德尔福笔试软件类docWord文档下载推荐.docx

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3.Whatarethevaluesofa,b,andcafterthefollowinginstructions:

inta=5,b=7,c;

c=a+++b;

4,Whatdothefollowingdeclarationsmean?

a）constinta;

b）intconsta;

c）constint*a;

d）int*consta;

e）intconst*aconst;

5.Whichofthefollowingstatementsdescribetheuseofthekeyword　static?

a）Withinthebodyofafunction:

Astaticvariablemaintainsitsvalue　betweenfunctionrevocations

b）Withinamodule:

Astaticvariableisaccessiblebyallfunctions　withinthatmodule

c）Withinamodule:

Astaticfunctioncanonlybecalledbyother　functionswithinthatmodule

6.Embeddedsystemsalwaysrequiretheusertomanipulatebitsin　registersorvariables.Givenanintegervariablea,writetwocodefragments.

Thefirstshouldsetbit5ofa.Thesecondshnuldclearbit5ofa.Inboth　cases,the　remainingbitsshouldbeunmodified.

7.Whatdoesthefollowingfunctionreturn?

charfoo（void）

{

unsignedinta=6;

ihtb=-20;

charc;

（a+b>

6）?

（c=1）:

（c=0）;

returnc;

}

8.WhatvaluesareprintedwhenthefollowingCprogramisexecuted?

inti=8;

voidmain（void）

（

9.WhatwillbetheoutputofthefollowingCcode?

main（）

intk,num=30;

k=（num>

5?

（num<

=10?

100:

200）:

500）;

printf（"

%d"

k）;

10.WhatwillthefollowingCcodedo?

int*ptr;

ptr=（int*）Ox67a9;

ptr=Oxaa55;

11.WhatwillbetheoutputofthefollowCcode?

defineproduct（x）（x*x）main（）

inti=3,j,k;

j=product（i++）;

k=product（++i）;

%d%d"

j,k）;

.SimplifythefollowingBooleanexpression!

（（i==）||（j>

15））

13.Howmanyflip-flopcircuitsareneededtodivideby16?

14.Provides3propertiesthatmakeanOS,aRTOS?

15.Whatispre-emption?

16.AssumetheBCregistervalueis8538H,andtheDEregister　valueis62A5H.FindthevalueofregisterBCafterthefollowing　assemblyoperations:

MOVA,C

SUBE

MOVC,A

MOVA,B

SBBD

MOVB,A

17.IntheAssemblycodeshownbelow

LOOP:

MVIC,78H

DCRC

JNZLOOP

HLT

HowmanytimesistheDCRCOperationexecuted?

18.Describethemostefficientway（intermofexecutiontime　andcodesize）todivideanumberby4inassemblylanguage

2020-01-04

b）Withinamodule:

18.Describethemostefficientway（intermofexecutiontime　andcodesize）todivideanumberby4inassem