深入理解 C &ampamp; C _Olve Maudal &ampamp; Jon Jagger.pdf

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1、DeepC(andC++)byOlveMaudalandJonJaggerhttp://www.noaanews.noaa.gov/stories2005/images/rov-hercules-titanic.jpgProgrammingishard.ProgrammingcorrectCandC++isparticularlyhard.Indeed,bothinCandcertainlyinC++,itisuncommontoseeascreenfulcontainingonlywelldefinedandconformingcode.Whydoprofess

2、ionalprogrammerswritecodelikethis?Becausemostprogrammersdonothaveadeepunderstandingofthelanguagetheyareusing.Whiletheysometimesknowthatcertainthingsareundefinedorunspecified,theyoftendonotknowwhyitisso.IntheseslideswewillstudysmallcodesnippetsinCandC++,andusethemtodiscussthefundamental

3、buildingblocks,limitationsandunderlyingdesignphilosophiesofthesewonderfulbutdangerousprogramminglanguages.October2011SupposeyouareabouttointerviewacandidateforapositionasCprogrammerforvariousembeddedplatforms.Aspartoftheinterviewyoumightwanttocheckwhetherthecandidatehasadeepunderstan

4、dingoftheprogramminglanguageornot...hereisagreatcodesnippettogettheconversationstarted:SupposeyouareabouttointerviewacandidateforapositionasCprogrammerforvariousembeddedplatforms.Aspartoftheinterviewyoumightwanttocheckwhetherthecandidatehasadeepunderstandingoftheprogramminglanguageor

5、not...hereisagreatcodesnippettogettheconversationstarted:intmain(){inta=42;printf(“%d”,a);}SupposeyouareabouttointerviewacandidateforapositionasCprogrammerforvariousembeddedplatforms.Aspartoftheinterviewyoumightwanttocheckwhetherthecandidatehasadeepunderstandingoftheprogramminglang

6、uageornot...hereisagreatcodesnippettogettheconversationstarted:intmain(){inta=42;printf(“%d”,a);}Whatwillhappenifyoutrytocompile,linkandrunthisprogram?Whatwillhappenifyoutrytocompile,linkandrunthisprogram?intmain(){inta=42;printf(“%d”,a);}Whatwillhappenifyoutrytocompile,linkandru

7、nthisprogram?intmain(){inta=42;printf(“%d”,a);}Onecandidatemightsay:Whatwillhappenifyoutrytocompile,linkandrunthisprogram?intmain(){inta=42;printf(“%d”,a);}Youmust#include,addOnecandidatemightsay:areturn0andthenitwillcompileandlink.Whenexecuteditwillprintthevalue42onthes

8、creen.Whatwi