程序语言发展史课件.ppt

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1、HistoryofprogramminglanguagesSincethecomputerhasbeenatotalhowmanyprogramminglanguages?2500+MachinelanguageAssemblyLanguageProcess-orientedhigh-levellanguageObjectorientedhigh-levellanguageThefourthstageThethirdstageThesecondstageThefirststage19461950s1954--19951995—NowFourstagesofdev

2、elopmentChronologyofprogramminglanguagedevelopmentProgramminglanguageDescription:1.Machinelanguage2.AssemblyLanguage3.Process-orientedhigh-levellanguage4.Objectorientedhigh-levellanguage1.themachinelanguageThebinarynumberoftheinstructioncodeset,with01indicates,themachinecanbedirectl

3、yidentified,variousmachineinstructiondifferent.由二进制数组成的指令代码的集合，用01表示，机器能直接识别，各种机器指令系统互不相同。ComputerCoding:CommonASCIIcodeintomachinelanguage计算机编码：常用ASCII码表示成机器语言Perforatedcardsrecorddataonbehalfof01AdvantagesanddisadvantagesofmachinelanguageAdvantagesDisadvantage1.速度快2.占存储空间小3.翻译质量高1.

4、Fastexecution;2.Representingsmallstoragespace;3.Highqualityoftranslation.1.可移植性差2.编译难度大3.直观性差4.错调试困难1.Poorportability2.Compiledifficult3.Intuitivedifference4.Difficulttodebug2.assemblylanguageMnemonicmachineinstructionopcodeinsteadofusingaddresslabelsinsteadofsymbolsornumbersoroperat

5、inginstructionsaddress.用助记符代替机器指令的操作码，用地址符号或标号代替指令或操数的地址。ComputerCoding:Usingmnemonicstoprogramming,butarelow-levellanguagesandmachinelanguage.计算机编码：用助记符来编程，但和机器语言一样都是低级语言MoqiLaietalonbehalfof01recorddatausingmnemonicsAdvantagesanddisadvantagesofassemblylanguageAdvantagesDisadvantage

6、1.执行速度快；2.占存储空间小；3.可读性有所提高。1.Fastexecution;2.Representingsmallstoragespace;3.Improvedreadability.1Asimilarmachinelanguage;2.poorportability;3.withpoorhumanlanguageisalsoverydifferent.1.类似机器语言；2.可移植性差；3.与人类语言还相差很悬殊。3.process-orientedhigh-levellanguageClosetopeopleaccustomedtousingnatu

7、rallanguageandmathematicallanguage.Versatility,canbetransplantedgood.Butcannotbedirectlyexecutedonacomputer,tobeconvertedintomachineinstructioncode.接近人们习惯用的自然语言和数学语言。通用性强，可以移植性好。但是不能直接在计算机上执行，要转换成机器指令代码。CommonLanguage：BASIC、PASCAL、FORTRAN、C、。。。Design:Algorithms+DataStructures=Program

8、s3.high-leve