C++大学教程课后习题答案7

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1、SavitchInstructor’sResourceGuideProblemSolvingw/C++,7eChapter8Chapter8StringsandVectors1.SolutionsforandCommentonSelectedProgrammingProblems1.FormataSentence.WhileitmaybecleanertouseStandardstringclassstringtodothisproblem,Ichosetouseonlythefeatureof

2、g>(or)todothisproblem.StudentsneedtobeabletousebothstringandC-stringfacilities.Thisprogramistoreadina(single)sentence(definedasasequenceofwordsterminatedbyaperiod(.).Thesentenceistobeformattedandwrittentotheoutput.Formattingconsistsofcapitalizingf

3、irstwordsinasentenceandcompressingallmultipleblankstosingleblanks.Forthispurpose,aline-breakisablank.Noothercapitallettersaretobeincludedintheoutput.Asentenceisassumedendwithaperiodandtherearenootherperiods.Input:geta100characterline.Theperiodistheterminati

4、ngsentinel.Theprocessscanstheline,capitalizingthefirstletterinthestring,lookingformultipleblankswhichiteats,exceptforone,andnewline==blank.Somequestionsaskedduringdesign:DoIreplacenew-lineswithblanks?Answer:Deferthisquestionuntillater.(Addedlater:Theansweri

5、syes)WhatdoIdowithsentencesthatarelongerthanmylinewidthonmyoutputdevice?Answer:Scanforandreplacenew-lineswithblanksbeforereplacingmultipleblankswithoneblank,andallowwrapsonoutput.Output:Copythemodifiedstringtotheoutput.ThissolutionusesonlytheCstylestringfea

6、tures.49Copyright©2008PearsonEducation,Inc.PublishingasPearsonAddison-WesleySavitchInstructor’sResourceGuideProblemSolvingw/C++,7eChapter8Theinputistakencharacterbycharacter.Ifaperiod(.)isencountered,theloopterminates.Process:First,anynew-linecharactersarer

7、eplacedbyblanks.Next,allcharactersaremadelowercase.Thereisaone-timeswitchtocapitalizethefirstnon-blank.Thereisastatemachineforcompressingmultipleblankstosingleblanks:Ifwehaveablankandhaven'tseenonesincethelastnon-blank,setavariable,have_blank.Nextifweseeabl

8、ankandhave_blankisalreadyset,causeoverwritingthecurrentblankwiththenewonebybackinguptheindextothesentencearraybyone.Oncewereadanon-blank,ifthehave_blanknoteissettotrue,turnitoff.Thesepieces,alongwithre