C++PrimerPlus第五版习题解答.docx
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C++PrimerPlus第五版习题解答
Chapter2
//pe2-2.cpp
#include
intmain（void）
{
usingnamespacestd;
cout<<"Enteradistanceinfurlongs:
";
doublefurlongs;
cin>>furlongs;
doublefeet;
feet=220*furlongs;
cout<<return0;
}
//pe2-3.cpp
#include
usingnamespacestd;
voidmice（）;
voidrun（）;
intmain（）
{
mice（）;
mice（）;
run（）;
run（）;
return0;
}
voidmice（）
{
cout<<"Threeblindmice\n";
}
voidrun（）
{
cout<<"Seehowtheyrun\n";
}
//pe2-4.cpp
#include
doubleC_to_F（double）;
intmain（）
{
usingnamespacestd;
cout<<"EnteratemperatureinCelsius:
";
doubleC;
cin>>C;
doubleF;
F=C_to_F（C）;
cout<<return0;
}
doubleC_to_F（doubletemp）
{
return1.8*temp+32.0;
}
Chapter3
//pe3-1.cpp
#include
constintInch_Per_Foot=12;
intmain（void）
{
usingnamespacestd;
//Note:
someenvironmentsdon'tsupportthebackspacecharacter
cout<<"Pleaseenteryourheightininches:
___/b/b/b";
intht_inch;
cin>>ht_inch;
intht_feet=ht_inch/Inch_Per_Foot;
intrm_inch=ht_inch%Inch_Per_Foot;
cout<<"Yourheightis"<cout<return0;
}
//pe3-3.cpp
#include
constdoubleMINS_PER_DEG=60.0;
constdoubleSECS_PER_MIN=60.0;
intmain（）
{
usingnamespacestd;
intdegrees;
intminutes;
intseconds;
doublelatitude;
cout<<"Enteralatitudeindegrees,minutes,andseconds:
\n";
cout<<"First,enterthedegrees:
";
cin>>degrees;
cout<<"Next,entertheminutesofarc:
";
cin>>minutes;
cout<<"Finally,enterthesecondsofarc:
";
cin>>seconds;
latitude=degrees+（minutes+seconds/SECS_PER_MIN）/MINS_PER_DEG;
cout<<return0;
}
//pe3-5.cpp
#include
intmain（void）
{
usingnamespacestd;
cout<<"Howmanymileshaveyoudrivenyourcar?
";
floatmiles;
cin>>miles;
cout<<"Howmanygallonsofgasolinedidthecaruse?
";
floatgallons;
cin>>gallons;
cout<<"Yourcargot"<cout<<"milespergallon.\n";
return0;
}
//pe3-6.cpp
#include
constdoubleKM100_TO_MILES=62.14;
constdoubleLITERS_PER_GALLON=3.875;
intmain（void）
{
usingnamespacestd;
doubleeuro_rating;
doubleus_rating;
cout<<"Enterfuelconsumptioninlitersper100km:
";
cin>>euro_rating;
//dividebyLITER_PER_GALLONtogetgallonsper100-km
//dividebyKM100_TO_MILEStogetgallonspermile
//invertresulttogetmilespergallon
us_rating=（LITERS_PER_GALLON*KM100_TO_MILES）/euro_rating;
cout<cout<return0;
}
Chapter4
//pe4-2.cpp--storingstringsinstringobjects
#include
#include
intmain（）
{
usingnamespacestd;
stringname;
stringdessert;
cout<<"Enteryourname:
\n";
getline（cin,name）;//readsthroughnewline
cout<<"Enteryourfavoritedessert:
\n";
getline（cin,dessert）;
cout<<"Ihavesomedelicious"<cout<<"foryou,"<return0;
}
//pe4-3.cpp--storingstringsinchararrays
#include
#include
constintSIZE=20;
intmain（）
{
usingnamespacestd;
charfirstName[SIZE];
charlastName[SIZE];
charfullName[2*SIZE+1];
cout<<"Enteryourfirstname:
";
cin>>firstName;
cout<<"Enteryourlastname:
";
cin>>lastName;
strncpy（fullName,lastName,SIZE）;
strcat（fullName,","）;
strncat（fullName,firstName,SIZE）;
fullName[SIZE-1]='\0';
cout<<"Here'stheinformationinasinglestring:
"
<return0;
}
//pe4-5.cpp
//acandybarstructure
structCandyBar{
charbrand[40];
doubleweight;
intcalories;
};
#include
intmain（）
{
usingnamespacestd;//introducesnamespacestd
CandyBarsnack={"MochaMunch",2.3,350};
cout<<"Brandname:
"<cout<<"Weight:
"<cout<<"Calories:
"<return0;
}
//pe4-7.ccp
#include
constintSlen=70;
structpizza{
charname[Slen];
floatdiameter;
floatweight;
};
intmain（void）
{
usingnamespacestd;
pizzapie;
cout<<"Whatisthenameofthepizzacompany?
";
cin.getline（pie.name,Slen）;
cout<<"Whatisthediameterofthepizzaininches?
";
cin>>pie.diameter;
cout<<"Howmuchdoesthepizzaweighinounces?
";
cin>>pie.weight;
cout<<"Company:
"<cout<<"Diameter:
"<cout<<"Weight:
"<return0;
}
Chapter5
//pe5-2.cpp
#include
intmain（void）
{
usingnamespacestd;
doublesum=0.0;
doublein;
cout<<"Enteranumber（0toterminate）:
";
cin>>in;
while（in!
=0）{
sum+=in;
cout<<"Runningtotal="<cout<<"Enternextnumber（0toterminate）:
";
cin>>in;
}
cout<<"Bye!
\n";
return0;
}
//pe5-4.cpp
//booksales
#include
constintMONTHS=12;
constchar*months[MONTHS]={"January","February","March","April",
"May","June","July","August","September",
"October","November","December"};
intmain（）
{
usingnamespacestd;//introducesnamespacestd
intsales[MONTHS];
intmonth;
cout<<"Enterthemonthlysalesfor\"C++forFools\":
\n";
for（month=0;month{
cout<<"Salesfor"<";
cin>>sales[month];
}
doubletotal=0.0;
for（month=0;monthtotal+=sales[month];
cout<<"Totalsales:
"<return0;
}
//pe5-6.cpp
#include
structcar{charname[20];intyear;};
intmain（void）
{
usingnamespacestd;
intn;
cout<<"Howmanycarsdoyouwishtocatalog?
:
";
cin>>n;
while（cin.get（）!
='\n'）//getridofrestofline
;
car*pc=newcar[n];
inti;
for（i=0;i{
cout<<"Car#"<<（i+1）<<":
\n";
cout<<"Pleaseenterthemake:
";
cin.getline（pc[i].name,20）;
cout<<"Pleaseentertheyearmade:
";
cin>>pc[i].year;
while（cin.get（）!
='\n'）//getridofrestofline
;
}
cout<<"Hereisyourcollection:
\n";
for（i=0;icout<delete[]pc;
return0;
}
//pe5-7.cpp--countwordsusingC-stylestring
#include
#include//prototypeforstrcmp（）
constintSTR_LIM=50;
intmain（）
{
usingnamespacestd;
charword[STR_LIM];
intcount=0;
cout<<"Enterwords（tostop,typetheworddone）:
\n";
while（cin>>word&&strcmp（"done",word））
++count;
cout<<"Youenteredatotalof"<return0;
}
//pe5-9.cpp
//nestedloops
#include
intmain（）
{
usingnamespacestd;//introducesnamespacestd
introws;
introw;
intcol;
intperiods;
cout<<"Enternumberofrows:
";
cin>>rows;
for（row=1;row<=rows;row++）
{
periods=rows-row;
for（col=1;col<=periods;col++）
cout<<'.';
//colalreadyhascorrectvaluefornextloop
for（;col<=rows;col++）
cout<<'*';
cout<}
return0;
}
Chapter6
//pe6-1.cpp
#include
#include
intmain（）
{
usingnamespacestd;//introducesnamespacestd
charch;
cin.get（ch）;
while（ch!
='@'）
{
if（!
isdigit（ch））
{
if（isupper（ch））
ch=tolower（ch）;
elseif（islower（ch））
ch=toupper（ch）;
cout<}
cin.get（ch）;
}
return0;
}
//pe6-3.cpp
#include
intmain（void）
{
usingnamespacestd;
cout<<"Pleaseenteroneofthefollowingchoices:
\n";
cout<<"c）carnivorep）pianist\n"
<<"t）treeg）game\n";
charch;
cin>>ch;
while（ch!
='c'&&ch!
='p'&&ch!
='t'&&ch!
='g'）
{
cout<<"Pleaseenterac,p,t,org:
";
cin>>ch;
}
switch（ch）
{
case'c':
cout<<"Acatisacarnivore.\n";
break;
case'p':
cout<<"RaduLupuisapianist.\n";
break;
case't':
cout<<"Amapleisatree.\n";
break;
case'g':
cout<<"Golfisagame.\n";
break;
default:
cout<<"Theprogramshouldn'tgethere!
\n";
}
return0;
}
//pe6-5.cpp
//Neutroniataxation
#include
constdoubleLEV1=5000;
constdoubleLEV2=15000;
constdoubleLEV3=35000;
constdoubleRATE1=0.10;
constdoubleRATE2=0.15;
constdoubleRATE3=0.20;
intmain（）
{
usingnamespacestd;
doubleincome;
doubletax;
cout<<"Enteryourannualincomeintvarps:
";
cin>>income;
if（income<=LEV1）
tax=0;
elseif（income<=LEV2）
tax=（income-LEV1）*RATE1;
elseif（income<=LEV3）
tax=RATE1*（LEV2-LEV1）+RATE2*（income-LEV2）;
else
tax=RATE1*（LEV2-LEV1）+RATE2*（LEV3-LEV2）
+RATE3*（income-LEV3）;
cout<<"YouoweNeutronia"<return0;
}
//pe6-7.cpp
#include
#include
intmain（）
{
usingnamespacestd;
stringword;
charch;
intvowel=0;
intconsonant=0;
intother=0;
cout<<"Enterwords（qtoquit）:
\n";
cin>>word;
while（word!
="q"）
{
ch=tolower（word[0]）;
if（isalpha（ch））
{
if（ch=='a'||ch=='e'||ch=='i'||ch=='o'
||ch=='u'）
vowel++;
else
consonant++;
}
else
other++;
cin>>word;
}
cout<cout<cout<return0;
}
//pe6-8.cpp--countin
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