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1、C函数、数组、指针和调试器gdb—数组Tothisend,thebasicdatatypes(integer,character,floatingpoint,etc.)areintroduced,andtheClanguagealsoprovides3compositedatatypes:arrays,structures,andshares・Complexstructuredatatypesareconstructedfromthebasicdata,typeinaccordancewithcertainrule
2、s・1,thedefinitionanduseofone-dimensionalarrayAnarrayisacompositedatatypeconsistingoftypenames,identifiers,anddimensions・Thetypenamespecifiesthetypeofelementthatisstoredinthearray,andthedimensionspecifiesthenumberofelementscontainedinthearray.Identifiersareused
3、toidentifythearray.Thegeneralformofarraydefinitionis:Datatypeidentifier[numberofelements.Forexample,thefollowingdefinesanarraycontaining10integerelements:Inta[10]:Thetypeofanarrayelementcanbeeitherabasetypeoracompositedatatype.Thenamingruleofanidentifieristhes
4、ameasthatofagenericvariablename・Thenumberofelementsspecifiesthenumberofelementsinanarray.Itmustbeaconstantexpression.Thearraydefinedbelowisillegal:Intn二10;Inta[n];Nisavariable,notaconstantorconstantexpression.Thearray,likethevariable,isdefinedfirstandthenused・
5、TheClanguagespecifiesthatonlyoneelementofthearraycanbereferenced,andthattheentirearraycannotbereferencedatatime:Identifier[index]Forexample,the10elementsofthearraya[10]area[0],1[1],a[2],a[3],a[4],a[5],,a[6],a[7],a⑻,a[9_.A[0]二10;Assign10tothefirstelementofanarr
6、ay.Youcaninitializeanarraywhendefiningit,forexample:Inta[10]={9,8,7,6,5,4,3,2,1,0}:Thena[0]isgiveninitialvalue9,a[l]is8,andsoon.Youcanspecifyinitialvaluesforsomeelementsofanarray,forexample:A[10]二{9,8};A[0],a[l]isgiventheinitialvalueof9,8,andtheremainingelemen
7、tsareautomaticallygiventheinitialvalueof0.Ifanarrayisdefined,allitselementsareinitializedwithoutspecifyingthenumberofelements,suchasanarraycontaining10integerelementsasdefinedbelow.Inta[]二{9,&7,6,5,4,3,2,1,0};Note:allarrayelementsdefinedinallthefunctionwillaut
8、omaticallybegivenaninitialvalueof0,inthearraydefinitionofinternalfunction,systemwillnotbeinitializedinthemustinitializetheelementsofthearrayelementsbefore・1,thedefinitionanduseoftw
