chapter26e.docx
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chapter26e
TRUE/FALSE
1.Inthefollowingcodefragment,xhasthevalueof3.
intx=3;
ANSWER:
TRUE
2.Thebodyofado-whileloopalwaysexecutesatleastonce.
ANSWER:
TRUE
3.Thebodyofawhileloopmayneverexecute.
ANSWER:
TRUE
4.Theoppositeof（x>3&&x<10）is（x<3&&x>10）
ANSWER:
FALSE
5.Theinteger0isconsideredtrue.
ANSWER:
FALSE
6.Loopsareusedwhenweneedourprogramtomakeachoicebetweentwoormorethings.
ANSWER:
FALSE
7.Itislegaltodeclaremorethanonevariableinasinglestatement.
ANSWER:
TRUE
8.Variablenamesmaybeginwithanumber.
ANSWER:
FALSE
9.Theoppositeoflessthanisgreaterthan
ANSWER:
FALSE
10.Everylineinaprogramshouldhaveacomment.
ANSWER:
FALSE
ShortAnswer
1.<ANSWER:
insertion
2.Thebracesforaloopdefinethe____________oftheloop.
ANSWER:
body
3.Aloopthatalwaysexecutestheloopbodyatleastonceisknownasa_____________loop.
ANSWER:
do-while
4.intmyValue;iscalleda_______________________.
ANSWER:
variabledeclaration
5.Whatistheoppositeof（x<20&&x>12）?
_______________________
ANSWER:
（x>=20||x<=12）
6.Whatisthecorrectconditionalstatementtodetermineifxisbetween19and99?
__________________
ANSWER:
（x>19&&x<99）
7.Eachtimealoopbodyexecutesisknownasan_______________________.
ANSWER:
iteration
8.if-elsestatementsthatareinsideotherif-elsestatementsaresaidtobe_______________.
ANSWER:
nested
9.>>isknownasthe____________operator.
ANSWER:
extraction
10.Is<____________
ANSWER:
output
11.Thestreamthatisusedforinputfromthekeyboardiscalled___________.
ANSWER:
cin
12.Thestreamthatisusedforoutputtothescreeniscalled___________.
ANSWER:
cout
13.Writetheloopconditiontocontinueawhileloopaslongasxisnegative.____________________
ANSWER:
while（x<0）
14.Whenmustweusebracestodefinethebodyofacontitionalexpression?
______________
ANSWER:
Whentherearemultiplestatementsinthebody.
15.Inacompoundlogicaland（&&）expression,theevaluationoftheexpressionstopsonceoneofthetermsoftheexpressionisfalse.Thisisknownas______________evaluation.
ANSWER:
short-circuitevaluation
MultipleChoice
1.Whichofthefollowingisavalididentifier?
a.3com
b.three_com
c.3_com
d.3-com
e.dollar$
ANSWER:
C（shouldbeB）
2.Whichofthefollowingisnotavalididentifer?
a.return
b.myInt
c.myInteger
d.total3
ANSWER:
A
3.Whatisthevalueofxafterthefollowingstatements?
intx,y,z;
y=10;
z=3;
x=y*z+3;
a.Garbage
b.60
c.30
d.33
ANSWER:
D
4.Whatisthevalueofxafterthefollowingstatements?
intx;
x=0;
x=x+30;
a.0
b.30
c.33
d.garbage
ANSWER:
B
5.Whatisthevalueofxafterthefollowingstatements?
intx;
x=x+30;
a.0
b.30
c.33
d.garbage
ANSWER:
D
6.Whatistheoutputofthefollowingcode?
floatvalue;
value=33.5;
cout<a.33.5
b.33
c.value
d.garbage
ANSWER:
A
7.Whatistheoutputofthefollowingcode?
floatvalue;
value=33.5;
cout<<"value"<a.33.5
b.33
c.value
d.garbage
ANSWER:
C
8.Whatistheoutputofthefollowingcode?
cout<<"Thisisa\\"<a.Thisisa
b.Thisisa\
c.nothing,itisasyntaxerror
d.Thisisa\endl
ANSWER:
B
9.WhichofthefollowinglinescorrectlyreadsavaluefromthekeyboardandstoresitinthevariablenamedmyFloat?
a.cin>>myFloat;
b.cin<c.cin>>"myFloat";
d.cin>>myFloat>>endl;
ANSWER:
A
10.Anotherwaytowritethevalue3452211903is
a.3.452211903e09
b.3.452211903e-09
c.3.452211903x09
d.3452211903e09
ANSWER:
A
11.WhichofthefollowingstatementsisNOTlegal?
a.charch='b';
b.charch='0';
c.charch=65;
d.charch="cc";
ANSWER:
D
12.Whatisthevalueofxafterthefollowingstatements?
floatx;
x=15/4;
a.3.75
b.4.0
c.3.0
d.60
ANSWER:
C
13.Whatisthevalueofxafterthefollowingstatements?
intx;
x=15/4;
a.15
b.3
c.4
d.3.75
ANSWER:
B
14.Whatisthevalueofxafterthefollowingstatements?
intx;
x=15%4;
a.15
b.4
c.3
d.3.75
ANSWER:
C
15.Whatisthevalueofxafterthefollowingstatement?
floatx;
x=3.0/4.0+3+2/5
a.5.75
b.5.75
c.1.75
d.3.75
ANSWER:
D
16.Whatisthevalueofxafterthefollowingstatement?
floatx;
x=3.0/4.0+（3+2）/5
a.5.75
b.5.75
c.1.75
d.3.75
ANSWER:
C
17.Whatisthevalueofxafterthefollowingstatements?
doublex;
x=0;
x+=3.0*4.0;
x-=2.0;
a.22.0
b.12.0
c.10.0
d.14.0
ANSWER:
C
18.Giventhefollowingcodefragmentandtheinputvalueof4.0,whatoutputisgenerated?
floattax;
floattotal;
cout<<"enterthecostoftheitem\n";
cin>>total;
if（total>=3.0）
{
tax=0.10;
cout<}
else
{
cout<}
a.3
b.3.3
c.4.0
d.4.4
ANSWER:
D
19.Giventhefollowingcodefragmentandtheinputvalueof2.0,whatoutputisgenerated?
floattax;
floattotal;
cout<<"enterthecostoftheitem\n";
cin>>total;
if（total>=3.0）
{
tax=0.10;
cout<}
else
{
cout<}
a.2.2
b.2.0
c.3.1
d.4.4
ANSWER:
B
20.Ifxhasthevalueof3,yhasthevalueof-2,andwis10,isthefollowingconditiontrueorfalse?
if（x<2&&wa.true
b.false
ANSWER:
B
21.Whatisthecorrectwaytowritetheconditionya.（yb.（（yc.（（y>x）||（yd.（（yANSWER:
D
22.Giventhefollowingcodefragment,andaninputvalueof3,whatistheoutputthatisgenerated?
intx;
cout<<"Enteravalue\n";
cin>>x;
if（x=0）
{
cout<<"xiszero\n";
}
else
{
cout<<"xisnotzero\n";
}
a.xiszero
b.xisnotzero
c.unabletodetermine
d.xis3
ANSWER:
A（noteitisanassignment!
）
23.Giventhefollowingcodefragment,andaninputvalueof5,whatistheoutput?
intx;
if（x<3）
{
cout<<"small\n";
}
else
{
if（x<4）
{
cout<<"medium\n";
}
else
{
if（x<6）
{
cout<<"large\n";
}
else
{
cout<<"giant\n";
}
}
}
a.small
b.medium
c.large
d.giant
ANSWER:
C
24.Giventhefollowingcodefragment,whatistheoutput?
intx=5;
if（x>5）
cout<<"xisbiggerthan5.";
cout<<"Thatisall.";
cout<<"Goodbye\n";
a.xisbiggerthan5.Thatisall
b.xisbiggerthan5
c.Thatisall.Goodbye
d.Goodbye
ANSWER:
C
25.Executingoneormorestatementsoneormoretimesisknownas:
a.selection
b.iteration
c.sequence
d.algorithm
ANSWER:
B
26.Giventhefollowingcodefragment,whatisthefinalvalueofy?
intx,y;
x=-1;
y=0;
while（x<=3）
{
y+=2;
x+=1;
}
a.2
b.10
c.6
d.8
ANSWER:
B
27.Giventhefollowingcodefragment,whatisthefinalvalueofy?
intx,y;
x=-1;
y=0;
while（x<3）
{
y+=2;
x+=1;
}
a.2
b.10
c.6
d.8
ANSWER:
D
28.Whatistheoutputofthefollowingcodefragment?
intx=0;
while（x<5）
cout<x++;
cout<a.0
b.5
c.4
d.unabletodetermine
ANSWER:
D（infiniteloop）
29.Whatisthefinalvalueofxafterthefollowingfragmentofcodeexecutes?
intx=0;
do
{
x++;
}while（x>0）;
a.8
b.9
c.10
d.11
e.infiniteloop.
ANSWER:
E
30.Giventhefollowingcodefragment,whichofthefollowingexpressionsisalwaystrue?
intx;
cin>>x;
a.if（x<3）
b.if（x==1）
c.if（（x/3）>1）
d.if（x=1）
ANSWER:
D
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