Exam11301Ch123Word文件下载.docx

Exam11301Ch123Word文件下载.docx

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System.out.println（4*number）;

intx=943;

System.out.println（x/100）;

System.out.println（x%100）;

System.out.println（x+"

is"

+（（x%2==0）?

"

even"

:

odd"

））;

inty=-1;

y++;

System.out.println（y）;

}

}

PartII:

1.（10pts）WriteaprogramthatpromptstheusertoentertheexchangeratefromcurrencyUSdollarstoChineseRMB.Prompttheusertoenter0toconvertfromUSdollarstoChineseRMBand1viceversa.PrompttheusertoentertheamountinUSdollarsorChineseRMBtoconvertittoChineseRMBorUSdollars,respectively.Herearethesampleruns:

<

Output>

EntertheexchangeratefromdollarstoRMB:

6.81

Enter0toconvertdollarstoRMBand1viceversa:

0

Enterthedollaramount:

100

$100.0is681.0Yuan

EndOutput>

1

EntertheRMBamount:

10000

10000.0Yuanis$1468.43

2.（10pts）Writeaprogramthatpromptstheusertoenteraninteger.Ifthenumberisamultipleof5,printHiFive.Ifthenumberisdivisibleby2or3,printGeorgia.Herearethesampleruns:

Enteraninteger:

6

Georgia

15

HiFiveGeorgia

25

HiFive

PartIII:

MultipleChoiceQuestions:

（1ptseach）

（Pleasecircleyouranswersonpaperfirst.Afteryoufinishthetest,enteryourchoicesonlinetoLiveLab.LoginandclickTakeInstructorAssignedQuiz.ChooseQuiz1.Youhave5minutestoenterandsubmittheanswers.）

1.Theexpression（int）（76.0252175*100）/100evaluatesto_________.

a.76

b.76.0252175

c.76.03

d.76.02

#

2.Whatisyafterthefollowingswitchstatement?

intx=0;

inty=0;

switch（x+1）{

case0:

y=0;

case1:

y=1;

default:

y=-1

a.2

b.1

c.0

d.-1

3.Assumexis0.Whatistheoutputofthefollowingstatement?

if（x>

0）

System.out.print（"

xisgreaterthan0"

）;

elseif（x<

xislessthan0"

else

xequals0"

a.xislessthan0

b.xisgreaterthan0

c.xequals0

d.None

4.Analyzethefollowingcode:

Code1:

booleaneven;

if（number%2==0）

even=true;

else

even=false;

Code2:

booleaneven=（number%2==0）;

a.Code2hassyntaxerrors.

b.Code1hassyntaxerrors.

c.BothCode1andCode2havesyntaxerrors.

d.BothCode1andCode2arecorrect,butCode2isbetter.

5.Whatistheprintoutofthefollowingswitchstatement?

charch='

a'

;

switch（ch）{

case'

:

A'

System.out.print（ch）;

break;

b'

B'

c'

C'

d'

D'

a.ab

b.a

c.aa

d.abc

e.abcd

6.Whatisxafterevaluating

x=（2>

3）?

2:

3;

a.5

b.2

c.3

d.4

7.Analyzethefollowingcode.

if（x>

0）;

{

System.out.println（"

x"

a.Thevalueofvariablexisalwaysprinted.

b.Thesymbolxisalwaysprintedtwice.

c.Thesymbolxisalwaysprinted.

d.Nothingisprintedbecausex>

0isfalse.

8.TodeclareaconstantMAX_LENGTHinsideamethodwithvalue99.98,youwrite

a.finaldoubleMAX_LENGTH=99.98;

b.doubleMAX_LENGTH=99.98;

c.finalMAX_LENGTH=99.98;

d.finalfloatMAX_LENGTH=99.98;

9.Whichofthefollowingisaconstant,accordingtoJavanamingconventions?

a.read

b.MAX_VALUE

c.ReadInt

d.Test

10.Whatisyafterthefollowingswitchstatementisexecuted?

x=3;

switch（x+3）{

case6:

case7:

y+=1;

a.1

b.4

d.2

e.0

11.Whichofthefollowingcodedisplaystheareaofacircleiftheradiusispositive.

a.if（radius<

=0）System.out.println（radius*radius*3.14159）;

b.if（radius!

c.if（radius>

d.if（radius>

0）System.out.println（radius*radius*3.14159）;

Solution:

PartI:

8.0

6

false

16

9

43

943isodd

1.

importjava.util.Scanner;

publicclassExercise3_31{

Scannerinput=newScanner（System.in）;

System.out.print（"

doublerate=input.nextDouble（）;

intconversionType=input.nextInt（）;

if（conversionType==0）{

doubledollars=input.nextDouble（）;

doubleRMB=dollars*rate;

$"

+dollars+"

+RMB+"

Yuan"

}

else{

doubleRMB=input.nextDouble（）;

doubledollars=RMB/rate;

System.out.println（RMB+"

+"

+dollars）;

2.

Scannerinput=newScanner（System.in）;

intnumber=input.nextInt（）;

if（number%5==0）

HiFive"

if（number%2==0||number%3==0）

Georgia"

Key:

a

d

c

b