Exam11301Ch123.docx
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Exam11301Ch123
Name:
_______________________
CoversChapters1-3
50mins
CSCI1301IntroductiontoProgramming
ArmstrongAtlanticStateUniversity
Instructor:
Y.DanielLiang
PartI.（10pts）Showtheprintoutofthefollowingcode:
（writetheprintoutnexttoeachprintlnstatementiftheprintlnstatementisexecutedintheprogram）.
publicclassTest{
publicstaticvoidmain（String[]args）{
System.out.println（（int）（Math.random（）））;
System.out.println（Math.pow（2,3））;
System.out.println（34%7）;
System.out.println（3+4*2>2*9）;
intnumber=4;
if（number%3==0）
System.out.println（3*number）;
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:
EntertheexchangeratefromdollarstoRMB:
6.81
Enter0toconvertdollarstoRMBand1viceversa:
0
Enterthedollaramount:
100
$100.0is681.0Yuan
EntertheexchangeratefromdollarstoRMB:
6.81
Enter0toconvertdollarstoRMBand1viceversa:
1
EntertheRMBamount:
10000
10000.0Yuanis$1468.43
2.（10pts）Writeaprogramthatpromptstheusertoenteraninteger.Ifthenumberisamultipleof5,printHiFive.Ifthenumberisdivisibleby2or3,printGeorgia.Herearethesampleruns:
Enteraninteger:
6
Georgia
Enteraninteger:
15
HiFiveGeorgia
Enteraninteger:
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<0）
System.out.print（"xislessthan0"）;
else
System.out.print（"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':
case'A':
System.out.print（ch）;break;
case'b':
case'B':
System.out.print（ch）;break;
case'c':
case'C':
System.out.print（ch）;break;
case'd':
case'D':
System.out.print（ch）;
}
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.
intx=0;
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:
y=0;
case7:
y=1;
default:
y+=1;
}
a.1
b.4
c.3
d.2
e.0
#
11.Whichofthefollowingcodedisplaystheareaofacircleiftheradiusispositive.
a.if（radius<=0）System.out.println（radius*radius*3.14159）;
b.if（radius!
=0）System.out.println（radius*radius*3.14159）;
c.if（radius>=0）System.out.println（radius*radius*3.14159）;
d.if（radius>0）System.out.println（radius*radius*3.14159）;
Solution:
PartI:
0
8.0
6
false
16
9
43
943isodd
0
PartII:
1.
importjava.util.Scanner;
publicclassExercise3_31{
publicstaticvoidmain（String[]args）{
Scannerinput=newScanner（System.in）;
System.out.print（"EntertheexchangeratefromdollarstoRMB:
"）;
doublerate=input.nextDouble（）;
System.out.print（"Enter0toconvertdollarstoRMBand1viceversa:
"）;
intconversionType=input.nextInt（）;
if（conversionType==0）{
System.out.print（"Enterthedollaramount:
"）;
doubledollars=input.nextDouble（）;
doubleRMB=dollars*rate;
System.out.println（"$"+dollars+"is"+RMB+"Yuan"）;
}
else{
System.out.print（"EntertheRMBamount:
"）;
doubleRMB=input.nextDouble（）;
doubledollars=RMB/rate;
System.out.println（RMB+"Yuan"+"is"+"$"+dollars）;
}
}
}
2.
importjava.util.Scanner;
publicclassTest{
publicstaticvoidmain（String[]args）{
Scannerinput=newScanner（System.in）;
System.out.println（"Enteraninteger:
"）;
intnumber=input.nextInt（）;
if（number%5==0）
System.out.println（"HiFive"）;
if（number%2==0||number%3==0）
System.out.println（"Georgia"）;
}
}
PartIII:
1.Theexpression（int）（76.0252175*100）/100evaluatesto_________.
a.76
b.76.0252175
c.76.03
d.76.02
Key:
a
#
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
Key:
d
#
3.Assumexis0.Whatistheoutputofthefollowingstatement?
if（x>0）
System.out.print（"xisgreaterthan0"）;
elseif（x<0）
System.out.print（"xislessthan0"）;
else
System.out.print（"xequals0"）;
a.xislessthan0
b.xisgreaterthan0
c.xequals0
d.None
Key:
c
#
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.
Key:
d
#
5.Whatistheprintoutofthefollowingswitchstatement?
charch='a';
switch（ch）{
case'a':
case'A':
System.out.print（ch）;break;
case'b':
case'B':
System.out.print（ch）;break;
case'c':
case'C':
System.out.print（ch）;break;
case'd':
case'D':
System.out.print（ch）;
}
a.ab
b.a
c.aa
d.abc
e.abcd
Key:
b
#
6.Whatisxafterevaluating
x=（2>3）?
2:
3;
a.5
b.2
c.3
d.4
Key:
c
#
7.Analyzethefollowingcode.
intx=0;
if（x>0）;
{
System.out.println（"x"）;
}
a.Thevalueofvariablexisalwaysprinted.
b.Thesymbolxisalwaysprintedtwice.
c.Thesymbolxisalwaysprinted.
d.Nothingisprintedbecausex>0isfalse.
Key:
c
#
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;
Key:
a
#
9.Whichofthefollowingisaconstant,accordingtoJavanamingconventions?
a.read
b.MAX_VALUE
c.ReadInt
d.Test
Key:
b
#
10.Whatisyafterthefollowingswitchstatementisexecuted?
x=3;
switch（x+3）{
case6:
y=0;
case7:
y=1;
default:
y+=1;
}
a.1
b.4
c.3
d.2
e.0
Key:
d
#
11.Whichofthefollowingcodedisplaystheareaofacircleiftheradiusispositive.
a.if（radius<=0）System.out.println（radius*radius*3.14159）;
b.if（radius!
=0）System.out.println（radius*radius*3.14159）;
c.if（radius>=0）System.out.println（radius*radius*3.14159）;
d.if（radius>0）System.out.println（radius*radius*3.14159）;
Key:
d
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