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C++object-orientedquestionsZZshury发表于2004-12-517:40:00Q.Whatispurevirtualfunction?Aclassismadeabstractbydeclaringoneormoreofitsvirtualfunctionstobepure.Apurevirtualfunctionisonewithaninitializerof=0initsdeclarationQ.WriteaStructTimewhereintegerm,h,sareitsmembersstructTime{intm;inth;ints;};howdoyoutraverseaBtreeinBackwardin-order?ProcessthenodeintherightsubtreeProcesstherootProcessthenodeintheleftsubtreeQ.WhatisthetwomainrolesofOperatingSystem?AsaresourcemanagerAsavirtualmachineQ.Inthederivedclass,whichdatamemberofthebaseclassarevisible?Inthepublicandprotectedsections.Whatisamodifier?Amodifier,alsocalledamodifyingfunctionisamemberfunctionthatchangesthevalueofatleastonedatamember.Inotherwords,anoperationthatmodifiesthestateofanobject.Modifiersarealsoknownas‘mutators’.Example:Thefunctionmodisamodifierinthefollowingcodesnippet:classtest{intx,y;public:test(){x=0;y=0;}voidmod(){x=10;y=15;}};Whatisanaccessor?Anaccessorisaclassoperationthatdoesnotmodifythestateofanobject.TheaccessorfunctionsneedtobedeclaredasconstoperationsDifferentiatebetweenatemplateclassandclasstemplate.Templateclass:Agenericdefinitionoraparameterizedclassnotinstantiateduntiltheclientprovidestheneededinformation.It’sjargonforplaintemplates.Classtemplate:Aclasstemplatespecifieshowindividualclassescanbeconstructedmuchlikethewayaclassspecifieshowindividualobjectscanbeconstructed.It’sjargonforplainclasses.Whendoesanameclashoccur?Anameclashoccurswhenanameisdefinedinmorethanoneplace.Forexample.,twodifferentclasslibrariescouldgivetwodifferentclassesthesamename.Ifyoutrytousemanyclasslibrariesatthesametime,thereisafairchancethatyouwillbeunabletocompileorlinktheprogrambecauseofnameclashes.Definenamespace.ItisafeatureinC++tominimizenamecollisionsintheglobalnamespace.Thisnamespacekeywordassignsadistinctnametoalibrarythatallowsotherlibrariestousethesameidentifiernameswithoutcreatinganynamecollisions.Furthermore,thecompilerusesthenamespacesignatu
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