c++primerplus(第六版)課后編程練習答案

1、第二章：開始學習C+/ex2.1-display your name and address#include<iostream>int main(void)using namespace std;cout<<"My name is liao chunguang and I live in hunan chenzhou.n”；/ex2.2-convert the furlong units to yard uints-把浪單位換位碼單位#include<iostream>double fur2yd(double);int main()using na

2、mespace std;cout<<"enter the distance measured by furlong units:"double fur;cin>>fur;cout<<"convert the furlong to yard"<<endl;double yd;yd=fur2yd(fur);cout<<fur<<" furlong is "<<yd<<" yard"<<endl;return 0;

3、double fur2yd(double t)return 220*t;/ex2.3-每個函數(shù)都被調用兩次#include<iostream>void mice();void see();using namespace std;int main()mice();mice();see();see();return 0;void mice()cout<<"three blind mice"<<endl;void see()cout<<"see how they run"<<endl;/ex2.4#i

4、nclude<iostream>int main() using namespace std; cout<<"Enter your age:" int age; cin>>age; int month; month=age*12; cout<<age<<" years is "<<month<<" months"<<endl; return 0;/ex2.5-convert the Celsius valve to Fahrenheit v

5、alue#include<iostream>double C2F(double);int main()using namespace std;cout<<"please enter a Celsius value:"double C;cin>>C;double F;F=C2F(C);cout<<C<<" degrees Celsius is "<<F<<" degrees Fahrenheit."<<endl;return 0;double

6、 C2F(double t)return 1.8*t+32; /ex2.6-convert the light years valve to astronomical units-把光年轉換為天文單位#include<iostream>double convert(double);/函數(shù)原型int main()using namespace std;cout<<"Enter the number of light years:"double light_years;cin>>light_years;double astro_units;a

7、stro_units=convert(light_years);cout<<light_years<<" light_years = "<<astro_units<<" astronomical units."<<endl;return 0;double convert(double t)return 63240*t;/1 光年=63240 天文單位 /ex2.7-顯示用戶輸入的小時數(shù)和分鐘數(shù)#include<iostream>void show();main()using name

8、space std;show();return 0;void show()using namespace std;int h,m;cout<<"enter the number of hours:"cin>>h;cout<<"enter the number of minutes:"cin>>m;cout<<"Time:"<<h<<":"<<m<<endl;第三章：處理數(shù)據(jù)/ex3.1將身高用英尺(feet)

9、和英寸(inch)表示#include<iostream>const int inch_per_feet=12;/ const常量-1feet=12inches-1英尺=12英寸int main()using namespace std;cout<<"please enter your height in inches:_bbb"/ b表示為退格字符int ht_inch;cin>>ht_inch;int ht_feet=ht_inch/inch_per_feet;/取商int rm_inch=ht_inch%inch_per_feet;

10、/取余cout<<"your height is "<<ht_feet<<" feet,and "<<rm_inch<<" inchesn"return 0;/ex3.2-計算相應的body mass index（體重指數(shù)）#include<iostream>const int inch_per_feet=12;const double meter_per_inch=0.0254;const double pound_per_kilogram=2.2;int ma

11、in()using namespace std;cout<<"Please enter your height:"<<endl;cout<<"First,enter your height of feet part（輸入你身高的英尺部分）:_b"int ht_feet;cin>>ht_feet;cout<<"Second,enter your height of inch part（輸入你身高的英寸部分）:_b"int ht_inch;cin>>ht_inch;c

12、out<<"Now,please enter your weight in pound:_bbb"double wt_pound;cin>>wt_pound;int inch;inch=ht_feet*inch_per_feet+ht_inch;double ht_meter;ht_meter=inch*meter_per_inch;double wt_kilogram;wt_kilogram=wt_pound/pound_per_kilogram;cout<<endl;cout<<"Your pensonal bo

13、dy information as follows:"<<endl;cout<<"身高:"<<inch<<"(英尺inch)n"<<"身高:"<<ht_meter<<"(米meter)n"<<"體重:"<<wt_kilogram<<"(千克kilogram)n"double BMI;BMI=wt_kilogram/(ht_meter*ht_mete

14、r);cout<<"your Body Mass Index(體重指數(shù)) is "<<BMI<<endl;return 0;/ex3.3 以度，分，秒輸入，以度輸出#include<iostream>const int minutes_per_degree=60;const int seconds_per_minute=60;int main()using namespace std;cout<<"Enter a latitude in degrees,minutes,and seconds:n"

15、;cout<<"First,enter the degrees:"int degree;cin>>degree;cout<<"Next,enter the minutes of arc:"int minute;cin>>minute;cout<<"Fianlly,enter the seconds of arc:"int second;cin>>second;double show_in_degree;show_in_degree=(double)degree+(

16、double)minute/minutes_per_degree+(double)second/minutes_per_degree/seconds_per_minute;cout<<degree<<" degrees,"<<minute<<" minutes,"<<second<<"seconds ="<<show_in_degree<<" degreesn"return 0;/ex3.4#include<ios

17、tream>const int hours_per_day=24;const int minutes_per_hour=60;const int seconds_per_minute=60;int main()using namespace std;cout<<"Enter the number of seconds:"long seconds;cin>>seconds;int Day,Hour,Minute,Second;Day=seconds/seconds_per_minute/minutes_per_hour/hours_per_day

18、;Hour=seconds/seconds_per_minute/minutes_per_hour%hours_per_day;Minute=seconds/seconds_per_minute%minutes_per_hour;Second=seconds%seconds_per_minute;cout<<seconds<<"seconds = "<<Day<<" days,"<<Hour<<" hours,"<<Minute<<&quo

19、t; minutes,"<<Second<<" secondsn"return 0;/ex3.5#include<iostream>int main() using namespace std; cout<<"Enter the world population:" long long world_population; cin>>world_population; cout<<"Enter the population of the US:" long

20、 long US_population; cin>>US_population; double percentage; percentage=(double)US_population/world_population*100; cout<<"The population of the US is "<<percentage<<"% of the world population.n" return 0;/ex3.6  汽車耗油量-美國(mpg)or歐洲風格(L/100Km)#include<

21、;iostream>int main() using namespace std; cout<<"Enter the miles of distance you have driven:" double m_distance; cin>>m_distance; cout<<"Enter the gallons of gasoline you have used:" double m_gasoline; cin>>m_gasoline

22、; cout<<"Your car can run "<<m_distance/m_gasoline<<" miles per gallonn" cout<<"Computing by European style:n" cout<<"Enter the distance in kilometers:" double k_distance; cin>>k_distance; cout&

23、lt;<"Enter the petrol in liters:" double k_gasoline; cin>>k_gasoline; cout<<"In European style:"<<"your can used "<<100*k_gasoline/k_distance<<" liters of petrol per 100 kilometersn" return 0;/ex3.7 automobi

24、le gasoline consumption-耗油量-歐洲風格(L/100Km)轉換成美國風格(mpg)#include<iostream>int main()using namespace std;cout<<"Enter the automobile gasoline consumption figure inn"<<"European style(liters per 100 kilometers):"double Euro_style;cin>>Euro_style;cout<<&qu

25、ot;Converts to U.S. style(miles per gallon):"<<endl;cout<<Euro_style<<" L/100Km = "<<62.14*3.875/Euro_style<<" mpgn"return 0;/ Note that 100 kilometers is 62.14 miles, and 1 gallon is 3.875 liters. /Thus, 19 mpg is about 12.4 L/100Km, and 27 mpg

26、 is about 8.7 L/100Km.Enter the automobile gasoline consumption figure inEuropean style(liters per 100 kilometers):12.4Converts to U.S. style(miles per gallon):12.4 L/100Km = 19.4187 mpgPress any key to continue/ ex3.7 automobile gasoline consumption-耗油量-美國風格(mpg)轉換成歐洲風格(L/100Km)#include<iostream

27、>int main()using namespace std;cout<<"Enter the automobile gasoline consumption figure inn"<<"U.S. style(miles per gallon):"double US_style;cin>>US_style;cout<<"Converts to European style(miles per gallon):"<<endl;cout<<US_style<

28、;<" mpg = "<< 62.14*3.875/US_style<<"L/100Kmn"return 0;/ Enter the automobile gasoline consumption figure inU.S. style(miles per gallon):19Converts to European style(miles per gallon):19 mpg = 12.6733L/100KmPress any key to continue第四章 復合類型/ex4.1 display the inform

29、ation of student#include<iostream>const int Asize=20;using namespace std;struct student/定義結構描述char firstnameAsize;char lastnameAsize;char grade;int age;void display(student);/函數(shù)原型放在結構描述后int main()cout<<"what is your first name?"<<endl;student lcg;/創(chuàng)建結構變量（結構數(shù)據(jù)對象）cin.getlin

30、e(lcg.firstname,Asize);cout<<"what is your last name?"<<endl;cin.getline(lcg.lastname,Asize);cout<<"what letter grade do you deserve?"<<endl;cin>>lcg.grade;cout<<"what is your age?"<<endl;cin>>lcg.age;display(lcg);return 0

31、;void display(student name)cout<<"Name: "<<name.firstname<<","<<name.lastname<<endl;cout<<"Grade:"<<char(name.grade+1)<<endl;cout<<"Age:"<<name.age<<endl;/ex4.2 use the string-class instead of c

32、har-array#include<iostream>#include<string>int main()using namespace std;string name,dessert;cout<<"Enter your name: n"getline(cin,name); cout<<"Enter your favorite dessert: n"getline(cin,dessert); cout<<"I have some delicious "<<dess

33、ert;cout<<" for you, "<<name<<".n"return 0;/有時候會遇到需要按下兩次回車鍵才能正確的顯示結果，這是vc+6.0的一個BUG，更改如下：else if (_Tr:eq(_E)_C, _D) _Chg = true; _I.rdbuf()->sbumpc();/修改后的 break; ex4.3 輸入其名和姓，并組合顯示#include<iostream>#include<cstring>const int Asize=20;int main()us

34、ing namespace std;char fnameAsize;char lnameAsize;char fullname2*Asize+1;cout<<"Enter your first name:"/輸入名字，存儲在fname數(shù)組中cin.getline(fname,Asize);cout<<"Enter your last name:"/輸入姓，存儲在lname數(shù)組中cin.getline(lname,Asize);strncpy(fullname,lname,Asize);/把姓lname復制到fullname空數(shù)組中

35、strcat(fullname,", ");/把“， ”附加到上述fullname尾部strncat(fullname,fname,Asize);/把fname名字附加到上述fullname尾部fullname2*Asize='0'/為防止字符型數(shù)組溢出，在數(shù)組結尾添加結束符 cout<<"Here's the information in a single string:"<<fullname<<endl;/顯示組合結果return 0;/ex4.4 使用string對象 存儲、顯示組合結果#

36、include<iostream>#include<string>int main()using namespace std;string fname,lname,attach,fullname;cout<<"Enter your first name:"getline(cin,fname);/note:將一行輸入讀取到string類對象中使用的是getline(cin,str) /它沒有使用句點表示法，所以不是類方法cout<<"Enter your last name:"getline(cin,lnam

37、e);attach=", "fullname=lname+attach+fname;cout<<"Here's the information in a single string:"<<fullname<<endl;return 0;/ex4.5 declare a struct and initialize it 聲明結果并創(chuàng)建一個變量#include<iostream>const int Asize=20;struct CandyBarchar brandAsize;double weight

38、;int calory;int main()using namespace std;CandyBar snack="Mocha Munch",2.3,350;cout<<"Here's the information of snack:n"cout<<"brand:"<<snack.brand<<endl;cout<<"weight:"<<snack.weight<<endl;cout<<"calory

39、:"<<snack.calory<<endl;return 0;/ex4.6 結構數(shù)組的聲明及初始化#include<iostream>const int Asize=20;struct CandyBarchar brandAsize;double weight;int calory;int main()using namespace std;CandyBar snack3="Mocha Munch",2.3,350,"XuFuJi",1.1,300,"Alps",0.4,100; for

40、(int i=0;i<3;i+)/利用for循環(huán)來顯示snack變量的內容cout<<snacki.brand<<endl<<snacki.weight<<endl<<snacki.calory<<endl<<endl;return 0;/ex4.7 pizza披薩餅#include<iostream>#include<string>const int Size=20;struct pizza/聲明結構char companySize;double diameter;double

41、weight;int main()using namespace std;pizza pie;/創(chuàng)建一個名為pie的結構變量cout<<"What's the name of pizza company:"cin.getline(pany,Size);cout<<"What's the diameter of pizza:"cin>>pie.diameter;cout<<"What's the weight of pizza:"cin>>pie.wei

42、ght;cout<<"company:"<<pany<<endl;cout<<"diameter:"<<pie.diameter<<"inches"<<endl;cout<<"weight:"<<pie.weight<<"ounches"<<endl;return 0;/ex4.8 pizza pie 披薩餅 使用new創(chuàng)建動態(tài)結構#include<iostr

43、eam>#include<string>const int Size=20;struct pizza/聲明結構char companySize;double diameter;double weight;int main()using namespace std;pizza *pie=new pizza;/使用new創(chuàng)建動態(tài)結構cout<<"What's the diameter of pizza:"cin>>pie->diameter;cin.get();/讀取下一個字符cout<<"What&

44、#39;s the name of pizza company:"cin.get(pie->company,Size);cout<<"What's the weight of pizza:"cin>>pie->weight;cout<<"diameter:"<<pie->diameter<<" inches"<<endl;cout<<"company:"<<pie->compan

45、y<<endl;cout<<"weight:"<<pie->weight<<" ounches"<<endl;delete pie;/delete釋放內存return 0;/ex.4.9 使用new動態(tài)分配數(shù)組方法1#include<iostream>#include<string>using namespace std;struct CandyBarstring brand;double weight;int calory;int main()CandyBar *

46、snack= new CandyBar3;snack0.brand="A"/單個初始化由new動態(tài)分配的內存snack0.weight=1.1;snack0.calory=200;snack1.brand="B"snack1.weight=2.2;snack1.calory=400;snack2.brand="C"snack2.weight=4.4;snack2.calory=500;for(int i=0;i<3;i+)cout << " brand: " << snacki.bra

47、nd << endl;cout << " weight: " << snacki.weight << endl;cout << " calorie: " << snacki.calory << endl<<endl;delete snack; return 0;/ex.4.10 數(shù)組方法1#include <iostream>int main() using namespace std; const int Size = 3; int succes

48、sSize; cout<<"Enter your success of the three times 40 meters running:n"cin >> success0>>success1>>success2; cout<<"success1:"<<success0<<endl;cout<<"success2:"<<success1<<endl;cout<<"success3:"

49、<<success2<<endl;double average=(success0+success1+success2)/3;cout<<"average:"<<average<<endl; return 0; /ex.4.10 array方法2#include <iostream>#include <array>int main() using namespace std;array<double,4>ad=0; cout<<"Enter your suc

50、cess of the three times 40 meters running:n"cin >> ad0>>ad1>>ad2; cout<<"success1:"<<ad0<<endl;cout<<"success2:"<<ad1<<endl;cout<<"success3:"<<ad2<<endl;ad3=(ad0+ad1+ad2)/3;cout<<"av

51、erage:"<<ad3<<endl; return 0; 第五章 循環(huán)和關系表達式/ex.5.1#include <iostream>int main() using namespace std; cout<<"Please enter two integers: " int num1,num2; cin>>num1>>num2; int sum=0; for(int temp=num1;temp<=num2;+temp)/or temp+ sum+=temp; cout<<

52、;"The sum from "<<num1<<" to "<<num2<<" is "<<sum<<endl; return 0;/ex.5.2#include <iostream>#include<array>int main() using namespace std;array<long double,101>ad=0; ad1=ad0=1L;for(int i=2;i<101;i+)adi=i*adi-1;for

53、(int i=0;i<101;i+)cout<<i<<"! = "<<adi<<endl; return 0;/ex.5.3#include <iostream>int main() using namespace std; cout<<"Please enter an integer: " int sum=0,num; while(cin>>num)&&num!=0) sum+=num; cout<<"So far, the

54、sum is "<<sum<<endl; cout<<"Please enter an integer: " return 0;/ex.5.4#include <iostream>int main() using namespace std; double sum1,sum2; sum1=sum2=0.0; int year=0; while(sum2<=sum1) +year; sum1+=10; sum2=(100+sum2)*0.05+sum2; cout<<"經(jīng)過"<

55、;<year<<"年后，Cleo的投資價值才能超過Daphne的投資價值。"<<endl; cout<<"此時，Cleo的投資價值為"<<sum1<<"，而Daphne的投資價值為"<<sum2<<endl; return 0; /ex.5.5#include <iostream>const int MONTHS = 12;const char* monthsMONTHS="January","Febru

56、ary","March","April","May","June","July","August","September","October","November","December"int main() using namespace std; int salesMONTHS,sum=0; for(int i=0;i<MONTHS;i+) cout<<"請

57、輸入在"<<monthsi<<"的C+ For Fools的銷售量：" cin>>salesi; sum+=salesi; cout<<"這一年中的C+ For Fools的總銷售量為："<<sum<<endl; return 0;/ex.5.6#include <iostream>const int MONTHS = 12;const char* monthsMONTHS="January","February",&qu

58、ot;March","April","May","June","July","August","September","October","November","December"const char* years3="第一年","第二年","第三年"int main() using namespace std; int year_sale3,sum=0,sales3MONTHS; for(int i=0;i<3;i+) int temp=0; cout<<yearsi<<"的每個月銷售量:"<<endl; for(int j=