《C++大学教程第五版》课后习题答案(第3、9章)

1、3.11GradeBook类定义：#include / program uses C+ standard string classusing std:string;class GradeBookpublic: / constructor initializes course name and instructor name GradeBook( string, string ); void setCourseName( string ); / function to set the course name string getCourseName(); / function to retrie

2、ve the course name void setInstructorName( string ); / function to set instructor name string getInstructorName(); / function to retrieve instructor name void displayMessage(); / display welcome message and instructor nameprivate: string courseName; / course name for this GradeBook string instructor

3、Name; / instructor name for this GradeBook; / end class GradeBook类成员函数：#include using std:cout;using std:endl;#include GradeBook.h/ constructor initializes courseName and instructorName / with strings supplied as argumentsGradeBook:GradeBook( string course, string instructor ) setCourseName( course

4、); / initializes courseName setInstructorName( instructor ); / initialiZes instructorName / end GradeBook constructor/ function to set the course namevoid GradeBook:setCourseName( string name ) courseName = name; / store the course name / end function setCourseName/ function to retrieve the course n

5、amestring GradeBook:getCourseName() return courseName; / end function getCourseName/ function to set the instructor namevoid GradeBook:setInstructorName( string name ) instructorName = name; / store the instructor name推荐精选 / end function setInstructorName/ function to retrieve the instructor namestr

6、ing GradeBook:getInstructorName() return instructorName; / end function getInstructorName/ display a welcome message and the instructors namevoid GradeBook:displayMessage() / display a welcome message containing the course name cout Welcome to the grade book forn getCourseName() ! endl; / display th

7、e instructors name cout This course is presented by: getInstructorName() endl; / end function displayMessage测试文件：#include using std:cout; using std:endl;/ include definition of class GradeBook from GradeBook.h#include GradeBook.h/ function main begins program executionint main() / create a GradeBook

8、 object; pass a course name and instructor name GradeBook gradeBook( CS101 Introduction to C+ Programming, Professor Smith ); / display initial value of instructorName of GradeBook object cout gradeBook instructor name is: gradeBook.getInstructorName() nn; / modify the instructorName using set funct

9、ion gradeBook.setInstructorName( Assistant Professor Bates ); / display new value of instructorName cout new gradeBook instructor name is: gradeBook.getInstructorName() nn; / display welcome message and instructors name gradeBook.displayMessage(); return 0; / indicate successful termination / end ma

10、in3.12类定义：class Accountpublic:推荐精选 Account( int ); / constructor initializes balance void credit( int ); / add an amount to the account balance void debit( int ); / subtract an amount from the account balance int getBalance(); / return the account balanceprivate: int balance; / data member that stor

11、es the balance; / end class Account类成员函数：#include using std:cout;using std:endl;#include Account.h / include definition of class Account/ Account constructor initializes data member balanceAccount:Account( int initialBalance ) balance = 0; / assume that the balance begins at 0 / if initialBalance is

12、 greater than 0, set this value as the / balance of the Account; otherwise, balance remains 0 if ( initialBalance 0 ) balance = initialBalance; / if initialBalance is negative, print error message if ( initialBalance 0 ) cout Error: Initial balance cannot be negative.n balance ) / debit amount excee

13、ds balance cout Debit amount exceeded account balance.n endl; if ( amount = balance ) / debit amount does not exceed balance balance = balance - amount; / end function debit/ return the account balanceint Account:getBalance() return balance; / gives the value of balance to the calling function / end

14、 function getBalance测试函数：#include 推荐精选using std:cout;using std:cin;using std:endl;/ include definition of class Account from Account.h#include Account.h/ function main begins program executionint main() Account account1( 50 ); / create Account object Account account2( 25 ); / create Account object /

15、 display initial balance of each object cout account1 balance: $ account1.getBalance() endl; cout account2 balance: $ account2.getBalance() endl; int withdrawalAmount; / stores withdrawal amount read from user cout withdrawalAmount; / obtain user input cout nattempting to subtract withdrawalAmount f

16、rom account1 balancenn; account1.debit( withdrawalAmount ); / try to subtract from account1 / display balances cout account1 balance: $ account1.getBalance() endl; cout account2 balance: $ account2.getBalance() endl; cout withdrawalAmount; / obtain user input cout nattempting to subtract withdrawalA

17、mount from account2 balancenn; account2.debit( withdrawalAmount ); / try to subtract from account2 / display balances cout account1 balance: $ account1.getBalance() endl; cout account2 balance: $ account2.getBalance() endl; return 0; / indicate successful termination / end main3.13类定义：#include / pro

18、gram uses C+ standard string classusing std:string;推荐精选/ Invoice class definitionclass Invoicepublic: / constructor initializes the four data members Invoice( string, string, int, int ); / set and get functions for the four data members void setPartNumber( string ); / part number string getPartNumbe

19、r(); void setPartDescription( string ); / part description string getPartDescription(); void setQuantity( int ); / quantity int getQuantity(); void setPricePerItem( int ); / price per item int getPricePerItem(); / calculates invoice amount by multiplying quantity x price per item int getInvoiceAmoun

20、t(); private: string partNumber; / the number of the part being sold string partDescription; / description of the part being sold int quantity; / how many of the items are being sold int pricePerItem; / price per item; / end class Invoice类成员函数：#include using std:cout;using std:endl;/ include definit

21、ion of class Invoice from Invoice.h#include Invoice.h/ Invoice constructor initializes the classs four data membersInvoice:Invoice( string number, string description, int count, int price ) setPartNumber( number ); / store partNumber setPartDescription( description ); / store partDescription setQuan

22、tity( count ); / validate and store quantity setPricePerItem( price ); / validate and store pricePerItem / end Invoice constructor/ set part numbervoid Invoice:setPartNumber( string number ) partNumber = number; / no validation needed / end function setPartNumber推荐精选/ get part numberstring Invoice:g

23、etPartNumber() return partNumber; / end function getPartNumber/ set part descriptionvoid Invoice:setPartDescription( string description ) partDescription = description; / no validation needed / end function setPartDescription/ get part descriptionstring Invoice:getPartDescription() return partDescri

24、ption; / end function getPartDescription/ set quantity; if not positive, set to 0void Invoice:setQuantity( int count ) if ( count 0 ) / if quantity is positive quantity = count; / set quantity to count if ( count = 0 ) / if quantity is not positive quantity = 0; / set quantity to 0 cout 0 ) / if pri

25、ce is positive pricePerItem = price; / set pricePerItem to price if ( price = 0 ) / if price is not positive pricePerItem = 0; / set pricePerItem to 0 cout npricePerItem cannot be negative. pricePerItem set to 0.n; / end if / end function setPricePerItem/ get price per item推荐精选int Invoice:getPricePe

26、rItem() return pricePerItem; / end function getPricePerItem/ calulates invoice amount by multiplying quantity x price per itemint Invoice:getInvoiceAmount() return getQuantity() * getPricePerItem(); / end function getInvoiceAmount测试函数：#include using std:cout;using std:cin;using std:endl;/ include de

27、finition of class Invoice from Invoice.h#include Invoice.h/ function main begins program executionint main() / create an Invoice object Invoice invoice( 12345, Hammer, 100, 5 ); / display the invoice data members and calculate the amount cout Part number: invoice.getPartNumber() endl; cout Part desc

28、ription: invoice.getPartDescription() endl; cout Quantity: invoice.getQuantity() endl; cout Price per item: $ invoice.getPricePerItem() endl; cout Invoice amount: $ invoice.getInvoiceAmount() endl; / modify the invoice data members invoice.setPartNumber( 123456 ); invoice.setPartDescription( Saw );

29、invoice.setQuantity( -5 ); /negative quantity,so quantity set to 0 invoice.setPricePerItem( 10 ); cout nInvoice data members modified.nn; / display the modified invoice data members and calculate new amount cout Part number: invoice.getPartNumber() endl; cout Part description: invoice.getPartDescrip

30、tion() endl; cout Quantity: invoice.getQuantity() endl; cout Price per item: $ invoice.getPricePerItem() endl; cout Invoice amount: $ invoice.getInvoiceAmount() endl; return 0; / indicate successful termination / end main3.14类定义：#include / program uses C+ standard string class推荐精选using std:string;/

31、Employee class definitionclass Employee public: Employee( string, string, int ); / constructor sets data members void setFirstName( string ); / set first name string getFirstName(); / return first name void setLastName( string ); / set last name string getLastName(); / return last name void setMonth

32、lySalary( int ); / set weekly salary int getMonthlySalary(); / return weekly salaryprivate: string firstName; / Employees first name string lastName; / Employees last name int monthlySalary; / Employees salary per month; / end class Employee类成员函数：#include using std:cout;#include Employee.h / Employe

33、e class definition/ Employee constructor initializes the three data membersEmployee:Employee( string first, string last, int salary ) setFirstName( first ); / store first name setLastName( last ); / store last name setMonthlySalary( salary ); / validate and store monthly salary / end Employee constr

34、uctor/ set first namevoid Employee:setFirstName( string name ) firstName = name; / no validation needed / end function setFirstName/ return first namestring Employee:getFirstName() return firstName; / end function getFirstName/ set last namevoid Employee:setLastName( string name ) lastName = name; /

35、 no validation needed / end function setLastName/ return last name推荐精选string Employee:getLastName() return lastName; / end function getLastName/ set monthly salary; if not positive, set to 0.0void Employee:setMonthlySalary( int salary ) if ( salary 0 ) / if salary is positive monthlySalary = salary;

36、 / set monthlySalary to salary if ( salary = 0 ) / if salary is not positive monthlySalary = 0; / set monthlySalary to 0.0 / end function setMonthlySalary/ return monthly salaryint Employee:getMonthlySalary() return monthlySalary; / end function getMonthlySalary测试函数：#include using std:cout;using std

37、:endl;#include Employee.h / include definition of class Employee/ function main begins program executionint main() / create two Employee objects Employee employee1( Lisa, Roberts, 4500 ); Employee employee2( Mark, Stein, 4000 ); / display each Employees yearly salary cout Employees yearly salaries:

38、endl; / retrieve and display employee1s monthly salary multiplied by 12 int monthlySalary1 = employee1.getMonthlySalary(); cout employee1.getFirstName() employee1.getLastName() : $ monthlySalary1 * 12 endl; / retrieve and display employee2s monthly salary multiplied by 12 int monthlySalary2 = employ

39、ee2.getMonthlySalary(); cout employee2.getFirstName() employee2.getLastName() : $ monthlySalary2 * 12 endl; / give each Employee a 10% raise employee1.setMonthlySalary( monthlySalary1 * 1.1 ); employee2.setMonthlySalary( monthlySalary2 * 1.1 ); / display each Employees yearly salary again cout nEmpl

40、oyees yearly salaries after 10% raise: endl; / retrieve and display employee1s monthly salary multiplied by 12推荐精选 monthlySalary1 = employee1.getMonthlySalary(); cout employee1.getFirstName() employee1.getLastName() : $ monthlySalary1 * 12 endl; monthlySalary2 = employee2.getMonthlySalary(); cout em

41、ployee2.getFirstName() employee2.getLastName() : $ monthlySalary2 * 12 endl; return 0; / indicate successful termination / end main3.15类定义：class Date public: Date( int, int, int ); / constructor initializes data members void setMonth( int ); / set month int getMonth(); / return month void setDay( in

42、t ); / set day int getDay(); / return day void setYear( int ); / set year int getYear(); / return year void displayDate(); / displays date in mm/dd/yyyy formatprivate: int month; / the month of the date int day; / the day of the date int year; / the year of the date; / end class Date类成员函数：#include u

43、sing std:cout;using std:endl;#include Date.h / include definition of class Date from Date.h/ Date constructor that initializes the three data members;/ assume values provided are correct (really should validate)Date:Date( int m, int d, int y ) setMonth( m ); setDay( d ); setYear( y ); / end Date con

44、structor / set monthvoid Date:setMonth( int m ) month = m; if ( month 12 ) month = 1; / end function setMonth/ return monthint Date:getMonth() return month; / end function getMonth/ set dayvoid Date:setDay( int d ) day = d; / end function setDay/ return dayint Date:getDay() return day; / end functio

45、n getDay/ set yearvoid Date:setYear( int y ) year = y; / end function setYear/ return yearint Date:getYear() return year; / end function getYear/ print Date in the format mm/dd/yyyyvoid Date:displayDate() cout month / day / year endl; / end function displayDate测试函数：#include using std:cout;using std:

46、endl;#include Date.h / include definition of class Date from Date.h/ function main begins program executionint main() Date date( 5, 6, 1981 ); / create a Date object for May 6, 1981 / display the values of the three Date data members推荐精选 cout Month: date.getMonth() endl; cout Day: date.getDay() endl

47、; cout Year: date.getYear() endl; cout nOriginal date: endl; date.displayDate(); / output the Date as 5/6/1981 / modify the Date date.setMonth( 13 ); / invalid month date.setDay( 1 ); date.setYear( 2005 ); cout nNew date: endl; date.displayDate(); / output the modified date (1/1/2005) return 0; / in

48、dicate successful termination / end main9.05类定义：#ifndef COMPLEX_H#define COMPLEX_Hclass Complex public: Complex( double = 0.0, double = 0.0 ); / default constructor Complex add( const Complex & ); / function add Complex subtract( const Complex & ); / function subtract void printComplex(); / print complex number format void setComplexNumber( double, double ); / set complex number private: double realPart; double imaginaryPart; / end class Complex #endif类成员函数：#include