C++Primer源代码.pdf

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1、Sample Solutions for Programming Exercises in C+Primer Plus,3rd EditionChapter 22.Write a C+program that asks for a distance in furlongs and converts it to yards(one furlong is 220 yards)./pe2-2.cpp#include using namespace std;int main(void)(cout Enter a distance in furlongs:double furlongs;cin furl

2、ongs;double feet;feet=220*furlongs;cout furlongs furlongs=feet feetnH;return 0;)3.Write a C+program that uses three user-defined functions(counting mainQ as one)and produces the following output:Three blind miceThree blind miceSee how they runSee how they runOne function,called two times,should prod

3、uce the first two lines,and the remainingfunction,also called twice,should produce the remaining output./pe2-3.cpp#include using namespace 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 runnH;4.Write a program

4、 that has main。call a user-defined function that takes a Celsiustemperature value as an argument and then returns the equivalent FahrenheitStephen Prata 1 July 22,1999 Sample Solutions for Programming Exercises in C+Primer Plus,3rd Editionvalue.The program should request the Celsius value as input f

5、rom the user anddisplay the result,as shown in the following code:Please enter a Celsius value:2020 degrees Celsius is 68 degrees Fahi*enheit.For reference,here is the formula for making the conversion:Fahrenheit=1.8 X Celsius+32.0/pe2-4.cpp#include using namespace std;double C_to_F(double);int main

6、()(cout nEnter a temperature in Celsius:double C;cin C;double F;F=Co_F(C);cout C ”degrees Celsius=F degrees FahrenheitnH;return 0;)double C_to_F(double temp)(return 1.8*temp+32.0;)Chapter 31.Write a short program that asks for your height in integer inches and then convertsyour height to feet and in

7、ches.Have the program use the underline character toindicate where to type the response.Also use a const type./pe3-l.cpp#include using namespace std;const int Inch_Per_Foot=12;int main(void)/Note:some environments dont support the backspace charactercout ”Please enter your height in inches:_/b/b/b”；

8、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).nn;return 0;3.Write a program that asks how many miles you have driven and how many gallonsof gasoline you used and then reports the miles per gallon yo

9、ur car got.Or,Stephen Prata 2 July 22,1999 Sample Solutions for Programming Exercises in C+Primer Plus,3rd Editionif you prefer,the program can request distance in kilometers and petrol in liters andthen report the result European style,in liters per 100 kilometers.(Or,perhaps,youcan use litres per

10、100 kilometres.)/pe3-3.cpp#include using namespace std;int main(void)(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 gotM miles/gallons;cout ”miles per gallon.nM;return 0;)Chapter 42.The C

11、andyBar structure contains three members.The first member holds the brandname of a candy bar.The second member holds the weight(which may have afractional part)of the candy bar,and the third member holds the number of calories(an integer value)in the candy bar.Write a program that declares such a st

12、ructure andcreates a CandyBar variable called snack,initializing its members to Mocha Munch,2.3,and 350 respectively.The initialization should be part of the declaration for snack.Finally,the program should display the contents of the snack variable./pe4-2.cpp/a candybar struct CandyBar char brand40

13、;double weight;intcalories;#include using namespace std;/introduces namespace stdint main()CandyBar snack=nMocha Munch,2.3,350;cout ”Brand name:snack.brand endl;cout Weight:snack.weight endl;cout ”Calories:snack.calories endl;return 0;Stephen Prata 3 July 22,1999 Sample Solutions for Programming Exe

14、rcises in C+Primer Plus,3rd Edition4.William Wingate runs a pizza-analysis service.For each pizza,he needs to recordthe following information:IbJ the name of the pizza company,which may consist of more than one wordIbJ the diameter of pizzalb the weight of the pizzaDevise a structure that can hold t

15、his information and write a program using a structurevariable of that type.The program should ask the user to enter each of the items ofinformation listed above,and then the program should display that information.Usecin(or its methods)and cout./pe4-4.ccp#include using namespace std;const int Slen=7

16、0;struct pizza char nameSlenJ;float diameter;float weight;int main(void)(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

17、.name n;cout Diameter:pie.diameter inchesn;cout Weight:pie.weight ouncesnM;return 0;)Chapter 52.Write a program that asks you to type in numbers.After each entry,the numberreports the cumulative sum of the entries to date.The program terminates when youenter a zero./pe5-2.cpp#include using namespace

18、 std;int main(void)(double sum=0.0;double in;cout Enter a number(0 to terminate):；cin in;while(in!=0)sum+=in;cout Running total=sum n”;Stephen Prata 4 July 22,1999 Sample Solutions for Programming Exercises in C+Primer Plus,3rd Editioncout Enter next number(0 to terminate):cin in;)cout Bye!n；return

19、0;)4.You sell C+For Fools.Write a program that has you enter a years worth ofmonthly sales(in terms of number of books,not of money).The program should use aloop to prompt you by month,using an array of char*initialized to the month stringsand storing the input data in an array of int.Then,the progr

20、am should find the sum ofthe array contents and report the total sales for the year./pe5-4.cpp/book sales#include using namespace std;/introducesname space stdconst int MONTHS=12;const char*monthsMONTHS=January,February，March，April,“May”，“June”，“July”，“August，“September”，October,November,December；in

21、t main()int salesMONTHSJ;int month;cout MEnter the monthly sales for C+for Fools*,:nM;for(month=0;month MONTHS;month+)cout Sales for monthsmonth cin salesmonth;)double total=0.0;for(month=0;month MONTHS;month+)total+=salesmonth;cout Total sales:total endl;return 0;6.Design a structure called car tha

22、t holds the following information about anautomobile:its make(as a string in a character array)and the year it was built(as aninteger).Write a program that asks the user how many cars to catalog.The programshould then use new to create a dynamic array of that many car structures.Next,itshould prompt

23、 the user to input the make and year information for each structure.Note that this requires some care,for it alternates reading strings with numeric data.(See Chapter 4,Derived Types,n for more information.)Finally,it should display thecontents of each structure.A sample run should look something li

24、ke the following:How many cars do you wish to catalog?2Car#l:Please enter the make:Hudson HornetPlease enter the year made:1952Car#2:Stephen Prata 5 July 22,1999 Sample Solutions for Programming Exercises in C+Primer Plus,3rd EditionPlease enter the make:KaiserPlease enter the year made:1951Here is

25、your collection:1952 Hudson Hornet1951 Kaiser/pe5-6.cpp#include using namespace std;struct car char name20;int year;int main(void)(int n;cout ”How many cars do you wish to catalog?:；cin n;while(cin.get()!=n)/get rid of rest of linecar*pc=new car n;int i;for(i=0;i n;i+)(cout Car#(i+1)”:n；cout Please

26、enter the make:；cin.getline(pci.name,20);cout ”Please enter the year made:cin pci.year;while(cin.get()!=n)/get rid of rest of linecout Here is your collection:n;for(i=0;i n;i+)cout pci.year pcij.name HnH;delete pc;return 0;7.Write a program using nested loops that asks the user to enter a value for

27、thenumber of rows to displayed.It then displays that many rows of asterisks,with oneasterisk in the first row,two in the second row,and so on.For each row,the asterisksare preceded by the number of periods needed to make all the rows display a totalnumber of characters equal to the number of rows.A

28、sample run would look like this:Enter number of rows:5*/pe5-7.cpp/nested loops#include using namespace std;/introduces namespace stdint main()int rows;int row;int col;Stephen Prata 6 July 22,1999 Sample Solutions for Programming Exercises in C+Primer Plus,3rd Editionint periods;cout nEnter number of

29、 rows:cin rows;for(row=1;row=rows;row+)periods=rows-row;for(col=1;col=periods;col+)cout 7;/col already has correct value for next loopfor(;col=rows;col+)coutcout endl;)return 0;Chapter 61.Write a program that reads keyboard input to the symbol and that echoes theinput except for digits,converting ea

30、ch uppercase character to lowercase,and viceversa.(Don*t forget the cctype family.)/pe6-l.cpp#include#include using namespace std;/introduces namespace std int main()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);)r

31、eturn 0;)3.Write a precursor to a menu-driven program.The program should display a menuoffering four choices,each labeled with a letter.If the user responds with a letter otherthan one of the four valid choices,the program should prompt the user to enter a validresponse until the user complies.The p

32、rogram should then use a switch to select asimple action based on the users selection.A program run could look something likethis:Please enter one of the following choices:c)carnivore p)pianistt)tree g)gamefPlease enter a c,p,t,or g:qPlease enter a c,p,t,or g:tStephen Prata 7 July 22,1999 Sample Sol

33、utions for Programming Exercises in C+Primer Plus,3rd EditionA maple is a tree./pe6-3.cpp#include using namespace std;int main(void)(cout ”Please enter one of the following choices:;cout c)carnivore p)pianistno t)tree g)gamenn;char ch;cin ch;while(ch!=*c,&ch!=*p,&ch!=t&ch!=g)(cout nPlease enter a c,

34、p,t,or g:cin ch;)switch(ch)(case c:cout HA cat is a camivore.nM;break;case p*:cout Radu Lupu is a pianist.n;break;case t:cout A maple is a tree.n;break;case*g*:cout nGolf is a game.nH;break;default:cout The program shouldnt get here!n;)return 0;5.The Kingdom of Neutronia,where the unit of currency i

35、s the tvarp,has thefollowing income tax code:first 5000 tvarps:0%taxnext 10000 tvaips:10%taxnext 20000 tvaips:15%taxtvarps after 35000:20%taxFor example,someone earning 38000 tvarps would owe 5000 x 0.00+10000 x 0.10+20000 x 0.15+3000 x 0.20,or 4600 tvarps.Write a program that uses a loop to solicit

36、incomes and to report tax owed.The loop terminates when the user enters a negativenumber or nonnumeric input./pe6-5.cpp/Neutronia taxation#include using namespace std;constdouble LEVI=5000;const double LEV2=15000;const double LEV3=35000;const double RATE1=0.10;const double RATE2=0.15;const double RA

37、TE3=0.20;int main()(double income;double tax;cout Enter your annual income in tvarps:；cin income;Stephen Prata 8 July 22,1999 Sample Solutions for Programming Exercises in C+Primer Plus,3rd Editionif(income=LEVI)tax=0;else if(income=LEV2)tax=(income-LEVI)*RATE1;else if(income=LEV3)tax=RATE1*(LEV2-LE

38、VI)+RATE2*(income-LEV2);elsetax=RATE1*(LEV2-LEVI)+RATE2*(LEV3-LEV2)+RATE3*(income-LEV3);cout ”You owe Neutronia tax ”tvarps in taxesAn1 1;return 0;)Chapter 71.Write a program that repeatedly asks you to enter pairs of numbers until at least oneof the pair is zero.For each pair,the program should use

39、 a function to calculate theharmonic mean of the numbers.The function should return the answer to main。,which reports the result.The harmonic mean of the numbers is the inverse of theaverage of the inverses and can be calculated as follows:harmonic mean=2.0*x*y/(x+y)/pe7-l.cpp-harmonic mean#include

40、using namespace std;double h_mean(double x,double y);int main(void)double x,y;cout Enter two numbers(a 0 terminates):while(cin x y&x*y!=0)cout ”harmonic mean of x and y n h_mean(x,y)“n；/*or do the reading and testing in two parts:while(cin x&x!=0)cin y;if(y=0)break;*/cout Byenn;return 0;double h_mea

41、n(double x,double y)(return 2.0*x*y/(x+y);3.Here is a structure template:struct boxchar maker40;float height;float width;float length;float volume;)；Stephen Prata 9 July 22,1999 Sample Solutions for Programming Exercises in C+Primer Plus,3rd Editiona.Write a function that passes a box structure by v

42、alue and that displays the value ofeach member.b.Write a function that passes the address of a box structure and that sets the volumemember to the product of the other three dimensions.c.Write a simple program using these two functions./pe7-3.cpp#include using namespace std;struct box char maker40;f

43、loat height;float width;float length;float volume;);void showbox(box b);void setbox(box*pb);int main(void)(box carton=Bingo Boxer,2,3,5;/no volume providedsetbox(&carton);showbox(carton);return 0;)void showbox(box b)cout Box maker:b.maker nheight:b.height nlwidth:n b.width Hnlength:b.length Hnvolume

44、:b.volume HnM;void setbox(box*pb)pb-volume=pb-height*pb-width*pb-length;)4.Many state lotteries use a variation of the simple lottery portrayed by Listing 7.4.Inthese variations you choose several numbers from one set,call them the field numbers.For example,you might select 5 numbers from the field

45、1-47).You also pick a singlenumber(called a mega number or a power ball,etc.)from a second range,such as1-27.To when the grand prize,you have to guess all the picks correctly.The chanceof winning is the product of the probability of picking all the field numbers times theprobability of picking the m

46、ega number.For instance,the odds of winning theexample described here is the product of the odds of picking 5 out of 47 correctlytimes the odds of picking 1 out of 27 correctly.Modify Listing 7.4 to calculate theodds of winning this kind of lottery.Stephen Prata 10 July 22,1999 Sample Solutions for

47、Programming Exercises in C+Primer Plus,3rd Edition/pe7-4.cpp odds against winning#include using namespace std;long double odds(unsigned numbers,unsigned picks);int main()(double total,choices;double mtotal;double oddsl,odds2;cout Enter total number of game card choices andnnumber of picks allowed fo

48、r the field:nn;while(cin total choices)&choices 0;n,p-)result=result*n/p;return result;)6.Write a program that uses the following functions:FilLarrayQ takes as arguments the name of an array of double and an array size.Itprompts the user to enter double values to be entered in the array.It ceases ta

49、kinginput when the array is full or when the user enters non-numeric input,and it returnsthe actual number of entries.Show airay()takes as arguments the name of an array of double and an array size anddisplays the contents of the array.Reverse_array()takes as arguments the name of an array of double

50、 and an array sizeand reverses the order of the values stored in the array.The program should fill an array,show the array,reverse the array,show the array,reverse all but the first and last elements of the array,and then show the array./pe7-6.cpp#include using namespace std;Stephen Prata 11 July 22