c++编程思想 课后答案第二章 其他章请点击用户名找 thinking in c++ annotated solution guide(charpter 2)

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1、[ViewingHints][BookHomePage][FreeNewsletter][Seminars][SeminarsonCDROM][Consulting]AnnotatedSolutionGuideRevision1.0forThinkinginC++,2ndedition,Volume1byChuckAllison©2001MindView,Inc.AllRightsReserved.[PreviousChapter][TableofContents][NextChapter]Chapter22-1ModifyHell

2、o.cppsothatitprintsoutyournameandage(orshoesize,oryourdog’sage,ifthatmakesyoufeelbetter).Compileandruntheprogram.Solution:TheoriginalHello.cppappearedinthetextasfollows://SayingHellowithC++#include//Streamdeclarationsusingnamespacestd;intmain(){cout<<"Hello,W

3、orld!Iam"<<8<<"Today!"<usingnamespacestd;intmain(){cout<<"Hello,World!IamChuckAllison."<

4、)"<

5、seofSheba’sage,Iprinted5asaninteger,butforMuffyIincludedthenumeralintheliteraltext.Inthiscaseitmakesnodifference,butwhenyouprintfloating-pointnumbersthathavedecimals,youget6decimalsbydefault.Brucediscusseslaterinthetexthowtocontroloutputoffloating-pointnumbers.2-2Start

6、ingwithStream2.cppandNumconv.cpp,createaprogramthatasksfortheradiusofacircleandprintstheareaofthatcircle.Youcanjustusethe‘*’operatortosquaretheradius.Solution:Thetwoprogramsmentionedaboveshowhowtodonumericinputandoutput.Thefollowingsolutiontothisexerciselikewiseusesthe

7、left-shiftandright-shiftoperatorsforinputandoutput,respectively.//:S02:Area.cpp//{-T}@echorunAreabyhand!#includeusingnamespacestd;intmain(){constfloatpi=3.141592654;cout<<"Entertheradius:";floatradius;cin>>radius;cout<<"Theareais"<

8、ampleExecution:c:>areaEntertheradius:12Theareais452.389*////:~Theconstkeyworddeclaresthatthefloatvariablepiwillnotbec