C语言英文课件Chapter.ppt

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1、chapter10STRUCTURESANDUNIONSAstructureisacollectionofoneormorevariables,possiblyofdifferenttypes,whicharetreatedasaunitinsteadofasseparateentities.10.1structuredefinition10.2structurevariablescitingandinitialization10.3structurearray10.4structurepointe

2、r10.5linkdispoing---applicationofstructurepointer10.6unionandenumeration10.7typedef10.1STRUCTURETYPEANDDECLARATIONOFSTRUCTUREVARIABLESTHESTRUCTURETYPE,INCLANGUAGE，isthecounterpartas“record”inotheradvancedlanguage.一、questionemergingSTUDENTSCORESMANAGETA

3、BLECANOTDEALWITH2DARRAYSDIFFERENTTYEPES！1001ZhangXinM2087911002WangLiF2098961003ChenFongM2186901004LiXiaopenM207786numnamesexagescore1score2二、structuretypedeclarationCommonusage：structstructuretypename{datatypemember1;datatypemember2;…………datatypemembe

4、rn;};structstudent{intnum;charname[20];charsex;intage;floatscore1;floatscore2;};Typenamenumnamesexagescore1score2structstudentdemonstration：1、therulestoname“structuretypename”and“membername”,aresamewiththevariables’.2、thedefinitionsofvariablescanbesepe

5、ratedorinasamelineliketheinstancebeloweg.structdate{intyear,month,day;};3、thedefinitionsofvariablescouldbebasictypesoranotherstructuretypewhichhasbeendeclarated.eg.thetype”birthday”intheeg.Ofstructuretypestd_infoisadefinitedstructuretype--date三、STRUCTU

6、REVARIABLESDECLARATIONStructuretype（userdefinition）Standarttype（systemdefinition）1、indirectdeclaration──firstdeclarethestructuretype,thenthestructurevariablesThesameusagestructstudent{intnum;charname[20];charsex;intage;floatscore1;floatscore2;};structs

7、tudentstu1,stu2;numnamesexagescore1score2stu12、directdeclaration(1)definitethestructurevariable,whendefinitingthestructuretype；(2)definitethestructurevariabledirectly；(1)structstudent{intnum;charname[20];……floatscore2;}stu1,stu2;(2)struct{intnum;charna

8、me[20];……floatscore2;}stu1,stu2;3、demonstration(1)differstructuretypeandvariable,whicharecompletelydifferentconception,justastypeintandvariableofint(2)membernamesinstructure,maybesameasothervariablesinprogram,standfordifferentobjects[eg