C PRIMER PLUS 第七八正确答案Word文档下载推荐.docx
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\n"
return0;
}
PE7-2
intcount=0;
inuputastring,andthisprogramwilloutitandASCII\n（#toquit）...\n"
if（ch=='
）{
printf（"
\ninputanotherstring（#toquit）:
\n"
continue;
}
while（count==8）{
count=0;
printf（"
%c,%d"
ch,ch）;
count++;
\nBye!
PE7-3
intmain（void）
intn;
doublesumeven=0.0;
intct_even=0;
doublesumodd=0.0;
intct_odd=0;
while（scanf（"
%d"
&
n）==1&
&
n!
=0）
if（n%2==1）
sumodd+=n;
++ct_odd;
else
sumeven+=n;
++ct_even;
Numberofevens:
%d"
ct_even）;
if（ct_even>
0）
average:
%g"
sumeven/ct_even）;
putchar（'
Numberofodds:
ct_odd）;
if（ct_odd>
sumodd/ct_odd）;
\ndone\n"
PE7-4
intex_c,pe_c;
ex_c=pe_c=0;
inuputastring,andthisprogramwillswitch.to!
and!
to!
!
\n（#toquit）...\n"
.'
"
pe_c++;
elseif（ch=='
'
ex_c++;
%c"
ch）;
\nthereare%dpeswitchingand%dexswitching"
pe_c,ex_c）;
PE7-5
intct1=0;
intct2=0;
switch（ch）
case'
:
++ct1;
break;
++ct2;
default:
putchar（ch）;
%dreplacementsof.with!
ct1）;
%dreplacementsof!
with!
ct2）;
PE7-6
intmain（void）{
inte_c,i_c,st_c;
e_c=i_c=st_c=0;
inputyourstringandthisprogramwilloutputthecount\n（#toquit）:
while（（ch=getchar（））!
）{//当输入ei时st_c=10,i_c=10
if（ch!
i'
）{//当输入ie时st_c=10,i_c=1,输入其他字符st_c=2
st_c=2;
if（ch=='
e'
st_c=10;
i_c=1;
}
i_c=10;
if（st_c==i_c）{//防止eii的bug
e_c++;
st_c=1;
\nthereis%deiinyourstring!
\nbye!
e_c）;
PE7-7
#defineBASEPAY10/*$10perhour*/
#defineBASEHRS40/*hoursatbasepay*/
#defineOVERTIME1.5/*1.5time*/
#defineAMT1300/*1stratetier*/
#defineAMT2150/*2stratetier*/
#defineRATE10.15/*ratefor1sttier*/
#defineRATE20.20/*ratefor2ndtier*/
#defineRATE30.25/*ratefor3rdtier*/
doublehours;
doublegross;
doublenet;
doubletaxes;
Enterthenumberofhoursworkedthisweek:
"
scanf（"
%lf"
hours）;
if（hours<
=BASEHRS）
gross=hours*BASEPAY;
gross=BASEHRS*BASEPAY+（hours-BASEHRS）*BASEPAY*OVERTIME;
if（gross<
=AMT1）
taxes=gross*RATE1;
elseif（gross<
=AMT1+AMT2）
taxes=AMT1*RATE1+（gross-AMT1）*RATE2;
taxes=AMT1*RATE1+AMT2*RATE2+（gross-AMT1-AMT2）*RATE3;
net=gross-taxes;
gross:
$%.2f;
taxes:
net:
$%.2f\n"
gross,taxes,net）;
PE7-8
ctype.h>
intmain（void）{
intchoose;
inttest=1;
*****************************************************************\n"
Enterthenumbercorrespondingtothedesiredpayrateoraction:
1）$8.75/hr\t\t2）$9.33/hr\n3）$10.00/hr\t\t4）$11.20/hr\n5）quit\n"
while（（scanf（"
&
choose））==1）{
switch（choose）{
case1:
hours=8.75;
break;
case2:
hours=9.33;
case3:
hours=10.00;
case4:
hours=11.20;
case5:
test=0;
default:
test=2;
printf（"
error!
tryagain:
if（test==2）{
test=1;
if（test==1）{
if（hours<
gross=hours*BASEPAY;
else
gross=BASEHRS*BASEPAY+（hours-BASEHRS）*BASEPAY*OVERTIME;
if（gross<
taxes=gross*RATE1;
elseif（gross<
taxes=AMT1*RATE1+（gross-AMT1）*RATE2;
taxes=AMT1*RATE1+AMT2*RATE2+（gross-AMT1-AMT2）*RATE3;
net=gross-taxes;
$%.2f\nnext:
}
elseif（test==0）{
break;
}
return0;
PE7-9
#defineNO0
#defineYES1
longnum;
/*valuetobechecked*/
longdiv;
/*potentialdivisors*/
longlim;
/*limittovalues*/
intprime;
Pleaseenterlimittovaluestobechecked;
Enterqtoquit.\n"
%ld"
lim）==1&
lim>
for（num=2;
num<
=lim;
num++）
{
for（div=2,prime=YES;
（div*div）<
=num;
div++）
if（num%div==0）
prime=NO;
/*numberisnotprime*/
if（prime==YES）
%ldisprime.\n"
num）;
Pleaseenteranotherlimit;
PE7-11
constdoubleprice_artichokes=1.25;
constdoubleprice_beets=0.65;
constdoubleprice_carrots=0.89;
constdoubleDISCOUNT_RATE=0.05;
doublelb_artichokes;
doublelb_beets;
doublelb_carrots;
doublelb_total;
doublecost_artichokes;
doublecost_beets;
doublecost_carrots;
doublecost_total;
doublefinal_total;
doublediscount;
doubleshipping;
Enteratobuyartichokes,bforbeets,"
cforcarrots,qtoquit:
q'
&
ch!
Q'
if（ch=='
continue;
while（getchar（）!
ch=tolower（ch）;
switch（ch）
a'
Enterpoundsofartichokes:
lb_artichokes）;
b'
Enterpoundsofbeets:
lb_beets）;
c'
Enterpoundsofcarrots:
lb_carrots）;
%cisnotavalidchoice.\n"
cost_artichokes=price_artichokes*lb_artichokes;
cost_beets=price_beets*lb_beets;
cost_carrots=price_carrots*lb_carrots;
cost_total=cost_artichokes+cost_beets+cost_carrots;
lb_total=lb_artichokes+lb_beets+lb_carrots;
if（lb_total<
shipping=0.0;
elseif（lb_total<
5.0）
shipping=3.50;
20）
shipping=10.0;
shipping=8.0+0.1*lb_total;
if（cost_total>
100.0）
discount=DISCOUNT_RATE*cost_total;
discount=0.0;
final_total=cost_total+shipping-discount;
Yourorder:
%.2flbsofartichokesat$%.2fperpound:
$%.2f\n"
lb_artichokes,price_artichokes,cost_artichokes）;
%.2flbsofbeetsat$%.2fperpound:
lb_beets,price_beets,cost_beets）;
%.2flbsofcarrotsat$%.2fperpound:
lb_carrots,price_carrots,cost_carrots）;
Totalcostofvegetables:
cost_total）;
100）
Volumediscount:
discount）;
Shipping:
shipping）;
Totalcharges:
final_total）;
Chapter8
PE8-1
//Ctrl+z结束文件
intch;
intct=0;
=EOF）
ct++;
%dcharactersread\n"
ct）;
PE8-3
/*ProgrammingExercise8-3*/
/*Usingctype.heliminatesneedtoassumeASCIIcoding*/
intuct=0;
intlct=0;
if（isupper（ch））
uct++;
elseif（islower（ch））
lct++;
%duppercasecharactersread\n"
uct）;
%dlowercasecharactersread\n"
lct）;
/*
oryoucoulduse
if（ch>
A'
ch<
Z'
elseif（ch>
z'
*/
PE8-5
/*ProgrammingExercise8-5*/
/*binaryguess.c--animprovednumber-guesser*/
inthigh=100;
intlow=1;
intguess=（high+low）/2;
charresponse;
Pickanintegerfrom1to100.Iwilltrytoguess"
it.\nRespondwithayifmyguessisright,with"
\nahifitishigh,andwithanlifitislow.\n"
Uh...isyournumber
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