Exam21301Ch4Word格式文档下载.docx
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Exam21301Ch4Word格式文档下载.docx
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inti;
booleanisPrime=true;
for(i=2;
i<
number&
&
isPrime;
i++){
if(number%i==0){
isPrime=false;
}
System.out.println("
iis"
+i);
if(isPrime)
System.out.println(number+"
isprime"
else
isnotprime"
}
(b)(2pts)
for(inti=0;
5;
i++)
System.out.print((i+4)+"
(c)(4pts)
inti=1;
while(i<
=4){
intnum=1;
for(intj=1;
j<
=i;
j++){
System.out.print(num+"
bb"
num*=3;
System.out.println();
i++;
PartII:
(8ptseach):
1.Writeacompleteprogramthatprintsnumbersfrom1to50,butifnumbersthataremultiplesof5,printHiFive,elseifnumbersthataredivisibleby2,printHiTwo,andelseifnumbersthataredivisibleby3or7,printHiThreeOrSeven.
2.Writealoopthatcomputes(Noneedtowriteacompleteprogram)
PartIII:
MultipleChoiceQuestions:
(1ptseach)
(1.Markyouranswersonthesheet.2.LoginandclickTakeInstructorAssignedQuizforQuiz2.3.Submititonlinewithin5mins.4.ClosetheInternetbrowser.)
1
Whatistheoutputfory?
inty=0;
for(inti=0;
i<
10;
++i){
y+=i;
System.out.println(y);
a.45
b.11
c.13
d.12
e.10
#
2
Analyzethefollowingcode.
intx=1;
while(0<
x)&
(x<
100)
System.out.println(x++);
a.Thelooprunsforever.
b.Thecodedoesnotcompilebecausetheloopbodyisnotinthebraces.
c.Thecodedoesnotcompilebecause(0<
100)isnotenclosedinapairofparentheses.
d.Thenumbers1to99aredisplayed.
e.Thenumbers2to100aredisplayed.
3
Howmanytimeswillthefollowingcodeprint"
WelcometoJava"
?
intcount=0;
do{
count++;
}while(count<
10);
A.8
B.0
C.11
D.10
E.9
4
Whatisiafterthefollowingforloopisfinished?
A.10
B.undefined
C.9
D.11
5
Analyzethefollowingcode:
publicclassTest{
publicstaticvoidmain(Stringargs[]){
inti=0;
for(i=0;
10;
i++);
System.out.println(i+4);
}
A.Theprogramcompilesdespitethesemicolon(;
)ontheforloopline,anddisplays4.
B.Theprogramcompilesdespitethesemicolon(;
)ontheforloopline,anddisplays14.
C.Theprogramhasacompileerrorbecauseofthesemicolon(;
)ontheforloopline.
D.Theprogramhasaruntimeerrorbecauseofthesemicolon(;
6
Whichofthefollowingexpressionyieldsanintegerbetween0and100,inclusive?
A.(int)(Math.random()*100+1)
B.(int)(Math.random()*101)
C.(int)(Math.random()*100)
D.(int)(Math.random()*100)+1
7
while(count<
100){
//PointA
WelcometoJava!
"
//PointB
//PointC
A.count<
100isalwaysfalseatPointA
B.count<
100isalwaystrueatPointB
C.count<
100isalwaysfalseatPointC
D.count<
100isalwaystrueatPointC
E.count<
100isalwaysfalseatPointB
8.Whatistheoutputofthefollowingfragment?
inti=1;
intj=1;
while(i<
5){
j=j*2;
System.out.println(j);
a.4
b.8
c.16
d.32
e.64
Solution:
PartI.
(a)
iis4
9isnotprime
(b)
45678
(c)
1bb
1bb3bb
1bb3bb9bb
1bb3bb9bb27bb
(a)
publicstaticvoidmain(String[]args){
for(inti=1;
=50;
if(i%5==0)
HiFive"
elseif(i%2==0)
HiTwo"
elseif(i%3==0||i%7==0)
HiThreeOrSeven"
System.out.println(i+"
(b)
/**Mainmethod*/
doublesum=0;
=99;
sum+=(i*1.0/(i+1));
//Displayresults
Sumis"
+sum);
1.
Key:
a
2.
c
3.
d
4.
b
5.
6.
7.
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