C大学教程课后习题答案15

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1、Chapter16ExceptionHandling1.SolutionstoandRemarksonSelectedProgrammingProblems1TimeWriteaprogramtocovnertfrom24-hourtimeto12-hourtime.Remarks:Thetextgivessampledialog.ThecodeIgiveproducesaslightlydifferentdialogthatdiagnosesparticularinputerrorsbyprovidinganappropriateme

2、ssagetotheexceptionobjectatthepointtheerrorisdetectedandtheexceptionisthrown.Thissolutionisonlyslightlymorecomplexthanasolutionthatgivestherequesteddialog.IusedtheclassDigtalTimefromChapter11asastartingpoint.Iremovedfunctionsnotneeded,andreplacedtheterminatingerrorreport

3、ingcodewithcallstotherequiredexception,TimeFormatError.Iprovidederrormessagesappropriatetotheparticularerrorsasdetected.Itheninsertedthetry-catchblocks,terminatingtheprogramattheerror.Afterthiswasrunning,Iprovidedtheloop,torequestrepetition.Bug(perhapsaquirk?):Ifaninpute

4、rrorcausesanexceptiontobethrown,thecodediagnosestheerror,thenimmediatelyrequestsanother24hourtimeforconverstionwithoutrequestingapprovalfromtheuser.//dtime•h//TakenfromChapter11////ThisistheHEADERFILEdtime・h・Thisisareductionof1Copyright©2008PearsonEducation,Inc.Publishin

5、gasPearsonAddison-Wesley//theINTERFACEfortheclassDigitalTimefromChapter11for//Chapter16ProgrammingProblem1•Theoperator==and//AdvancemembersarenotneededsoIdeletedthem.Ihave//addedtherequiredexceptionclassTimeFormatMistake•////Valuesofthistypearetimesofday.Thevaluesare//in

6、putandoutputin24hournotationasin9:30for9:30//AMand14:45for2:45PM.#ifndefDTIME_H#defineDTIME_H♦include#includeusingnamespacestd;classTimeFormatMistake{public:TimeFormatMistake(std::stringmesg)throw(){message=mesg;}stringwhat()throw()returnmessage;}privat

7、e:std::stringmessage;};classDigitalTime{public:DigitalTime(intthe_hour,intthe_minute)throw(TimeFormatMistake);//Precondition:0<=the_hour<=23and//0<=the_minute<=59・//Initializesthetimevaluetothe_hourandthe_minute.DigitalTime()throw();//Initializesthetimevalueto0:00(whichi

8、smidnight).voidTwelveHourTime();//returnsthetimein12hourformat:hh:mmAMor//hh:mmPMfriendstd::istream&ope