Whichofthefollowingis（are）trueregardingexecutionofthesegment?
1.Theinputstatementwillalwaystakethesameamountoftimetoexecute.
2.Theoutputstatementwillalwaysbeexecutedimmediatelyaftertheinputstatement.
3.Ifxandyarebothpositive,anintegergreaterthanbothwillbeprinted.
a.IIandIIIonly
b.IandIIonly
c.none
d.IIonly
5.Integratedprogrammingenvironmentsmakeitdifficulttomixandmatchtoolsfromdifferentsources.Thisis（b）
a.good,becausetoolsfromdifferentsourcescannotbemadetointeractwitheachother
b.bad,becausenosinglevendorislikelytobethesourceofallthebesttools
c.bad,becauseallthetoolswillthenhavethesameuserinterface
d.good,becauseitensurescompilationisnotdoneincrementallybyaccident
6.Comparedtoasequenceofmachinecodeinstructions,afragmentofCcode（a）
a.maydescribethesamealgorithm
b.isthenativewaytoprogrammostcomputers
c.describestheactionsofthecomputer,notjustoftheCPU
d.doesnotengageanytransistorsduringitsexecution
7.Whichofthefollowingdoesadebuggerdo?
（c）
1.Analyzethesourcecodetofindprogrammingerrors.
2.Decodemachinecodegeneratedbyacompiler.
3.Stopexecutionofaprogram.
a.I,II,andIII.
b.IandIIIonly
c.IIandIIIonly
d.IIIonly
8.Whenusingadebuggertofindthecauseofaprogram'sincorrectbehavior,（a）
a.itisoftennecessarytostarttheprogrammultipletimesunderthedebugger
b.thefaultycodefragmentmustfirstbeidentified
c.theprogramisusuallyexecutedtothepointatwhichthebehavioroccursandthenexecutedbackwardstofindthecause
d.itisfastesttostartbystoppingthedebuggerlongbeforethebehaviorappears
MultipleChoiceQuiz2
1.Inacomputerwith4-bytewords,whichofthefollowingCexpressionstestswhetherptrcontainstheaddressofaword?
（c）
I.（ptr&3）==0
II.（ptr|3）==0
III.（ptr%4）==0
a.IIIonly
b.Ionly
c.IandIIIonly
d.IIonly
2.WhathappensinaCprogramwhenanadditionwouldcauseintegeroverflow?
（a）
a.Anincorrectresultisproducedandexecutioncontinues.
b.Anexception-handleriscalledwiththetwooperandsasparameters.
c.Executionisterminated.
d.Thecorrectvalueiscoercedtoafloatingpointnumber.
3.InC,whatisthefollowingbinarynumberinhexadecimal?
（a）
11010101
a.0xD5
b.0x5D
c.0xB5
d.0xAB
4.Whatisthepurposeoftheexponentinfloatingpointnumbers?
（c）
a.tospecifythebaseasbinary,octal,orhexadecimal
b.themantissaisraisedtothepoweroftheexponent
c.toindicatewherethedecimalorbinarypointshouldbe
d.tospecifythesuperscript
5.Howis-10（decimal）representedinan8-bit2'scomplementbinaryformat?
（a）
a.11110110
b.11110101
c.10001010
d.11111010
6.InC,usingdefaultfloatingpointsettings,whathappenswhenafloating-pointcomputationresultsinanoverflow?
（c）
a.Anerroneousvalueiscomputedandexecutioncontinues.
b.Programexecutionishalted.
c.Aspecialvalue"infinity"iscomputed,testablewith_finite（）.
d.Anexceptionisraisedunlessdisabledbycalling_controlfp（）.
7.WhatisthevalueofthefollowingCexpression?
（c）
0x1234&0x5432
a.0x1111
b.0x6666
c.0x1030
d.0x5636
8.Whichofthefollowingnumericaloperationsismostlikelytoleadtolossofprecision?
（c）
a.Floating-pointmultiplication
b.Integeraddition
c.Floating-pointaddition
d.Integermultiplication
9.Whichofthefollowingcouldberepresentedbyonebitofinformation?
（c）
a.thecolorofasinglepixelonatrue-colorcomputerdisplay
b.anASCIIcharacter
c.thepositionofalightswitch
d.thecurrentchannelofatelevisionreceiver
10.Whichofthefollowingstatementsaboutfloating-pointnumbersinCistrue?
（a）
I.Floating-pointnumbersareoftenonlyapproximationsofrealnumbers.
II.A32-bitfloatonlyapproximatesdecimalfractions,buta64-bitdoublerepresentsthemexactly.
III.Floating-pointnumberscanrepresentanyrationalrealnumberbutnotirrationals.
a.Ionly
b.IandIIIonly
c.IIonly
d.IandIIonly
11.Howis46（decimal）representedinan8-bit2'scomplementbinaryformat?
（a）
a.00101110
b.01000110
c.00011110
d.00101100
12.WhatisthevalueofthefollowingCexpression?
（d）
0x1234^0x5432（这是XOR运算）
a.0x1030
b.0x5434
c.0x5636
d.0x4606
MultipleChoiceQuiz3
1：
Theprogramcountercontains（D）
a.thenumberofCPUinstructionsaprogramhasexecutedsofar
b.thenumberoftimesaprogramhasbeenexecuted
c.theamountofmemoryaprogramiscurrentlyusing
d.theaddressoftheCPUinstructionthatisabouttobefetched
2:
Whichofthefollowingisagoodreason（aregoodreasons）toequiptheCPUwithsmallamountsoffastmemory?
（a）
I.Tomakethedesignofthecompilersimpler
II.TomakesomeCPUinstructionssmaller
III.TomakesomeCPUinstructionsfaster
a.IIandIIIonly
b.I,II,andIII
c.IIIonly
d.IIonly
3.WhichofthefollowingmustbetrueifaprogramisstoppedataspecificlinewithintheVisualC++debugger?
（D）
I.Thereisatleastonebreakpointenabled.
II.Thereisabreakpointenabledonthatline.
III.Thereisabreakpointenabledonthelineprecedingthatline.
a.Ionly
b.IandIIonly
c.IandIIIonly
d.none
4:
ProgramscompiledforanIntelPentiumprocessordonotexecuteproperlyon
aSPARCprocessorfromSunMicrosystemsbecause（B）
a.copyrightsregardingcodecannotbeviolated
b.theoperationcodesunderstoodbythetwoprocessorsaredifferent
c.theassemblymnemonicsforthesame"opcode"aredifferentinthetwoprocessors
d.thememoryofaSPARCCPUisnumberedfromtoptobottom
5:
WithinVisualC++,whichofthefollowingwillrevealthevalueofvariablewhentheprogramisstoppedatabreakpoint?
（B）
I.Placingthemousepointeroverthevariablenameinthesourcefilewindow.
II.Insertingaprintf（）intheprogram.
III.Typingthevariablenameonthe"Watch"window.
a.IIIonly
b.IandIIIonly
c.I,II,andIII
d.IIandIIIonly
6:
ImmediatelyaftertheCPUexecutesaninstructionthatisneitherabranch
norajumpinstruction,theprogramcounter（B）
a.remainsunchanged
b.isincrementedtopointtothefollowinginstruction
c.hasavaluethatcannotbedeterminedwithoutfurtherinformation
d.isincrementedbyone
7:
ACPUregisterisawordofCPUmemorythat（C）
a.housesacriticalvariableforthedurationoftheexecutionofaprogram
b.recordstheresultsofperiodicCPUdiagnostics
c.isexplicitlyloadedandunloadedfromnormalmemorybycompiler-generatedinstructions
d.isautomaticallyloadedwhenaCPUinstructionreferstoawordofnormalmemory
8:
WhichofthefollowingcomputationsmaybeperformedbyexactlyoneCPUinstruction?
（A）
1.a=5;
2.a=b+c*5;
3.for（i=0;i<10;i+=a[i++]）;
a.Ionly
b.IIonly
c.I,II,andIII
d.IandIIonly
9:
Supposethat,usingatoolsuchasthememorywindowofVisualC++,wefoundthatacertainsetofcontiguousmemorylocationscontainedtheinteger0xC605CD623A8365000000.Whatcouldthesememorylocationshold?
（D）
1.theinteger0xC605CD623A8365000000
2.astring
3.aCPUinstruction
a.Ionly
b.IIIonly
c.IandIIonly
d.I,II,andIII
10:
Abranchinstruction（A）
a.setstheprogramcountertooneoftwopossiblevalues
b.increasestheprogramcounterbyafixedamount
c.setstheprogramcountertooneofmanypossiblevalues
d.unconditionallysetstheprogramcountertoitsoperand
11:
Ajumpinstruction（D）
a.changestheprogramcounteronlyifitsoperandisequaltozero
b.changesapointertopointtothenextelementofanarray
c.increasestheprogramcounter
d.unconditionallysetstheprogramcountertoitsoperand
12:
Themachinecodegeneratedfromsourcecodebyacompiler（C）
a.associatesvariablevalueswiththeirnames
b.executesmorequicklythanthesourcecode
c.doesnotpreservealltheinformationgiveninthesourcecode
d.canbeeasilyinspectedtocheckthecorrectnessofthecompiler
13:
Whichofthefollowingaretrueoftheeffectthatoptimizationshaveonthemachinecodegeneratedbycompilers?
（B）
I.Theresultingcodewillbefasterand/orsmaller.
II.Theresultingcodewillbeclearer.
III.Theresultingcodewillbehardertodebug.
a.I,II,andIII
b.IandIIIonly
c.IandIIonly
d.Ionly
MultipleChoiceQuiz4
1：
InC,assumingthataninttakes4bytes,ifarrayaisdeclar
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