Low Level Language vs. High Level Language

1
???????????????

• ??????????????????????? ???????? ???
  ??????????????????????????????????????????????????
  ?????????????????????????
• ??????????????????? ??? ??????????????????????
• ?????????????
• Low Level Language vs. High Level
  Language
• ??????????
• 1st , 2nd , 3rd, 4th Generation Language
• ?????????????????????????????????????????????
  ???????????

2
Machine Language (???????????)

• ????????????????????????????????????????(Lowest
  Level Language)
• ????????????????????????????????????????
  ???????????????????(??? 2) ???????
• ??????????????????????? Processor ??????? CPU
  ?????????????????????????????????????????

3
Assembly Language

• ????????????????? Machine Language
  ??????????????????????????? (Low Level Language)
• ???????????? mnemonics ??? symbolic addressing
  ??????????????????????????????????????????????????
  ????????? ????
• mov ax,0a000h
• int 10h
• out dx,al
• ??? Assembler ???? Assembly Program ????
  Machine Language

4
High Level Language

• ?????????????????????????? ???? ?????????? ?????,
  ?????, ??????????, ??????????, ????????????
  ????????????????????
• ?????????????????????????? ???????????
• ??????????????????????????????????????????????????
  ????????????
• Compiler ??? ???? Source Program ????
  Object Program ???? ??????????????????????????
  link objrct file ???? ? ????????????????
  ????????????????????????? Executable File
• Interpreter ??? ??? ?????? ???
  ????????????????????????

5
High Level Language

• BASIC (Beginners All-purpose Symbolic
  Instruction Code)
• Quick BASIC ???? QBASIC
• Visual BASIC
• ????????????? Object Oriented Programming
• ?? Tools ????????????????????????????????????
• ???? GUI ( Graphical User Interface)
• Pascal (????? ??????? Blaise Pascal -
  Mathmetician)
• ?????????????????????????????? (Structured
  Program)
• Turbo Pascal ???? version ?????? Object-Oriented
  concept

6
High Level Language

• FORTRAN (FORmula TRANslator)
• ?????????? High Level Language ?????? ?
  ?????????????????
• ??????????????????????????????????????
• ????????????????????????????????????????????
  ???????????
• COBOL (COmmon Business Oriented Language )
• ???????????????????????????????????
  ?????????????????? ?
• ????????????????????????
• ??????????????????????????????????? ????????????
  ????
• perform ... 10 times
• subtract taxes from pay giving income

7
High Level Language

• C
• ??????????????????? B (BCPL)
• ????????????????????????????????????????? System
  Software
• ???? general purpose language ???????????????? PC
• ???????????? UNIX Operating System
• ?????????????????????????????? C
  ??????????????????????????????????????????????????
  ????? !
• C ( C plus plus)
• ????????????????? C ?????? Object-Oriented
• ??????????????????? Application Software

8
High Level Language

• Java
• an object-oriented language similar to C, but
  simplified to eliminate language features that
  cause common programming errors. Java is a
  general purpose programming language with a
  number of features that make the language well
  suited for use on the World Wide Web

9
??????????????????????????????

• ?????????????????????????????????????????
• ???????????????????????????????????????????
  ??????? ?????
• ??????????????????????????????????????????????????
  
• ???????????????? ??????????? ?????????????????????
  ???????
• ??????????????????????????????????????????????????
  ?? ????

10
Object Oriented Programming(OOP)

• ???????????????????????????????????????
• ?????????????????????????????????????????
  ?????????????? ???????????????????????????????????
  ??(Object) ????? ?????????????????????????(Proce
  dure) ?????
• ?????????????????????????????? Module ?????
  ?????????????????????????????????????
  ????????????