Unit3AContents1、Introduction（4problems）2)Arenaturallanguagessuitedforprogrammingcomputers?No,theyarenot.3)Whatisthesimilarityanddifferencebetweennaturallanguageandprogramminglanguage?Theybothhavevocabulary,grammarandsyntax.ambiguous/precise4)Whatarethefeaturesofthemostcommonlyusedprogramminglanguages?Theyarehighlyportable.Theycanbeusedtoeffectivelysolvediversetypesofcomputingproblem.2、LanguageTypesMachineLanguages---asequenceof1sand0sandcomputerscanunderstanddirectly.High-LevelLanguages---relativelysophisticatedstatementsutilizingwordsandsyntaxfromhumanlanguage.AssemblyLanguages---arecomposedwiththeaidofeasy-to-remembercommands.Whatdostatementsdefine?1)Thetypeofdataallowed2)Howdataaretobemanipulated3)ThewaysthatproceduresandfunctionsworkWhatarethepurposesofdatadeclarations?Givenamesandpropertiestovariables.Whatisthepurposeofexpression?Describeaseriesofcomputationstobeperformedonvariables.Whatisthepurposeofmacros?Translatesegmentsofcodethathavebeenwritteninalanguagestructuredefinedbytheprogrammersintostatementsthattheprogramminglanguageunderstands.4、History