50道javase练习题50道javase练习题docx.docx
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50道javase练习题50道javase练习题docx
50道javase练习题（50道javase练习题）
[program1]
Title:
classicalquestion:
thereareapairofrabbits,bornfromthirdmonthsafterbirtheachmonthapairofrabbits,smallrabbitsgrowuptothirdmonthslater,everymonthandapairofrabbits,iftherabbitdoesnotdie,
Whatisthetotalnumberofrabbitspermonth?
1.programanalysis:
thenumberofrabbits・
1,1,2,3,5,&13,21…
[program2]
Topic:
determinethenumberofprimesbetween101-200,andtheoutputofallprimenumbers・
1.programanalysis:
themethodofjudgingprimenumbers:
remove2tosqrt（anumber）withanumber,ifdivisible,
Itindicatesthatthisnumberisnotprime,andisaprimenumber・
[program3]
Title:
printoutallthe"Narcissusnumbers",socalled''narcissusnumber"referstoathreedigitnumber,thenumberofcubicandequaltothenumberitself.Forexample,"153〃isanarcissusnumber,
Becausethreetimesthreetimesthreetimes5+3153=1.
1.programanalysis:
usetheforcycletocontrol100-999numbers,eachnumberdecomposesabit,tenbits,hundreds・
[program4]
Title:
apositiveintegerdecompositionofthequalityfactor・Forexample:
enter90,printout90=2*3*3*5・
Programanalysis:
todecomposetheprimefactorofN,weshouldfirstfindaminimumprimenumberk,andthencompletethefollowingsteps:
（1）iftheprimenumberisequaltoN,theprocessofdecomposingtheprimefactorisfinishedandprintedout.
（2）ifn<>k,butnisdivisiblebyK,thevalueofKshouldbeprinted,anddividedbyNK,apositiveintegerasanewnyourepeatthefirststep・
（3）ifnisnotdivisiblebyK,withk+1asthevalueofK,repeatthefirststep・
[program5]
Title:
usethenestingofconditionaloperatorstocompletethisquestion:
studentswithacademicscores>=90pointsarerepresentedbyA,60-89pointsarerepresentedbyB,and60pointsarerepresentedbyC・
1.programanalysis:
（a>b）a:
b?
Thisisabasicexampleoftheconditionaloperator・
[program6]
EntertwopositiveintegersmandN,findthegreatestcommondivisorandleastcommonmultiple・
1.programanalysis:
usingrollingmethod・
[program7]
Title:
enteralineofcharacters,respectively,thenumberofEnglishletters,spaces,numbetsandothercharacters・
1.programanalysis:
usingthewhilestatement,fortheinputcharacterisnot，\n.
[program8]
Topic:
s=a+aa+aaa+aaaa+aa・・・A,whereaisanumber・Forexample,2+22+222+2222+22222（thetotalsumof5numbers）,afewnumberswithkeyboardcontro1.
1.programanalysis:
thekeyistocalculateeachitemvalue・
[program9]
Topic:
ifanumberisexactlyequaltothesumofitsfactors,thisnumberiscalled"endofafew〃.Forexample6=123・programmingtofindallcompletedwithin1000.
[program10.
Topic:
aballfromafreefallheightof100meters,eachlandinghalfantijumpbacktotheoriginalheight;thenfall,foritinthetenthfloor,howmanymeters?
Howhighisthereboundforthetenthtime?
[program11_
Title:
1,2,3,4numbers,howmanydifferentnumberscanbeformedwithouteachotherandthreedigits?
Howmucharethey?
1.programanalysis:
canfillat100,ten,anumberis1,2,3,4.Thenremovethearrangementdoesnotmeettheconditionwhichallarranged・
[program12_
Title:
corporatebonusesbasedonprofits・Profit（I）lessthanorequalto10millionyuan,thebonuscanbe10%;profithigherthan10million,lessthan20million,lessthan10millionpartofthe10%Commission,higherthan10million,cocoapercentagebetween20millionto7.5%;40million,20millionhigherthantheparttheCoinmission,5%;40millionhigherthanthepartbetween40millionto60million,totheCommissionof3%;
between60millionto100million,higherthan60million,totheCommissionof1.5%,higherthan100million,
Morethan1millionyuanpartoftheCommissionby1%,fromthekeyboardinputmonthprofitI,thetotalamountofbonusshould
beawarded?
1.programanalysis:
pleaseuseafewaxestoboundaries,positioning.Notethatthedefinitionneedstodefineintegergrowthbonus・
[program13.
Title:
aninteger,plus100,isaperfectsquarenumber,plus168isacompletesquarenumber,whatisthenumber?
1.programanalysis:
judgmentinlessthan100thousand,thenumberofthefirstand100aftertheroot,thenthenumberofplus268afterprescribing,ifafterprescribingresultsmeetthefollowingconditions,whichistheresultof.Pleaseseetheconcreteanalysis:
[program14.
Enteracertainperiodofaday,judgmentdayisthefirstfewdaysthisyear?
1.programanalysis:
inMarch5th,forexample,shouldfirstaddupthefirsttwomonths,andthenadd5days,thatis,thefirstfewdaysoftheyear,specialcircumstances,leapyearandinputmonthisgreaterthan3,needtoconsidermorethanoneday.
[program15.
Enterthreeintegersx,y,Z,pleaseputthethreenumberofsmalltolargeoutput.
1.programanalysis:
wetrytogetthesmallestnumberonX,thefirstXcomparedwiththeY,ifx>ywillXandYvaluesofexchange,andthenxandZarecompared,ifx>ZwillXandZvaluesofexchange,sothattheminimumX.
[program16_
Topic:
theoutputof9*9formulas・
1.programanalysis:
branchesandareconsideredatotalof9rows9,Icontrolline,Jcontro1.
[program17_
Themonkeyeatsthepeachproblem:
themonkeytakesoffseveralpeachesonthefirstday,eatshalfimmediately,isnotaddicted,eatsonemoresecond,inthemorning,willeatthepeachremaininghalf,haseatenonemore・AftereverymorningtoeattherestofthedaybeforeaYibanlingyi.Thetenthdayinthemorningtoeat,seeonlyapeach・Howmuchdidyoupickupforthefirstday?
・
1.programanalysis:
adoptthemethodofreversethinking,forwardinferencefrom・
[program18_
Title:
twotabletennisteamcompetition,eachpersonthree・Ateamofa,B,Cthree,BteamsfortheX,y,Zthree・Thelistofmatcheshasbeendrawn.Someoneaskstheplayersforalistofthematches・Asaidheisnotmorethanx,Csaidhedidnotx,Z,programmedtoidentifyalistofthreeteamsracing・
1.programanalysis:
judgetheprimenumbermethod:
useanumbertoremove2tosqrt（thisnumber）,ifcanbedivisible,itshowsthatthisnumberisnotprime,andviceversaisprimenumber・
[program19_
Title:
printthefollowingpattern（diamond）
*
***
Tiananmen
Result
Tiananmen
***
*
1.programanalysis:
first,thegraphicsaredividedintotwopartstosee,thefirstfourlinesofarule,thelatterthreelinesofarule,theuseofdoubleforcycle,thefirstlayercontrolline,thesecondlayercontrolcolumn.
Thereisasequenceoffractions:
2/1,3/2,5/3,8/5,13/8,21/13・・・Andthesumofthefirst20oftheseries.
1.programanalysis:
pleaseseizethechangerulebetweenthenumerator・
[program21_
Title:
1+2!
+3!
+...+20!
1.programanalysis:
thisprocedureistobringthecumulativebecomeamultiplicative・
[program22]
Topic:
usingrecursivemethodtofind5!
・
1.programanalysis:
recursiveformula:
fn二fn_1*4!
[program23]
Topic:
thereare5peoplesittogether,askthefifthpersonhowold?
Hesaidhewas2yearsolderthanfourth・Askfourthpeopleage,hesaidthatmorethanthirdpeoplein2years・Askthirdpeople,morethansecondpeopleandtwo.Asksecondpeople,twoyearsolderthanthefirstpersonsaid・Finallyaskedthefirstman,hesaid,10yearsold.Howbigarefifthpeople?
1.programanalysis:
usingtherecursivemethod,recursiveand
recursivebacksteppingisdividedintotwostages・Ifyouwanttoknowtheageoffifthpeople,youneedtoknowtheageofthefourthperson,andinturn,pushtothefirstperson（10yearsold）,andthenpushback・
[program24]
Title:
giveanomorethan5positiveintegers,requirements:
first,askitisafewdigits,two,reverseprintoutyourfigures・
[program25]
Title:
a5digit,itisnotapalindromejudgment・That12321isapalindrome,abitandbitthesametenmillion,withthousandsofthesame・
[program26]
Title:
enterthefirstletteroftheweektodeterminewhatdayitis.Ifthefirstletteristhesame,thencontinuetojudgethesecondletter・
1.programanalysis:
usingthesituationstatementisbetter,ifthefirstletteristhesame,thenjudgetousethesituationstatementorifsentencetodeterminethesecondletters・
[program27.
Title:
seekingprimeswithin100
Title:
sorting10numbers
1.programanalysis:
canusetheselectionmethod,from9monthsafterthecomparisonprocess,selectaminimumexchangewiththefirstelement,thenextanalogy,withsecondelementsand8Comparisonandexchange・
[program29]
Topic:
finda3*3matrixanddiagonalelements
1.programanalysis:
usedoubleforcyclecontrolinputtwo-dimensionalarray,andthenaccumulatea[i][i]output・
[program30.
Topic:
asortedarray.Nowenteranumber,accordingtotherequirementsoftheoriginallawitisinsertedintothearray.
1.programanalysis:
firstdeterminewhetherthenumberisgreaterthanthelastnumber,andthenconsidertheinsertionofthenumberofthemiddle,afterinsertingtheelementafterthenumber,followedbyaposition・
[program31_
Title:
outputanarrayinreverseorder・1.programanalysis:
thefirstandthelastexchange.
Topic:
takeanintegerafromtherightendofthebeginningofthe4~7.
Programanalysis:
thiscanbeconsidered:
（1）moveato4bitfirst・
（2）tosetupalowof4for1,therestofthenumber0.Available〜（〜0<<4）
（3）carryontheabovetwooperations・
[program33.
Title:
printYangHuitriangle（printout10linesasshownbelow）
1.programanalysis:
One
11
121
14641
15101051[program34]
Topic:
enterthenumber3A,B,C,accordingtothesequenceofoutput・
1.programanalysis:
usingpointermethod・
[program35]
Theinputarray,th
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