory VS Secondary Memory

Main MemoryMuch fasterMore

expensiveVolatile

Secondary MemorySlowerLess expensivePermanent

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1st Semester 2005

Do you know ASIMO?

*http://world.honda.com/ASIMO/*http://world.honda.com/ASIMO/

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1st Semester 2005

Outline

Introduction to Computer How to run program? Programming Languages Introduction to Pascal Language

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1st Semester 2005

How to run program? After boot Process

May be Windows XP (Operating System: OS) has been loaded into Main Memory

User tell OS to load program P1 OS Load program P1 from Secondary

Memory into Main Memory OS run program from Main Memory

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1st Semester 2005

Outline

Introduction to Computer How to run program? Programming Languages

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1st Semester 2005

Programming Languages

Machine Language Assembly Language High-Level Language

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1st Semester 2005

High-level VS Assembly VS Machine Language

High-level LanguageSUM := A * 2 + ALPHA/3;

Assembly LanguageMULL3 A, #2, R6

DIVL3 #3, ALPHA, R7ADDL3 R6, R7, SUM

Machine Language0001100001100011001111 10011000111

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1st Semester 2005

High-Level Languages

Procedural Language Fortran Cobol Basic C Pascal

Object-Oriented Language C++ Java C#C#

Functional Language Lisp

Logic Language Prolog

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1st Semester 2005

How to execute program from non-machine language?

Interpretation Method Translation Method

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1st Semester 2005

Interpretation Method Process

InterpreterInterpreter(on computer)(on computer)

OutputSource ProgramSource ProgramSource Program

Input

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1st Semester 2005

Translation Method Process

TranslatorTranslator(on computer)(on computer)

File *.exe

Source ProgramSource ProgramSource Program

Input

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1st Semester 2005

Translators

Assembler (assembly) Compiler (High-level language)

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1st Semester 2005

Quiz1 Quiz1

What will happen What will happen to you when to you when

our world have our world have no computers?no computers?

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1st Semester 2005

Summary

Computer Basic Programming Language

Interpreter Method Translator Method