c语言题库判断河南工业大学 河工大 c语言期末考试题库C language question文档格式.docx

c语言题库判断河南工业大学 河工大 c语言期末考试题库C language question文档格式.docx

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day,sum,and_pint

Ifcharcisdefined,thenc="

C"

"

;

TheClanguagecanuseasymbolicnametorepresentaconstant

Thefollowingproceduressegmentfloatx=3.6;

inti;

i=（int）x;

thenx=3,i=3

IntheClanguage,characterdatacanbearithmeticoperationswithintegerdata

Theaccuracycanbespecifiedwhenusingscanftoenterdata

InC（+,-）operatorcanonlybeusedforvariable

Thefloata=b=c=1.0iscorrectintheClanguage

Inputchar（c）,Ccanbeanescapecharacter

~~~4

Theifstatement,whetherwrittenonafewlines,isawholeandbelongstothesamestatement.

Theentireifstatementcanbewrittenonmultiplelinesorwrittenonasingleline.

Intheifstatement,ifmusthaveelse.

Intheifstatement,elsemusthaveif.

Theelseclausecannotbeusedaloneasastatement,andmustbepairedwithif.

IntheClanguagecompilingsystem,whentheresultoflogicaloperationsisexpressed,thevalue"

1"

standsfor"

truth"

and"

0"

means"

false"

.

Arithmeticoperatorshaveprecedenceoverrelationaloperators.

Logicisnotthehighestpriorityinlogicaloperators.

Theswitchstatementisamultibranchselectionstatement.

Injudgingwhetheraquantityistrue,0represents"

true"

~~~5

IntheClanguage,3statementsthatimplementtheloopstructurearetheforstatement,thewhilestatement,andtheDO-WHILEstatement.

For（（.））andwhile

（1）areinfiniteloops.

InC,thewhilestatementsthatimplementloopstructuresareexactlyequivalenttotheDO-WHILEstatements.

Theexecutionstatementfor（i=1;

i++<

4;

）;

thevalueofthelattervariableIis4

Theforstatementcanonlybeusedincaseswherethenumberofcycleshasbeendetermined.

Theexistingdefinitionofintk=1;

executesthestatementwhile（++k<

4）;

then,thevalueofKis4

~y.

#include<

stdio.h>

int（main）programj=10,i=0{int,k=2,s=0;

for（;

）{i+=k;

if（i>

j）{printf（%d,s）;

break;

}s+=i;

}},judgei>

jcarriedout6.

Ints=36;

while（s）--s;

constitutesadeadloop.

Programsegmentint=0;

while（t=1）{printf（"

%d\n"

"

t"

}atruntime,theprintfstatementexecutes0times.

Program#include,<

int,main（）,{int,x=23;

.Do{printf（"

%d"

x--"

"

while"

（"

X"

}theoutputoftheruntimeis23

~~~6

Whendefininganarray,anarraysubscriptcanberepresentedbyavariable

Whenreferencingelementsinanarray,thearraysubscriptcanberepresentedbyavariable

Inta[8];

definesanintegerarray;

thelastelementinthearrayisa[8]

Inta[6];

thefirstelementinthearrayisa[1]

Inta[2][3];

definesanarrayinwhichthereare6elementsinthearray

Supposethats[10]isanarrayofcharacters,byscanf（"

s"

youcanenterastringtothearray

Inta[6]={0};

definesanarraya,andtheinitialvalueofeachelementinthearrayis0

Int,a[2][3]={{1},{2},{3}};

thecorrectmethodofinitialvaluesforanarray

Comparethesizeoftwostrings,andyoucanusethestrcpyfunction

Toconnecttwostrings,youcanusethestrcatfunction

Totestthelengthofastring,youcanusethestrlenfunction

~~~7

Ifthedefinitionofthecallfunctionappearsbeforethemainfunction,youdonothavetodeclareit.

TheClanguagecannotdefinefunctionsnested,norcannestedfunctionsbecalled.Thatistosay,nofunctioncanbecalledintheprocessofinvokingafunction

Thevariablesdefinedintheprimaryfunctionarealsovalidonlyintheprimaryfunction,notintheentirefileorprogrambecausetheyaredefinedinthemainfunction.Themainfunctioncannotusevariablesdefinedinotherfunctions.

Variablesindifferentfunctionscanusethesamename.Theyrepresentdifferentobjectsanddonotinterferewitheachother.

Withinafunction,variablescanbedefinedincompoundstatements,whicharevalidonlyinthecompoundstatement,whichisalsocalledasubprogramorablockofprograms"

Thevariablesdefinedinafunctionareexternalvariables,andvariablesdefinedoutsidethefunctionarecalledlocalvariables,andtheexternalvariablesareglobalvariables（alsoknownaswholevariables）.

Localvariablescanbesharedbyotherfunctionsinthisdocument.Itsrangeofvaliditystartsfromthelocationofthedefinedvariabletotheendofthesourcefile.

Itcanbedividedintostaticstoragemodeanddynamicstoragemodefromthepointofviewoftheexistenceofvariablevalue.

Theso-calleddynamicstoragemeanswhentheprogramisrunning,thesystemallocatesafixedstoragespace.

Staticstorageisthewaytodynamicallyallocatestoragespaceasneededduringprogramexecution.

InC,ifapointervariableisusedtocallanargument,thepointervariableisdetermined,pointingtoadefinedcell.

IntheClanguage,thecallofafunctioncanonlygetareturnvalue,andthepointercanbeusedasafunctionparametertoobtainmultiplevalues.

InClanguage,inputandoutputstatementsareusedtoinputandoutputdata.

Whenusingtheputcharfunction,youmustincludetheheaderfilestdio.hbefore.

Usingtheputcharfunction,youcanoutputastringtotheterminal.

Usingtheprintffunction,youcanoutputbyacertainnumberofdigits.

Intheprintffunction,both%cand%scanoutputstrings.

Whenyouenterdataintoadefinedvariablewiththescanffunction,youmustadd&

Whendataisenteredintoadefinedvariableusingthescanffunction,thedatainputendswhenanillegalinputisentered.

Theuseofinputandoutputfunctions,putchar（getchar（））,statementsarewrong（correct）.

~~~8

Thepointertothearrayelementistheaddressoftheindexgroupelement.

TheprogramforexchangingtwopointervariablesP1andP2istemp=*p1;

*p1=*p2;

*p2=temp;

Printf（"

a[i]"

）playsthesameroleasprintf（"

*"

（a+i））,andtheformerisefficient.

Thearraynameoftheparameterisnotanationaladdress,butishandledbypointervariables.

Thepointertothefunctionthatdefinestheformatisint*p（int,int）;

Theprogramsegmentsint,*p,a=2;

p=&

a;

printf（"

*（p++））;

theoutputis2

InC99,youcandefinepointervariablesofthebasetypeofvoid,whichcanpointtoanytypeofvariable.

TheprogramsegmentthatpointsPtothestring"

China"

ischar*p;

p="

Programsegmentsareint,a,m=4,n=6,*p1=&

m,*p2=&

n,a=（*p1）/（*p2）+5;

afterexecution,thevalueofais5

Voidf（int*n）{while（（*n）-（printf）;

++（*n））;

}（main）{inta=1;

f（&

a）;

}nooutput

~~~9

TheClanguageallowsuserstobuildtheirowncompositedatastructurescomposedofdifferenttypesofdata,calledstructures.

Thenameofthestructtypeisthenameofthestruct.

Whendefiningastruct,thetypeofamembermustbespecified,eitherasasimpledatatypeorasaconstructeddatatype.

Iftheprogramcontainsthestructtype,thenameofthestructmembercannotbethesameasthevariablenameintheprogram.

Membersofstructuralvariablescanperformvariousoperationsjustlikenormalvariables.

Eachelementofanarrayinanarrayofstructuresisofthesametype,andcanperforminputandoutputoperationsoneacharrayelementasawhole.

~~~10

Thefileidentifiercontainsthreeparts,

Filepath,filename,trunk,andfilesuffix.Thenamingruleofafilenamefollowsthenamingruleofanidentifier.Thesuffixisusedtorepresentthenatureofafile,consistingof3letters.

Accordingtotheorganizationofdata,datafilesaredividedintoASC||files（textfiles）andbinaryfiles（imagefiles）,andASC||filessavestoragespacethanbinaryfiles.

Inthebufferfilesystem,eachusingthefilehasacorrespondingfileinformationinmemory,andthefileassociatedwiththefilepointertothefileinformationandita