深入理解计算机系统 第二版 课后习题答案 pdf.pdf

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1、ComputerSystems:AProgrammer'sPerspectiveInstructor'sSolutionManual1RandalE.BryantDavidR.O'HallaronDecember4,20031Copyrightc2003,R.E.Bryant,D.R.O'Hallaron.Allrightsreserved.2Chapter1SolutionstoHomeworkProblemsThetextusestwodifferentkindsofexercises:PracticeProblems.Theseareproblems

2、thatareincorporateddirectlyintothetext,withexplanatorysolutionsattheendofeachchapter.Ourintentionisthatstudentswillworkontheseproblemsastheyreadthebook.Eachonehighlightssomeparticularconcept.HomeworkProblems.Thesearefoundattheendofeachchapter.Theyvaryincomplexityfromsimpledrillstom

3、ulti-weeklabsandaredesignedforinstructorstogiveasassignmentsortouseasrecitationexamples.Thisdocumentgivesthesolutionstothehomeworkproblems.1.1Chapter1:ATourofComputerSystems1.2Chapter2:RepresentingandManipulatingInformationProblem2.40Solution:Thisexerciseshouldbeastraightforwardvari

4、ationontheexistingcode.code/data/show-ans.c1voidshow_short(shortintx)2{3show_bytes((byte_pointer)&x,sizeof(shortint));4}56voidshow_long(longintx)7{8show_bytes((byte_pointer)&x,sizeof(long));9}12CHAPTER1.SOLUTIONSTOHOMEWORKPROBLEMS1011voidshow_double(doublex)12{13show_bytes((byte_poi

5、nter)&x,sizeof(double));14}code/data/show-ans.cProblem2.41Solution:Therearemanywaystosolvethisproblem.Thebasicideaistocreatesomemultibytedatumwithdifferentvaluesforthemostandleast-significantbytes.Wethenreadbyte0anddeterminewhichbyteitis.Inthefollowingsolutionistocreateanintwithvalue

6、1.Wethenaccessitsfirstbyteandconvertittoanint.Thisbytewillequal0onabig-endianmachineand1onalittle-endianmachine.code/data/show-ans.c1intis_little_endian(void)2{3/*MSB=0,LSB=1*/4intx=1;56/*ReturnMSBwhenbig-endian,LSBwhenlittle-endian*/7return(int)(*(char*)&x);8}code/data/show-ans.cPro

7、blem2.42Solution:Thisisasimpleexerciseinmaskingandbitmanipulation.Itisimportanttomentionthat˜0xFFisawaytogenerateamaskthatselectsallbuttheleastsignificantbytethatworksforanywordsize.(x&0xFF)

8、(y&˜0xFF)Problem2.43Solution:Theseexercisesrequirethinkingaboutthelogicaloperation!inanontrad

9、itionalway.Normally