c++primerplus课后习题答案

1、solutions for programming exercises in c+ primer plus, 5th edition目录chapter 21pe 2-11pe 2-22pe 2-32pe 2-42pe 2-53pe 2-63chapter 34pe 3-14pe 3-24pe 3-35pe 3-45pe 3-56pe 3-66chapter 47pe 4-17pe 4-27pe 4-38pe 4-48pe 4-59pe 4-69pe 4-710pe 4-810pe 4-911chapter 512pe 5-112pe 5-212pe 5-313pe 5-413pe 5-514p

2、e 5-616pe 5-717pe 5-818pe 5-918chapter 619pe 6-119pe 6-219pe 6-320pe 6-421pe 6-522pe 6-623pe 6-725pe 6-826pe 6-926chapter 728pe 7-128pe 7-229pe 7-330pe 7-431pe 7-532pe 7-632pe 7-734pe 7-835pe 7-937chapter 838pe 8-138pe 8-238pe 8-339pe 8-440pe 8-541pe 8-642pe 8-743chapter 944pe 9-144pe 9-246pe 9-346p

3、e 9-447chapter 1047pe 10-147pe 10-249pe 10-350pe 10-451pe 10-553pe 10-656pe 10-757pe 10-859chapter 1161pe 11-161pe 11-266pe 11-370pe 11-475pe 11-577pe 11-680pe 11-782chapter 1285pe 12-185pe 12-286pe 12-390pe 12-493pe 12-595pe 12-699chapter 13104pe 13-1104pe 13-2108pe 13-3112pe 13-4115chapter 14119pe

4、 14-1119pe 14-2122pe 14-3125pe 14-4131pe 14-5134chapter 15140pe 15-1140pe 15-2143pe 15-3144pe 15-4147chapter 16151pe 16-1151pe 16-2151pe 16-3152pe 16-4153pe 16-5154pe 16-6155pe 16-7157pe 16-8158chapter 17159pe 17-1159pe 17-2159pe 17-3160pe 17-4160pe 17-5162pe 17-6163pe 17-7172chapter 2pe 2-1/pe2-1.c

5、pp#include int main()using namespace std;coutname: liangdongxu endl;coutaddress: china daliann;return 0;pe 2-2/ pe2-2.cpp#include int main(void) using namespace std; cout furlongs; double feet; feet = 220 * furlongs; cout furlongs furlongs = feet feetn; return 0;pe 2-3/ pe2-3.cpp#include using names

6、pace std;void mice();void run();int main() mice(); mice(); run(); run(); return 0;void mice() cout three blind micen;void run() cout see how they runn;pe 2-4/ pe2-4.cpp#include double c_to_f(double);int main() using namespace std; cout c; double f; f = c_to_f(c); cout c degrees celsius = f degrees f

7、ahrenheitn; return 0;double c_to_f(double temp) return 1.8 * temp + 32.0;pe 2-5/ pe2-5.cpp#include double lightyear_to_astro(double);int main() using namespace std; coutyears; astrounit = lightyear_to_astro(years); coutyears light years = astrounit astronomical units.n; return 0;double lightyear_to_

8、astro(double years) return 63240 * years;pe 2-6/ pe2-6.cpp#include using namespace std;void maketime(int, int);int main()double hours, minutes; couthours; coutminutes; maketime(hours,minutes); return 0;void maketime(int hours, int minutes) couttime: hours:minutesendl;chapter 3pe 3-1/ pe3-1.cpp#inclu

9、de const int inch_per_foot = 12;int main(void) using namespace std;/ note: some environments dont support the backspace character cout 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;pe 3-2/

10、pe3-2.cpp#include const int inch_per_foot = 12;const double meter_per_inch = 0.0254;const double pound_per_kilo = 2.2;int main(void) using namespace std;/ note: some environments dont support the backspace character cout ht_footht_inch; coutweight;double bmi = (weight/pound_per_kilo)/(ht_foot * inch

11、_per_foot+ht_inch)/meter_per_inch)*(ht_foot * inch_per_foot+ht_inch)/meter_per_inch);cout your height is ( ht_foot*inch_per_foot+ht_inch)” inches”;cout” and ”; cout your bmi is bmiendl; return 0;pe 3-3/ pe3-3.cpp#include const double mins_per_deg = 60.0;const double secs_per_min = 60.0;int main() us

12、ing namespace std; int degrees; int minutes; int seconds; double latitude; cout enter a latitude in degrees, minutes, and seconds:n; cout degrees; cout minutes; cout seconds; latitude = degrees + (minutes + seconds / secs_per_min)/mins_per_deg; cout degrees degrees, minutes minutes, seconds seconds

13、= latitude degreesn; return 0; pe 3-4/ pe3-4.cpp#include const int hours_per_day = 24;const int mins_per_hour = 60;const int seconds_per_minute = 60;int main() using namespace std; int day; int hour; int minute;int second; long seconds; cout seconds; day = seconds/(hours_per_day * mins_per_hour * se

14、conds_per_minute); hour = (seconds%(hours_per_day * mins_per_hour * seconds_per_minute)/(mins_per_hour*seconds_per_minute);minute = (seconds%(hours_per_day * mins_per_hour * seconds_per_minute)%(mins_per_hour*seconds_per_minute)/seconds_per_minute;second = (seconds%(hours_per_day * mins_per_hour * s

15、econds_per_minute)%(mins_per_hour*seconds_per_minute)%seconds_per_minute; cout seconds seconds = day days, hour hours, minute minutessecond secondsn; return 0; pe 3-5/ pe3-5.cpp#include int main(void) using namespace std; cout miles; cout gallons; cout your car got miles / gallons; cout miles per ga

16、llon.n; return 0;pe 3-6/ 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 euro_rating; / divide by liter_per_gallon to get gallons per 100-km / divide by km100_to_miles to ge

17、t 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;chapter 4pe 4-1/ pe4-1.cpp - storing strings in string objects#include int main() using names

18、pace std;const int arsize = 20;char firstnamearsize;char lastnamearsize;char grade;int age; cout what is your first name? ; cin.getline(firstname,arsize);coutlastname;/cin.getline(lastname,arsize); cout grade;coutage; coutname: lastname, firstnameendl;coutgrade: (char)(grade+1)endl;coutage: ageendl;

19、 return 0; pe 4-2/ 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 des

20、sert; cout for you, name .n; return 0; pe 4-3/ pe4-3.cpp - storing strings in char arrays#include #include const int size = 20;int main() using namespace std; char firstnamesize; char lastnamesize; char fullname2*size + 1; cout firstname; cout lastname; strncpy(fullname,lastname,size); strcat(fullna

21、me, , ); strncat(fullname, firstname, size); fullname2*size - 1 = 0; cout heres the information in a single string: fullname endl; return 0; pe 4-4/ pe4-4.cpp#include #include int main() using namespace std; string firstname; string lastname; string fullname; cout firstname; cout lastname; fullname

22、+= lastname; fullname +=, ; fullname += firstname; cout heres the information in a single string: fullname endl; return 0; pe 4-5/ pe4-5.cpp#include / a candybar structurestruct candybar char brand40; double weight; int calories;int main() using namespace std; /introduces namespace std candybar snac

23、k = mocha munch, 2.3, 350 ; cout brand name: snack.brand endl; cout weight: snack.weight endl; cout calories: snack.calories endl; return 0;pe 4-6/ pe4-6.cpp#include struct candybar char brand40; double weight; int calories;int main() using namespace std; /introduces namespace std candybar snack3 =

24、mocha munch, 2.3, 350,moncha,2.4,360, munch,2.5,370; coutthe first of snack is:n; cout brand name: snack0.brand endl; cout weight: snack0.weight endl; cout calories: snack0.calories endl;coutthe second of snack is:n; cout brand name: snack1.brand endl; cout weight: snack1.weight endl; cout calories:

25、 snack1.calories endl;coutthe third of snack is:n; cout brand name: snack2.brand endl; cout weight: snack2.weight endl; cout calories: snack2.calories endl; return 0;pe 4-7/ pe4-7.cpp#include const int slen = 70;struct pizza char nameslen; float diameter; float weight;int main(void) using namespace

26、std; pizza pie; cout what is the name of the pizza company? ; cin.getline(, slen); cout pie.diameter; cout pie.weight; cout company: n; cout diameter: pie.diameter inchesn; cout weight: pie.weight ouncesn; return 0;pe 4-8/ pe4-8.cpp#include const int slen = 70;struct pizza char name

27、slen; float diameter; float weight;int main(void) using namespace std; pizza* pie = new pizza; cout name, slen); cout pie-diameter; cout pie-weight; cout company: name n; cout diameter: diameter inchesn; cout weight: weight ouncesn; return 0;pe 4-9/ pe4-9.ccp#include struct candybar char brand40; do

28、uble weight; int calories;int main() using namespace std; /introduces namespace std candybar *candy= new candybar3; strcpy(candy0.brand,mocha munch); candy0.weight=2.3; candy0.calories=350; strcpy(candy1.brand,moncha); candy1.weight=2.4; candy1.calories=360; strcpy(candy2.brand,munch); candy2.weight

29、=2.5; candy2.calories=370; coutthe first of candy is:n; cout brand name: candy0.brand endl; cout weight: candy0.weight endl; cout calories: candy0.calories endl; coutthe second of candy is:n; cout brand name: candy1.brand endl; cout weight: candy1.weight endl; cout calories: candy1.calories endl; co

30、utthe third of candy is:n; cout brand name: candy2.brand endl; cout weight: candy2.weight endl; cout calories: candy2.calories endl; return 0;chapter 5pe 5-1/ pe5-1.cpp#include int main() using namespace std; int small,big;int sum = 0;coutplease input two integers for calculating the sum.n;coutsmall

31、;coutbig;for(int i=small;i=big;i+)sum += i;coutthe sum result between small and big is:sumendl; return 0;pe 5-2/ pe5-2.cpp#include int main(void) using namespace std; double sum = 0.0; double in; cout in; while (in != 0) sum += in; cout running total = sum n; cout in; cout bye!n; return 0;pe 5-3/ pe

32、5-3.cpp#include double investment = 100;const double interest1 = 0.1;const double interest2 = 0.05;int main()using namespace std;double bonus1,bonus2;double sum1 = 0;double sum2 = 0;int year = 0;bonus1 = investment * interest1;sum1 += bonus1;bonus2 = investment * interest2;investment += bonus2;sum2

33、+= bonus2; while(sum1sum2)year+;sum1 += bonus1;bonus2 = investment*interest2;investment += bonus2;sum2 += bonus2;coutover year+1 years cleos investment exceeds daphnes investment!n;coutcleos investment value is:sum1endl;coutdaphnes investment value is:sum2endl;return 0;pe 5-4/ pe5-4a.cpp/ book sales

34、 with char array.#include const int months = 12;const char * monthsmonths = january, february, march, april, may, june, july, august, september, october, november, december;int main() using namespace std; /introduces namespace std int salesmonths; int month; cout enter the monthly sales for c+ for f

35、ools:n; for (month = 0; month months; month+) cout sales for monthsmonth salesmonth; int total = 0; for (month = 0; month months; month+) total += salesmonth; cout total sales: total endl; return 0;/ pe5-4b.cpp/ book sales with string array.#include #include using namespace std;const int months = 12

36、;const string monthsmonths = january, february, march,april,may,june, july, august, september,october, november, december;int main() int salesmonths; int month; cout enter the monthly sales for c+ for fools:n; for (month = 0; month months; month+) cout sales for monthsmonth salesmonth; int total = 0

37、; for (month = 0; month months; month+) total += salesmonth; cout total sales: total endl; return 0;pe 5-5/ pe5-5.cpp#include const int months = 12;const int year = 3;const char * monthsmonths = january, february, march, april,may, june, july, august, september,october, november, december;int main()

38、 using namespace std; int salesyearmonths; int month; int year;for(year = 0;year 3; year+)if(year = 0)coutenter the first year sales for c+ for fools:n;else if(year = 1)coutenter the second year sales for c+ for fools:n;elsecoutenter the third year sales for c+ for fools:n;for (month = 0; month months; month+)cout sales for monthsmonth salesyearmonth; int totalone = 0;int totaltwo = 0;int totalthree = 0; int total = 0;int sum =0;for(year = 0; year 3; year+)sum =0; for (month = 0; month months; month+) total += salesyearmonth;sum +=