面向对象的C++程序设计第六版课后习题答案第三章

Chapter3

MOREFLOWOFCONTROL

1.SolutionsforandRemarksonSelectedProgrammingProblems

Inordertopreserveflexibilityofthetext,theauthorhasnotdealtwithclassesinthischapteratall.Tohelp

thosewhoreallywanttodothingswithclasses,someoftheProgrammingProjectswillbecarriedoutusing

oneorseveralclasses.

1.RockScissorsPaper

Hereeachoftwoplayerstypesinoneofstrings"Rock","Scissors",or"Paper”.Afterthesecondplayerhas

typedinthestring,thewinnerofthisgameisdeterminedandannounced.

Rules:

RockbreaksScissors

ScissorscutsPaper

PapercoversRock

Ifbothplayersgivethesameanswer,thenthereisnowinner.

Anicetouchwouldbetokeepandreporttotalwinsforeachplayerasplayproceeds.

Tofindtheclasses,wenotefirstthatthereare2identicalplayers.Theseplayersrecordthecharacterentered,

andkeeptrackofthewins.Thereisaconstructorthatsetsthetotalwinsto0.Thereisaplay()member

functionthatpromptsforandgetsfromthekeyboardreturnsoneofthecharactersR,P,orS'forrock,

paperandscissors.Thereisanaccessormemberfunctionforchandanincrementormemberfunctionfor

accumulatedwinssothatastandalonefunctionintwin(ch,ch);candeterminewhowinsandincrementthe

accumulatedwinsvariable.

(Abettersolutionwouldmakethewinsfunctionafriendofclassplayersothatwinscanhaveaccess

totheeachplayer'sprivatedatatodeterminewhowinsandupdatetheaccumulatedwinswithouttheaccessor

functionch()andincrementwins()function.)

NotethatIhaveleftabitofdebuggingcodeintheprogram.

classplayer

(

publicfunctionmembers

constructors()

Copyright©2007PearsonEducation,Inc.PublishingasPearsonAddison-Wesley

play()；//promptsforandgetsthisplayer'smove

charch()；//accessor

intaccumulatedWins()；//accessor

incrWins()；//incrementswincount

privatedata

charactertypedin

accumulatedWins

);

intwins(playeruserl,playeruser2)；

//playerl*scharacteriscomparedtoplayer2'scharacterusingaccessor

//functions.

//winsreturns

//0iftherenowinner

//1ifplayer1wins,

//2ifplayer2wins,

//callstheappropriateincrWins()toupdatethewins

Notethatoncetheclassisdefinedandtheauxiliaryfunctionwritten,thecode“almostwritesitself.”

//file：ch3Prbl.cc

//RockPaperScissorsgame

//class/objectsolution

#include<iostream>

#include<cctype>//forinttoupper(int)；

usingnamespacestd；

classPlayer

(

public：

Player()；

voidplay()；//promptsforandgetsthisplayer'smove

charCh()；//accessor

intAccumulatedWins()；//accessor

voidIncrWins()；//incrementswincount

private：

charch；//charactertypedin

inttotalwins；//totalofwins

);

Player：：Player()：totalWins(0)//intializersetsPlayer：：totalWinsto0

(

//Thebodyisdeliberatelyempty.ThisisthepreferredC++idiom.

//Thisfunctioncouldbewrittenomittingtheinitializer,and

//puttingthislineinthebody：

//totalwins=0；

)

voidPlayer：：play()

(

cout<<"PleaseentereitherR)ockzP)aperzorS)cissors."

<<endl；

cin>>ch；

ch=toupper(ch)；//nocastneeded,chisdeclaredtobechar

)

charPlayer：：Ch()

(

returnch；

)

intPlayer：：AccumulatedWins()

(

returntotalwins；

)

voidPlayer：：IncrWins()

(

totalWins++；

)

intwins(Playersuserl,Player&user2)；

//playerl'scharacteriscomparedtoplayer2'scharacter

//usingaccessorfunctions.

//Thefunctionwinsreturns

//0iftherenowinner

//1ifplayer1wins,

//2ifplayer2wins,

//callstheappropriateIncrWins()toupdatethewins

intwins(Player&userl,Player&user2)//thismustchangeuserl

//anduser2

if((1R,==userl.Ch()&&•s'==user2.Ch())||

('P'==userl.Ch()&&'R'==user2.Ch())||

('S'==userl.Ch()&&'P1==user2.Ch()))

(

//user1wins

userl.IncrWins()；

return1；

)

elseif(('R1==user2.Ch()&&'S'==userl.Ch())

||('P'==user2.Ch()&&'R*==userl.Ch())

||('S'==user2.Ch()&&'P1==userl.Ch()))

(

//user2wins

user2.IncrWins()；

return2；

)

else

//nowinner

return0；

)

intmain()

(

Playerplayerl；

Playerplayer2；

charans='Y'；

while(*Y'==ans)

(

playerl.play()；

player2.play()；

switch(wins(playerl,player2))

(

case0：

cout<<"Nowinner."<<endl

<<•'Totalstothismove：•'<<endl

<<"Player1："<<playerl.AccumulatedWins()

<<endl

<<"Player2：n<<player2.AccumulatedWins()

<<endl

<<"Playagain?Y/ycontinuesotherquits"；

cin>>ans；

cout<<"Thanks"<<endl；

break；

case1：

cout<<"Player1wins."<<endl

<<"Totalstothismove："<<endl

<<"Player1："<<playerl.AccumulatedWins()

<<endl

<<"Player2:"<<player2.AccumulatedWins()

<<endl

<<"PlayAgain?Y/ycontinues,otherquits.

cin>>ans；

cout<<"Thanks"<<endl；

break；

case2：

cout<<"Player2wins."<<endl

<<•'Totalstothismove："<<endl

"Player1：<<playerl.AccumulatedWins()

<<endl

"Player2：<<player2.AccumulatedWins()

<<endl

<<"PlayAgain?Y/ycontinues,otherquits.n；

cin>>ans；

cout<<"Thanksn<<endl；

break；

)

ans=toupper(ans)；

)

return0；

)

Atypicalrunfortheclass/objectsolutionfollows:

PleaseentereitherR)ock,P)aper,orS)cissors.

R

PleaseentereitherR)ock,P)aperzorS)cissors.

S

insideIncrWins()

1

Player1wins.

Totalstothismove：

Player1：1

Player2：0

PlayAgain?Y/ycontinueszotherquits.y

Thanks

PleaseentereitherR)ock,P)aper,orS)cissors.

S

PleaseentereitherR)ockzP)aperzorS)cissors.

P

insideIncrWins()

2

Player1wins.

Totalstothismove：

Player1：2

Player2：0

PlayAgain?Y/ycontinueszotherquits.y

Thanks

PleaseentereitherR)ock,P)aperzorS)cissors.

P

PleaseentereitherR)ockzP)aperzorS)cissors.

S

insideIncrWins()

1

Player2wins.

Totalstothismove：

Player1：2

Player2：1

PlayAgain?Y/ycontinueszotherquits.y

Thanks

PleaseentereitherR)ockzP)aperzorS)cissors.

P

PleaseentereitherR)ockzP)aperzorS)cissors.

P

Nowinner.

Totalstothismove：

Player1：2

Player2：1

Playagain?Y/ycontinuesotherquitsq

Thanks

1.RockScissorsPaper-Conventionalsolution:

HereeachoftwoplayerstypesinoneofstringsuRockn,"Scissors",orHPaper".Afterthesecondplayerhas

typedinthestring,thewinnerofthisgameisdeterminedandannounced.

Rules:

RockbreaksScissors

ScissorscutsPaper

PapercoversRock

Ifbothplayersgivethesameanswer,thenthereisnowinner.

Anicetouchwouldbetokeepandreporttotalwinsforeachplayerasplayproceeds.

Thisisaconventionalsolutiontotheproblem.

//filech3nlcon.cc

//conventionalsolutiontotheRockScissorsPapergame

#include<iostream>//streamio

#include<cctype>//forinttoupper(int)

usingnamespacestd；

intwins(charchi,charch2)

if(('R'==chi&&'S'==ch2

(1P'==chi&&'R'==ch2)11

(S==chi&&'P'==ch2

return1；//player1wins

elseif(('R'==ch2&&S==chi)11

('P'==ch2&&'R'==chi)11

(S==ch2&&'P«==chi))

return2；//player2wins

else

return0；//nowinner

)

charplay()

(

charch；

cout<<"PleaseentereitherR)ock,P)aperzorS)cissors."<<endl；

cin>>ch；

returntoupper(ch)；//nocastneeded,charisreturntype

)

intmain()

(

intwins_l=0；

intwins_2=0；

charchi；

charch2；

charans='Y'；

while('Y1==ans)

(

chi=play()；

ch2=play()；

switch(wins(chi,ch2))

(

case0：

cout<<"Nowinner."<<endl

<<•'Totalstothismove："<<endl

<<"Player1：H<<wins_l<<endl

<<*'Player2："<<wins_2<<endl

<<"Playagain?Y/ycontinuesotherquits"

cin>>ans；

cout<<"Thanks”<<endl；

break；

case1：

wins_l++；

cout<<"Player1wins."<<endl

<<"Totalstothismove：•'<<endl

<<"Player1：u<<wins_l<<endl

<<"Player2：n«wins_2<<endl

<<"PlayAgain?Y/ycontinues,otherquits.

cin>>ans；

cout<<"Thanks"<<endl；

break；

case2：

wins_2++；

cout<<"Player2wins."<<endl

<<"Totalstothismove："<<endl

<<"Player1：*'<<wins_l<<endl

<<"Player2："<<wins_2<<endl

<<"PlayAgain?Y/ycontinues,otherquits."

cin>>ans；

cout<<"Thanks"<<endl；

break；

)

ans=toupper(ans)；

)

return0；

)

Atypicalrunfollowsfortheconventionalsolutionisessentiallythesameasforthe'class'basedsolution.

2.CreditAccountproblem.-class/objectsolution

Computeinterestdue,totalamountdue,andminimumpaymentforarevolvingcreditaccount.

Inputs：accountbalance

Process：Computesinterest

interestaccordingto：

1.5%on1st$1000

1.0%onallover$1000

addsthistoaccountbalancegettotaldue.

Computesminimumpaymentaccordingto：

ifamountdue<$10,

minimumpaymentistotaldue

else

minimumpaymentis10%oftotaldue

outputs：Interestdue,totalamountdue,minimumpayment

Theclassistheaccount.

thepublicinterfacehasfunctions：

constructors

defaultconstructor

constructorwithparameterbalance,

computesinterest,totalduezminimumpay

interestDue()reportsinterest

totalDue()reportstotalamountdue

minPayDue()reportsminimumpaymentdue

privatedata

balance

totaldue

interestdue

minimumpayment

Class-objectImplementation：

//file：ch3prb2.cc

//Interest

//class-objectsolution

//Purpose：Computeinterestdueztotalamountduezandminimumpayment

//forarevolvingcreditaccount.

//

//Inputs：accountbalance

//

//Process：Computesinterest

//interestaccordingto：

//1.5%on1st$1000ofbalance

//1.0%onallover$1000ofbalance

//addsthistoaccountbalancegettotaldue.

//Computesminimumpaymentaccordingto：

//ifamountdue<$10,

//minimumpaymentistotaldue

//else

//minimumpaymentis10%oftotaldue

//

//outputs：Interestdue,totalamountdue,minimumpayment

#include<iostream>

usingnamespacestd；

constdoubleINTEREST_RATE1=0.015;

constdoubleINTEREST_RATE2=0.01;

constdoubleMINPAY_FRACTION=0.10;

classCreditAccount

(

public：

CreditAccount()；//setseverythingto0

CreditAccount(doublebalance)；//computeseverythingneeded

doubleinterestDue()；

doubletotalDue()；

doubleminPayDue()；

private：

doublebalance；

doubleinterestDue；

doubletotalDue；

doubleminPay；

)；

doubleCreditAccount：：interestDue()

(

returninterestDue；

)

doubleCreditAccount：：totalDue()

(

returntotalDue；

)

doubleCreditAccount：：minPayDue()

(

returnminPay；

)

CreditAccount：：CreditAccount()

：balance(0)ztotalDue(0)zinterestDue(0)zminPay(0)

(

//Bodydeliberatelyleftempty.

//ThisisaC++idiom.SeethisIRMChapter10.

//ThisiscoveredinAppendix7ofthetext

)

CreditAccount：：CreditAccount(doublebalance)

if(balance<=1000)

interestDue=balance*INTEREST_RATE1；

elseif(balance>1000)

interestDue=1000*INTEREST_RATE1+(balance-1000)*INTEREST_RATE2;

totalDue=balance+interestDue；

if(totalDue<=10)

minPay=totalDue；

else

minPay=totalDue*MINPAY_FRACTION；

)

intmain()

(

cout.setf(ios：：showpoint)；

cout.setf(ios：：fixed)；

cout.precision(2)；

charans；

doublebalance；

do

(

cout<<"Entertheaccountbalance,please："；

cin>>balance；

CreditAccountaccount(balance)；

cout<<"Interestdue："<<erestDue()<<endl

<<•'Totaldue："<<account.totalDue()<<endl

<<"MinimumPayment："<<account.minPayDue()<<endl；

cout<<"Y/yrepeats.anyotherquits"<<endl；

cin>>ans；

)

while(1y,==ans||1Y'==ans)；

)

Atypicalrunfortheclass/objectsolutionfollows:

Entertheaccountbalance,please：9.00

Interestdue：0.14

Totaldue:9.13

MinimumPayment：9.13

Y/yrepeats.anyotherquits

y

Entertheaccountbalancezplease：9.85

Interestdue：0.15

Totaldue：10.00

MinimumPayment：10.00

Y/yrepeats.anyotherquits

y

Entertheaccountbalancezplease：985.22

Interestdue：14.78

Totaldue：1000.00

MinimumPayment：100.00

Y/yrepeats.anyotherquits

y

Entertheaccountbalancezplease：1000

Interestdue：15.00

Totaldue：1015.00

MinimumPayment：101.50

Y/yrepeats.anyotherquits

y

Entertheaccountbalancezplease：2000

Interestdue：25.00

Totaldue:2025.00

MinimumPayment：202.50

Y/yrepeats.anyotherquits

q

2.CreditAccountproblem-Conventionalsolution

Computeinterestdue,totalamountdue,andminimumpaymentforarevolvingcreditaccount.

Inputs：accountbalance

Process：Computesinterest

interestaccordingto：

1.5%on1st$1000

1.0%onallover$1000

addsthistoaccountbalancegettotaldue.

Computesminimumpaymentaccordingto：

ifamountdue<$10z

minimumpaymentistotaldue

else

minimumpaymentis10%oftotaldue

outputs：Interestdue,totalamountdue,minimumpayment

data

balance

totaldue

interestdue

minimumpayment

//file：ch3n2con.cc

//conventionalsolution

//

//Purpose：Computeinterestdue,totalamountdue,andminimumpayment

//forarevolvingcreditaccount.

//

//Inputs：accountbalance

//

//Process：Computesinterest

//interestaccordingto：

//1.5%on1st$1000ofbalance

//1.0%onallover$1000ofbalance

//addsthistoaccountbalancegettotaldue.

//Computesminimumpaymentaccordingto：

//ifamountdue<$10z

//minimumpaymentistotaldue

//else

//minimumpaymentis10%oftotaldue

//

//Outputs：Interestdueztotalamountdue,minimumpayment

#include<iostream>

usingnamespacestd；

constdoubleINTEREST_RATE1=0.015;

constdoubleINTEREST_RATE2=0.01;

constdoubleMINPAY_FRACTION=0.10;

doubleinterestDue(doublebalance)

if(balance<=1000)

returnbalance*INTEREST_RATE1；

return1000*INTEREST_RATE1+(balance-1000)*INTEREST_RATE2;

)

doubleminPay(doubletotalDue)

(

if(totalDue<=10)

returntotalDue；

returntotalDue*MINPAY_FRACTION;

)

intmain()

(

doublebalance；

doubleinterestDue；

doubletotalDue；

doubleminPay；

cout.setf(ios：：showpoint)；

cout.setf(ios：：fixed)；

cout.precision(2)；

charans；

do

(

cout<<•'Entertheaccountbalance,please："；

cin>>balance；

interestDue=interestDue(balance)；

totalDue=balance+interestDue；

minPay=minPay(totalDue)；

cout<<"Interestdue："<<interestDue<<endl

<<"Totaldue：H<<totalDue<<endl

<<"MinimumPayment："<<minPay<<endl；

cout<<"Y/yrepeats.anyotherquits"<<endl；

cin>>ans；

)

while('y'==ans||'Yans)；

)

Atypicalrunfortheconventionalsolutiondoesnotdiffersignificantlyfromthe'class'basedsolution.

3.AstrologyClass/Objectsolution.

Notes:

Ihavenotdoneaconventionalsolution.Allthebitsandpiecesnecessarytodoaconventionalsolutionare

presenthere.Ialsohavenotdonetheenhancementssuggested.Ihave,however,includedcommentsthat

suggesthowtocarryouttheseenhancements.

Ihaveusedslightlymodifiednew_lineanddisplay_linecodefromthetext.Encouragestudentsnotto

reinventthewheel,thatis,tousebitsandpiecescodefromthebookandothersourcesaslongascopyrights

arenotviolated.

Iusedalibrarybookonastrologyformyreference.Anewspaperworksaswell.

Planning:

Input:user'sbirthday.Month1-12,day1-31

Process:tablelookupofsignsandhoroscopes,withrepeatatuser'soption

Output:SignoftheZodiacandhoroscopeforthatbirthday.

Hint:useranewspaperhoroscopefbrnames,datesanda

horoscopeforeachsign.

Enhancement:Ifbirthdayiswithin2daysoftheadjacent

sign,announcethatthebirthdateisona"cusp"andoutput

thehoroscopefortheadjacentsignalso.

Commentsandsuggestions.Programwillhavealongmultiway

branch.Storethehoroscopesinafile.

Askyourinstructorforanyspecialinstructions,suchasfilenameor

locationifthisisaclassassignment.

Planningforthesolution:

Whataretheobjectandclasses?

TheAstrologicalChartwouldbetheclassifweweredoingafullchart.WeareonlyselectingtheSunSign,

butwestillletAstrobetheclass.

ZodiacSignnamesanddates:

AriesMarch21-April19

TarusApril20-May20

GeminiMay21-June21

CancerJune22-July22

LeoJuly23-August22

VirgoAugust23-September22

LibraSeptember23-October22

ScorpioOctober23-November21

SagittariusNovember22-December21

CapricornDecember21-January19

AquariusJanuary19-February18

PicesFebruary19-March20

Horoscopefilestructure.

Theinitial<cr>isnecessarygiventhiscodetopreventoutputfromrunningonfromthefirsthoroscope.(We

didnotmakeuseofthesignnumber.)

<cr>

signnumber

horoscope

#

signnumber

horoscope

#

andsoon.

Pseudocodefortheclassandwhatmemberfunctionsdo...

classAstro

(

public：

constructors

Astro();

Astro(Datebirthday)；

looksupandsetsthesignnumber,

Enhancement：

setsiscuspto-1ifbirthdayiswithin2days

beforetheadjacentsign,to-1ifwithin2days

afteradjacentsignand0ifneither.

memberfunctions

voidhoroscope()；

Enhancement：

ifiscusp==-1,reporthoroscopebeforethe

currentoneandthecurrentone.

elseifiscusp==1,reportthecurrenthoroscope

andtheonefollowing.

else//iscusp==0,dothedefaultaction：

Unenhancedaction：

Dumpthehoroscopesfromfileuptothecurrentone.

Displaycurrenthoroscope.

How?#issentinelforendofahoroscope.Dumphoroscopes

through(signNumber-1)#symbols,usingutility-

functions.Displaythroughnext#usingutility

functions.

private：

Daybirthday；

intsignNumber；

voidnewHoroscope(istream&inStream)；

//displayinStreamtonext#anddiscardthe#

voiddisplayHoroscope(istreamasourceFile)；

//readandignoreinStreamthroughthenext#

//Enhancement：

//intisCusp()；

Planningdone,nowtothecoding.Thecontentsof“horoscope.dat“arelistedwiththe'typicalrun'attheend

ofthefollowingcode.

//Program：file：ch3prb3.cc

//Requiresfile"horoscope.datnhavingstructure

//linesoftext

//#

//linesoftext

//#

//

//linesoftext

//#

#include<fstream>//forstreamio

#include<stdlib>//forexit()

usingnamespacestd；

//anenumcouldhavecertainlybeenusedhere

constintaries=1;

constinttaurus=2;

constintgemini=3;

constintcancer=4;

constintleo=5;

constintvirgo=6;

constintlibra=7;

constintscorpio=8;

constintSagittarius=9;

constintcapricorn=10

constintaquarius=11

constintpisces=12

//constmakescertainnoerrorthatchangestheseconstantsismade.

structmonth//nocheckingisdone...Lettheuserbewarned!

(

intday；//1..28zor29or30or31,dependingonmonth.

intmonth；//1..12

);

classAstro

(

public：

Astro();

Astro(monthbirthday)；

//looksupandsetsthesignnumber

//Enhancement：setsiscuspto-1ifbirthdayiswithin2days

//beforetheadjacentsign,to-1ifwithin2days

//afteradjacentsignand0ifneither.

voidhoroscope()；

//Enhancement：ifiscusp==-1,

//dump(signNumber-2)horoscopes

//elseifiscusp==1

//dump(signNumber-1)horoscopes

//displaynexttwohoroscopes.

//return；

//unenhancedaction：ifwegethereziscusp==0sowe

//dump(signNumber-1)horoscopes,

//displaynexthoroscope.

private：

monthbirthday；

intsignNumber；

voidnewHoroscope(istream&inStream)；

voiddisplayHoroscope(istream&sourceFile)；

//Enhancement：

//intisCusp；

);

//dumpsallfromfilethroughthenext#

voidAstro：：newHoroscope(istream&inStream)

(

charsymbol；

do

(

inStream.get(symbol)；

}while(symbol!=1#*);

//displaysallfromfilethroughthenext#

voidAstro：：displayHoroscope(istream&sourceFile)

charnext；

sourceFile.get(next)；

while(1#'!=next)

(

cout<<next；

sourceFile.get(next)；

)

)

voidAstro：：horoscope()

(

ifstreaminfile；

infile.open("horoscope.dat")；

intc；

//cusp==0case：dumpsignNumber-1horoscopes.

for(inti=1；i<signNumber；i++)

newHoroscope(infile)；

displayHoroscope(infile)；

cout<<endl；

//Enhancement,changefrom//cusp==0case：

//sothat

//if(cusp==-1)

//dumpthru(signNumber-2)horoscopes

//elseif(cusp==1)

//dumpthru(signNumber-1)hororscopes

//fromthisposition,

//displaytwohoroscopes

//return

//thisisthecusp=0case,asabove.

)

Astro：：Astro()//Iprefertousetheclassinitializerlist

{//notation.Thisfollowsthetext

signNumber=0；

//isCusp=0；//foroneoftheenhancementsIdidnotdo

)

Astro：：Astro(monthbirthday)

//intsignNumber(monthbirthday)〃totestthisturkey

//looksupandsetsthesignnumber,

(

switch(birthday.month)

(

case1：

if(birthday.day<=19)signNumber=capricorn；

elsesignNumber=aquarius；

//enhancementcodewilllooklikethisinallthecases：

//if(17<=birthday.day&&birthday.day<19)cusp=-1；

//elseif(19<birthday.day&&birthday.day<=21)cusp=-1；

//elsecusp=0；

//

break；

case2：

if(birthday.day<=18)signNumber=aquarius；

elsesignNumber=pisces；

break；

case3：

if(birthday.day<=20)signNumber=pisces；

elsesignNumber=aries；

break；

case4：

if(birthday.day<=19)signNumber=aries；

elsesignNumber=taurus；

break；

case5：

if(birthday.day<=20)signNumber=taurus；

elsesignNumber=gemini；

break；

case6：

if(birthday.day<=21)signNumber=gemini；

elsesignNumber=cancer；

break；

case7：

if(birthday.day<=22)signNumber=cancer；

elsesignNumber=leo；

break；

case8：

if(birthday.day<=22)signNumber=leo；

elsesignNumber=virgo；

break；

case9：

if(birthday.day<=22)signNumber=virgo；

elsesignNumber=libra；

break；

case10：

if(birthday.day<=22)signNumber=libra；

elsesignNumber=scorpio；

break；

case11：

if(birthday.day<=21)signNumber=scorpio；

elsesignNumber=Sagittarius；

break；

case12：

if(birthday.day<=21)signNumber=Sagittarius；

elsesignNumber=capricorn；

break；

default：cout<<"nosuchmonthas"<<birthday.month

<<"Aborting"<<endl；

exit(1)；

break；

)

)

intmain()

(

monthbirthday；

cout<<"Anynon-digitinthemonthfieldwillterminatetheprogram.

<<endl；

cout<<"Enterbirthdayinnumericform：monthday,as125：•'

<<endl；

cin>>birthday.month>>birt