C语言程序设计现代方法第二版习题答案CProgrammingAModernApproachnewWord下载.docx
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,j）;
Valueofk:
k）;
Valueofx:
%g\n"
x）;
Valueofy:
y）;
Valueofz:
z）;
WhencompiledusingGCCandthenexecuted,thisprogramproducedthefollowingoutput:
5618848
0
6844404
3.98979e-34
9.59105e-39
Thevaluesprinteddependonmanyfactors,sothechancethatyou'
llgetexactlythesenumbersissmall.
5.[was#10]（a）isnotlegalbecause100_bottlesbeginswithadigit.
8.[was#12]Thereare14tokens:
a,=,（,3,*,q,-,p,*,p,）,/,3,and;
.
AnswerstoSelectedProgrammingProjects
4.[was#8;
modified]
floatoriginal_amount,amount_with_tax;
Enteranamount:
"
）;
scanf（"
%f"
&
original_amount）;
amount_with_tax=original_amount*1.05f;
Withtaxadded:
$%.2f\n"
amount_with_tax）;
Theamount_with_taxvariableisunnecessary.Ifweremoveit,theprogramisslightlyshorter:
floatoriginal_amount;
original_amount*1.05f）;
Chapter3
2.[was#2]
（a）printf（"
%-8.1e"
（b）printf（"
%10.6e"
（c）printf（"
%-8.3f"
（d）printf（"
%6.0f"
5.[was#8]Thevaluesofx,i,andywillbe12.3,45,and.6,respectively.
1.[was#4;
modified]
intmonth,day,year;
Enteradate（mm/dd/yyyy）:
%d/%d/%d"
month,&
day,&
year）;
Youenteredthedate%d%.2d%.2d\n"
year,month,day）;
3.[was#6;
intprefix,group,publisher,item,check_digit;
EnterISBN:
%d-%d-%d-%d-%d"
prefix,&
group,&
publisher,&
item,&
check_digit）;
GS1prefix:
prefix）;
Groupidentifier:
group）;
Publishercode:
publisher）;
Itemnumber:
item）;
Checkdigit:
check_digit）;
/*Thefiveprintfcallscanbecombinedasfollows:
%d\nGroupidentifier:
%d\nPublishercode:
%d\nItemnumber:
%d\nCheckdigit:
prefix,group,publisher,item,check_digit）;
*/
Chapter4
2.[was#2]NotinC89.Supposethatiis9andjis7.Thevalueof（-i）/jcouldbeeither–1or–2,dependingontheimplementation.Ontheotherhand,thevalueof-（i/j）isalways–1,regardlessoftheimplementation.InC99,ontheotherhand,thevalueof（-i）/jmustbeequaltothevalueof-（i/j）.
9.[was#6]
（a）638
（b）321
（c）2-13
（d）000
13.[was#8]Theexpression++iisequivalentto（i+=1）.Thevalueofbothexpressionsisiaftertheincrementhasbeenperformed.
2.[was#4]
intn;
Enterathree-digitnumber:
%d"
n）;
Thereversalis:
%d%d%d\n"
n%10,（n/10）%10,n/100）;
Chapter5
（a）1
（b）1
（c）1
（d）1
4.[was#4]（i>
j）-（i<
j）
6.[was#12]Yes,thestatementislegal.Whennisequalto5,itdoesnothing,since5isnotequalto–9.
10.[was#16]Theoutputis
onetwo
sincetherearenobreakstatementsafterthecases.
2.[was#6]
inthours,minutes;
Entera24-hourtime:
%d:
hours,&
minutes）;
Equivalent12-hourtime:
if（hours==0）
12:
%.2dAM\n"
minutes）;
elseif（hours<
12）
hours,minutes）;
elseif（hours==12）
%.2dPM\n"
else
hours-12,minutes）;
intspeed;
Enterawindspeedinknots:
speed）;
if（speed<
1）
Calm\n"
elseif（speed<
=3）
Lightair\n"
=27）
Breeze\n"
=47）
Gale\n"
=63）
Storm\n"
Hurricane\n"
6.[was#10]
intcheck_digit,d,i1,i2,i3,i4,i5,j1,j2,j3,j4,j5,
first_sum,second_sum,total;
Enterthefirst（single）digit:
%1d"
d）;
Enterfirstgroupoffivedigits:
%1d%1d%1d%1d%1d"
i1,&
i2,&
i3,&
i4,&
i5）;
Entersecondgroupoffivedigits:
j1,&
j2,&
j3,&
j4,&
j5）;
Enterthelast（single）digit:
first_sum=d+i2+i4+j1+j3+j5;
second_sum=i1+i3+i5+j2+j4;
total=3*first_sum+second_sum;
if（check_digit==9-（（total-1）%10））
VALID\n"
NOTVALID\n"
10.[was#14]
intgrade;
Enternumericalgrade:
grade）;
if（grade<
0||grade>
100）{
Illegalgrade\n"
}
switch（grade/10）{
case10:
case9:
Lettergrade:
A\n"
break;
case8:
B\n"
case7:
C\n"
case6:
D\n"
case5:
case4:
case3:
case2:
case1:
case0:
F\n"
Chapter6
4.[was#10]（c）isnotequivalentto（a）and（b）,becauseiisincrementedbeforetheloopbodyisexecuted.
10.[was#12]Considerthefollowingwhileloop:
while（…）{
…
continue;
Theequivalentcodeusinggotowouldhavethefollowingappearance:
gotoloop_end;
loop_end:
;
/*nullstatement*/
12.[was#14]
for（d=2;
d*d<
=n;
d++）
if（n%d==0）
Theifstatementthatfollowstheloopwillneedtobemodifiedaswell:
if（d*d<
=n）
%disdivisibleby%d\n"
n,d）;
else
%disprime\n"
n）;
14.[was#16]Theproblemisthesemicolonattheendofthefirstline.Ifweremoveit,thestatementisnowcorrect:
if（n%2==0）
niseven\n"
intm,n,remainder;
Entertwointegers:
%d%d"
m,&
while（n!
=0）{
remainder=m%n;
m=n;
n=remainder;
Greatestcommondivisor:
m）;
4.[was#4]
floatcommission,value;
Entervalueoftrade:
value）;
while（value!
=0.0f）{
if（value<
2500.00f）
commission=30.00f+.017f*value;
elseif（value<
6250.00f）
commission=56.00f+.0066f*value;
20000.00f）
commission=76.00f+.0034f*value;
50000.00f）
commission=100.00f+.0022f*value;
500000.00f）
commission=155.00f+.0011f*value;
commission=255.00f+.0009f*value;
if（commission<
39.00f）
commission=39.00f;
Commission:
$%.2f\n\n"
commission）;
6.[was#6]
inti,n;
Enterlimitonmaximumsquare:
for（i=2;
i*i<
i+=2）
%d\n"
i*i）;
8.[was#8]
inti,n,start_day;
Enternumberofdaysinmonth:
Enterstartingdayoftheweek（1=Sun,7=Sat）:
start_day）;
/*printanyleading"
blankdates"
for（i=1;
i<
start_day;
i++）
"
/*nowprintthecalendar*/
i++）{
%3d"
if（（start_day+i-1）%7==0）
\n"
Chapter7
3.[was#4]（b）isnotlegal.
4.[was#6]（d）isillegal,sinceprintfrequiresastring,notacharacter,asitsfirstargument.
10.[was#14]unsignedint,becausethe（int）castappliesonlytoj,notj*k.
12.[was#16]Thevalueofiisconvertedtofloatandaddedtof,thentheresultisconvertedtodoubleandstoredind.
14.[was#18]No.Convertingftointwillfailifthevaluestoredinfexceedsthelargestvalueoftypeint.
1.[was#2]shortintvaluesareusuallystoredin16bits,causingfailureat182.intandlongintvaluesareusuallystoredin32bits,withfailureoccurringat46341.
2.[was#8]
charch;
Thisprogramprintsatableofsquares.\n"
Enternumberofentriesintable:
ch=getchar（）;
/*disposeofnew-l
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