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c++ primer plus 第五版课后习题答案.pdf
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
Chapter 2
// pe2-2.cpp
#include
int main(void)
{
using namespace std;
cout << "Enter a distance in furlongs: ";
double furlongs;
cin >> furlongs;
double feet;
feet = 220 * furlongs;
cout << furlongs << " furlongs = "
<< feet << " feet\n";
return 0;
}
// pe2-3.cpp
#include
using namespace std;
void mice();
void run();
int main()
{
mice();
mice();
run();
run();
return 0;
}
void mice()
{
cout << "Three blind mice\n";
}
void run()
{
cout << "See how they run\n";
}
// pe2-4.cpp
#include
double C_to_F(double);
int main()
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
{
using namespace std;
cout << "Enter a temperature in Celsius: ";
double C;
cin >> C;
double F;
F = C_to_F(C);
cout << C << " degrees Celsius = "
<< F << " degrees Fahrenheit\n";
return 0;
}
double C_to_F(double temp)
{
return 1.8 * temp + 32.0;
}
Chapter 3
// pe3-1.cpp
#include
const int Inch_Per_Foot = 12;
int main(void)
{
using namespace std;
// Note: some environments don't support the backspace character
cout << "Please enter your height in inches: ___/b/b/b ";
int ht_inch;
cin >> ht_inch;
int ht_feet = ht_inch / Inch_Per_Foot;
int rm_inch = ht_inch % Inch_Per_Foot;
cout << "Your height is " << ht_feet << " feet, ";
cout << rm_inch << " inch(es).\n";
return 0;
}
// pe3-3.cpp
#include
const double MINS_PER_DEG = 60.0;
const double SECS_PER_MIN = 60.0;
int main()
{
using namespace std;
int degrees;
int minutes;
int seconds;
double latitude;
cout << "Enter a latitude in degrees, minutes, and seconds:\n";
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
cout << "First, enter the degrees: ";
cin >> degrees;
cout << "Next, enter the minutes of arc: ";
cin >> minutes;
cout << "Finally, enter the seconds of arc: ";
cin >> seconds;
latitude = degrees + (minutes + seconds / SECS_PER_MIN)/MINS_PER_DEG;
cout << degrees << " degrees, " << minutes << " minutes, "
<< seconds << " seconds = " << latitude << " degrees\n";
return 0;
}
// pe3-5.cpp
#include
int main(void)
{
using namespace std;
cout << "How many miles have you driven your car? ";
float miles;
cin >> miles;
cout << "How many gallons of gasoline did the car use? ";
float gallons;
cin >> gallons;
cout << "Your car got " << miles / gallons;
cout << " miles per gallon.\n";
return 0;
}
// pe3-6.cpp
#include
const double KM100_TO_MILES = 62.14;
const double LITERS_PER_GALLON = 3.875;
int main ( void )
{
using namespace std;
double euro_rating;
double us_rating;
cout << "Enter fuel consumption in liters per 100 km: ";
cin >> euro_rating;
// divide by LITER_PER_GALLON to get gallons per 100-km
// divide by KM100_TO_MILES to get gallons per mile
// invert result to get miles per gallon
us_rating = (LITERS_PER_GALLON * KM100_TO_MILES) / euro_rating;
cout << euro_rating << " liters per 100 km is ";
cout << us_rating << " miles per gallon.\n";
return 0;
}
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
Chapter 4
// pe4-2.cpp -- storing strings in string objects
#include
#include
int main()
{
using namespace std;
string name;
string dessert;
cout << "Enter your name:\n";
getline(cin, name); // reads through newline
cout << "Enter your favorite dessert:\n";
getline(cin, dessert);
cout << "I have some delicious " << dessert;
cout << " for you, " << name << ".\n";
return 0;
}
// pe4-3.cpp -- storing strings in char arrays
#include
#include
const int SIZE = 20;
int main()
{
using namespace std;
char firstName[SIZE];
char lastName[SIZE];
char fullName[2*SIZE + 1];
cout << "Enter your first name: ";
cin >> firstName;
cout << "Enter your last name: ";
cin >> lastName;
strncpy(fullName,lastName,SIZE);
strcat(fullName, ", ");
strncat(fullName, firstName, SIZE);
fullName[SIZE - 1] = '\0';
cout << "Here's the information in a single string: "
<< fullName << endl;
return 0;
}
// pe4-5.cpp
// a candybar structure
struct CandyBar {
char brand[40];
double weight;
int calories;
};
#include
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
int main()
{
using namespace std; //introduces namespace std
CandyBar snack = { "Mocha Munch", 2.3, 350 };
cout << "Brand name: " << snack.brand << endl;
cout << "Weight: " << snack.weight << endl;
cout << "Calories: " << snack.calories << endl;
return 0;
}
// pe4-7.ccp
#include
const int Slen = 70;
struct pizza {
char name[Slen];
float diameter;
float weight;
};
int main(void)
{
using namespace std;
pizza pie;
cout << "What is the name of the pizza company? ";
cin.getline(pie.name, Slen);
cout << "What is the diameter of the pizza in inches? ";
cin >> pie.diameter;
cout << "How much does the pizza weigh in ounces? ";
cin >> pie.weight;
cout << "Company: " << pie.name << "\n";
cout << "Diameter: " << pie.diameter << " inches\n";
cout << "Weight: " << pie.weight << " ounces\n";
return 0;
}
Chapter 5
// pe5-2.cpp
#include
int main(void)
{
using namespace std;
double sum = 0.0;
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
double in;
cout << "Enter a number (0 to terminate) : ";
cin >> in;
while (in != 0) {
sum += in;
cout << "Running total = " << sum << "\n";
cout << "Enter next number (0 to terminate) : ";
cin >> in;
}
cout << "Bye!\n";
return 0;
}
// pe5-4.cpp
// book sales
#include
const int MONTHS = 12;
const char * months[MONTHS] = {"January", "February", "March", "April",
"May", "June", "July", "August", "September",
"October", "November", "December"};
int main()
{
using namespace std; //introduces namespace std
int sales[MONTHS];
int month;
cout << "Enter the monthly sales for \"C++ for Fools\":\n";
for (month = 0; month < MONTHS; month++)
{
cout << "Sales for " << months[month] << ": ";
cin >> sales[month];
}
double total = 0.0;
for (month = 0; month < MONTHS; month++)
total += sales[month];
cout << "Total sales: " << total << endl;
return 0;
}
// pe5-6.cpp
#include
struct car { char name[20]; int year;};
int main(void)
{
using namespace std;
int n;
cout << "How many cars do you wish to catalog?: ";
SP 6 of 73 September 2, 2004
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
cin >> n;
while(cin.get() != '\n') // get rid of rest of line
;
car * pc = new car [n];
int i;
for (i = 0; i < n; i++)
{
cout << "Car #" << (i + 1) << ":\n";
cout << "Please enter the make: ";
cin.getline(pc[i].name,20);
cout << "Please enter the year made: ";
cin >> pc[i].year;
while(cin.get() != '\n') // get rid of rest of line
;
}
cout << "Here is your collection:\n";
for (i = 0; i < n; i++)
cout << pc[i].year << " " << pc[i].name << "\n";
delete [] pc;
return 0;
}
// pe5-7.cpp -- count words using C-style string
#include
#include // prototype for strcmp()
const int STR_LIM = 50;
int main()
{
using namespace std;
char word[STR_LIM];
int count = 0;
cout << "Enter words (to stop, type the word done):\n";
while (cin >> word && strcmp("done", word))
++count;
cout << "You entered a total of " << count << " words.\n";
return 0;
}
// pe5-9.cpp
//nested loops
#include
int main()
{
using namespace std; //introduces namespace std
int rows;
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Solutions for Programming Exercises in C++ Primer Plus, 5th Edition
int row;
int col;
int periods;
cout << "Enter number of rows: ";
cin >> rows;
for (row = 1; row <= rows; row++)
{
periods = rows - row;
for (col = 1; col <= periods; col++)
cout << '.';
// col already has correct value for next loop
for ( ; col <= rows; col++)
cout << '*';
cout << endl;
}
return 0;
}
Chapter 6
// pe6-1.cpp
#include
#include
int main( )
{
using namespace std; //introduces namespace std
char ch;
cin.get(ch);
while(ch != '@')
{
if (!isdigit(ch))
{
if (isupper(ch))
ch = tolower(ch);
else if (islower(ch))
ch = toupper(ch);
cout << ch;
}
cin.get(ch);
}
return 0;
}
// pe6-3.cpp
#include
int main(void)
{
SP 8 of 73 September 2, 2004
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