資源描述：
《計(jì)算機(jī)英語(yǔ) 教學(xué)課件 作者 楊蕓 主編 楊 蕾 李連弟 副主編unit6.ppt》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。
1、UnitsixProgrammingLanguageProgrammingLanguageIntroductionProgramminglanguages，incomputerscience，aretheartificiallanguagesusedtowriteasequenceofinstructions（acomputerprogram）thatcanberunbyacomputer.Similartonaturallanguages，suchasEnglish，programminglanguageshaveavocabulary，grammar，
2、andsyntax.However，naturallanguagesarenotsuitedforprogrammingcomputersbecausetheyareambiguous，meaningthattheirvocabularyandgrammaticalstructuremaybeinterpretedinmultipleways.Thelanguagesusedtoprogramcomputersmusthavesimplelogicalstructures，andtherulesfortheirgrammar，spelling,andpun
3、ctuationmustbeprecise.Programminglanguagesvarygreatlyintheirsophisticationandintheirdegreeofversatility.Someprogramminglanguagesarewrittentoaddressaparticularkindofcomputingproblemorforuseonaparticularmodelofcomputersystem.Forinstance，programminglanguagessuchasFORTRANandCOBOLwerew
4、rittentosolvecertaingeneraltypesofprogrammingproblems－FORTRANforscientificapplications；andCOBOLforbusinessapplications.Althoughtheselanguagesweredesignedtoaddressspecificcategoriesofcomputerproblems，theyarehighlyportable，meaningthattheymaybeusedtoprogrammanytypesofcomputers.Otherl
5、anguages，suchasmachinelanguages，aredesignedtobeusedbyonespecificmodelofcomputersystem，orevenbyonespecificcomputerincertainresearchapplications.Themostcommonlyusedprogramminglanguagesarehighlyportableandbeusedtoeffectivelysolvediversetypesofcomputingproblems.LanguageslikeC，PASCAL，a
6、ndBASICfallintothiscategory.LanguageTypesProgramminglanguagescanbeclassifiedaseitherlow-levellanguagesorhigh-levellanguages.Low-levelprogramminglanguages，ormachinelanguages，arethemostbasictypeofprogramminglanguagesandcanbeunderstooddirectlybyacomputer.Machinelanguagesdifferdependi
7、ngonthemanufacturerandmodelofcomputer.High-levellanguagesareprogramminglanguagesthatmustfirstbetranslatedintoamachinelanguagebeforetheycanbeunderstoodandprocessedbyacomputer.Examplesofhigh-levellanguagesareC，C++，PASCAL，andFORTRAN.Assemblylanguagesareintermediatelanguagesthatarever
8、yclosetomachinelanguagesanddonoth
