1、C+ 大學基礎教程 課后答案（DEITEL）版3.11GradeBook類定義：#include <string> / 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

2、 getCourseName(); / function to retrieve 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 nam

3、e for this GradeBook string instructorName; / instructor name for this GradeBook; / end class GradeBook類成員函數：#include <iostream>using std:cout;using std:endl;#include "GradeBook.h"/ constructor initializes courseName and instructorName / with strings supplied as argumentsGradeBook:Gr

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

5、me / end function setCourseName/ function to retrieve the course namestring GradeBook:getCourseName() return courseName; / end function getCourseName/ function to set the instructor namevoid GradeBook:setInstructorName( string name ) instructorName = name; / store the instructor name / end function

6、setInstructorName/ function to retrieve the instructor namestring GradeBook:getInstructorName() return instructorName; / end function getInstructorName/ display a welcome message and the instructor's namevoid GradeBook:displayMessage() / display a welcome message containing the course name cout

7、<< "Welcome to the grade book forn" << getCourseName() << "!" << endl; / display the instructor's name cout << "This course is presented by: " << getInstructorName() << endl; / end function displayMessage測試文件：#include <io

8、stream>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 object; pass a course name and instructor name GradeBook gradeBook( "CS101 Introduction to C+

9、Programming", "Professor Smith" ); / display initial value of instructorName of GradeBook object cout << "gradeBook instructor name is: " << gradeBook.getInstructorName() << "nn" / modify the instructorName using set function gradeBook.setInstruct

10、orName( "Assistant Professor Bates" ); / display new value of instructorName cout << "new gradeBook instructor name is: " << gradeBook.getInstructorName() << "nn" / display welcome message and instructor's name gradeBook.displayMessage(); return 0;

11、 / indicate successful termination / end main3.12類定義：class Accountpublic: 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 balanceprivat

12、e: int balance; / data member that stores the balance; / end class Account類成員函數：#include <iostream>using std:cout;using std:endl;#include "Account.h" / include definition of class Account/ Account constructor initializes data member balanceAccount:Account( int initialBalance ) balanc

13、e = 0; / assume that the balance begins at 0 / if initialBalance is 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 ) co

14、ut << "Error: Initial balance cannot be negative.n" << endl; / end Account constructor/ credit (add) an amount to the account balancevoid Account:credit( int amount ) balance = balance + amount; / add amount to balance / end function credit/ debit (subtract) an amount from the

15、account balancevoid Account:debit( int amount ) if ( amount > balance ) / debit amount exceeds balance cout << "Debit amount exceeded account balance.n" << endl; if ( amount <= balance ) / debit amount does not exceed balance balance = balance - amount; / end function deb

16、it/ return the account balanceint Account:getBalance() return balance; / gives the value of balance to the calling function / end function getBalance測試函數：#include <iostream>using std:cout;using std:cin;using std:endl;/ include definition of class Account from Account.h#include "Account.h&

17、quot;/ function main begins program executionint main() Account account1( 50 ); / create Account object Account account2( 25 ); / create Account object / display initial balance of each object cout << "account1 balance: $" << account1.getBalance() << endl; cout << &

18、quot;account2 balance: $" << account2.getBalance() << endl; int withdrawalAmount; / stores withdrawal amount read from user cout << "nEnter withdrawal amount for account1: " / prompt cin >> withdrawalAmount; / obtain user input cout << "nattempting t

19、o subtract " << withdrawalAmount << " from account1 balancenn" account1.debit( withdrawalAmount ); / try to subtract from account1 / display balances cout << "account1 balance: $" << account1.getBalance() << endl; cout << "account2 ba

20、lance: $" << account2.getBalance() << endl; cout << "nEnter withdrawal amount for account2: " / prompt cin >> withdrawalAmount; / obtain user input cout << "nattempting to subtract " << withdrawalAmount << " from account2 balanc

21、enn" account2.debit( withdrawalAmount ); / try to subtract from account2 / display balances cout << "account1 balance: $" << account1.getBalance() << endl; cout << "account2 balance: $" << account2.getBalance() << endl; return 0; / indicat

22、e successful termination / end main3.13類定義：#include <string> / program uses C+ standard string classusing std:string;/ Invoice class definitionclass Invoicepublic: / constructor initializes the four data members Invoice( string, string, int, int ); / set and get functions for the four data mem

23、bers void setPartNumber( string ); / part number string getPartNumber(); void setPartDescription( string ); / part description string getPartDescription(); void setQuantity( int ); / quantity int getQuantity(); void setPricePerItem( int ); / price per item int getPricePerItem(); / calculates invoice

24、 amount by multiplying quantity x price per item int getInvoiceAmount(); 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 I

25、nvoice類成員函數：#include <iostream>using std:cout;using std:endl;/ include definition of class Invoice from Invoice.h#include "Invoice.h"/ Invoice constructor initializes the class's four data membersInvoice:Invoice( string number, string description, int count, int price ) setPartNu

26、mber( number ); / store partNumber setPartDescription( description ); / store partDescription setQuantity( count ); / validate and store quantity setPricePerItem( price ); / validate and store pricePerItem / end Invoice constructor/ set part numbervoid Invoice:setPartNumber( string number ) partNumb

27、er = number; / no validation needed / end function setPartNumber/ get part numberstring Invoice:getPartNumber() return partNumber; / end function getPartNumber/ set part descriptionvoid Invoice:setPartDescription( string description ) partDescription = description; / no validation needed / end funct

28、ion setPartDescription/ get part descriptionstring Invoice:getPartDescription() return partDescription; / 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 co

29、unt if ( count <= 0 ) / if quantity is not positive quantity = 0; / set quantity to 0 cout << "nquantity cannot be negative. quantity set to 0.n" / end if / end function setQuantity/ get quantityint Invoice:getQuantity() return quantity; / end function getQuantity/ set price per i

30、tem; if not positive, set to 0void Invoice:setPricePerItem( int price ) if ( price > 0 ) / if price 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 n

31、egative. " << "pricePerItem set to 0.n" / end if / end function setPricePerItem/ get price per itemint Invoice:getPricePerItem() return pricePerItem; / end function getPricePerItem/ calulates invoice amount by multiplying quantity x price per itemint Invoice:getInvoiceAmount() r

32、eturn getQuantity() * getPricePerItem(); / end function getInvoiceAmount測試函數：#include <iostream>using std:cout;using std:cin;using std:endl;/ include definition of class Invoice from Invoice.h#include "Invoice.h"/ function main begins program executionint main() / create an Invoice o

33、bject Invoice invoice( "12345", "Hammer", 100, 5 ); / display the invoice data members and calculate the amount cout << "Part number: " << invoice.getPartNumber() << endl; cout << "Part description: " << invoice.getPartDescription

34、() << endl; cout << "Quantity: " << invoice.getQuantity() << endl; cout << "Price per item: $" << invoice.getPricePerItem() << endl; cout << "Invoice amount: $" << invoice.getInvoiceAmount() << endl; / modify t

35、he invoice data members invoice.setPartNumber( "123456" ); invoice.setPartDescription( "Saw" ); invoice.setQuantity( -5 ); /negative quantity,so quantity set to 0 invoice.setPricePerItem( 10 ); cout << "nInvoice data members modified.nn" / display the modified inv

36、oice data members and calculate new amount cout << "Part number: " << invoice.getPartNumber() << endl; cout << "Part description: " << invoice.getPartDescription() << endl; cout << "Quantity: " << invoice.getQuantity() <

37、;< endl; cout << "Price per item: $" << invoice.getPricePerItem() << endl; cout << "Invoice amount: $" << invoice.getInvoiceAmount() << endl; return 0; / indicate successful termination / end main3.14類定義：#include <string> / program use

38、s C+ standard string classusing std:string;/ 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 ge

39、tLastName(); / return last name void setMonthlySalary( int ); / set weekly salary int getMonthlySalary(); / return weekly salaryprivate: string firstName; / Employee's first name string lastName; / Employee's last name int monthlySalary; / Employee's salary per month; / end class Employe

40、e類成員函數：#include <iostream>using std:cout;#include "Employee.h" / Employee 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 na

41、me setMonthlySalary( salary ); / validate and store monthly salary / end Employee constructor/ set first namevoid Employee:setFirstName( string name ) firstName = name; / no validation needed / end function setFirstName/ return first namestring Employee:getFirstName() return firstName; / end functio

42、n getFirstName/ set last namevoid Employee:setLastName( string name ) lastName = name; / no validation needed / end function setLastName/ return last namestring Employee:getLastName() return lastName; / end function getLastName/ set monthly salary; if not positive, set to 0.0void Employee:setMonthly

43、Salary( int salary ) if ( salary > 0 ) / if salary is positive monthlySalary = salary; / 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(

44、) return monthlySalary; / end function getMonthlySalary測試函數：#include <iostream>using std:cout;using std:endl;#include "Employee.h" / include definition of class Employee/ function main begins program executionint main() / create two Employee objects Employee employee1( "Lisa&quo

45、t;, "Roberts", 4500 ); Employee employee2( "Mark", "Stein", 4000 ); / display each Employee's yearly salary cout << "Employees' yearly salaries: " << endl; / retrieve and display employee1's monthly salary multiplied by 12 int monthlySa

46、lary1 = employee1.getMonthlySalary(); cout << employee1.getFirstName() << " " << employee1.getLastName() << ": $" << monthlySalary1 * 12 << endl; / retrieve and display employee2's monthly salary multiplied by 12 int monthlySalary2 = employ

47、ee2.getMonthlySalary(); cout << employee2.getFirstName() << " " << employee2.getLastName() << ": $" << monthlySalary2 * 12 << endl; / give each Employee a 10% raise employee1.setMonthlySalary( monthlySalary1 * 1.1 ); employee2.setMonthlySalary(

48、 monthlySalary2 * 1.1 ); / display each Employee's yearly salary again cout << "nEmployees' yearly salaries after 10% raise: " << endl; / retrieve and display employee1's monthly salary multiplied by 12 monthlySalary1 = employee1.getMonthlySalary(); cout << em

49、ployee1.getFirstName() << " " << employee1.getLastName() << ": $" << monthlySalary1 * 12 << endl; monthlySalary2 = employee2.getMonthlySalary(); cout << employee2.getFirstName() << " " << employee2.getLastName() << &

50、quot;: $" << monthlySalary2 * 12 << endl; return 0; / indicate successful termination / end main3.15類定義：class Date public: Date( int, int, int ); / constructor initializes data members void setMonth( int ); / set month int getMonth(); / return month void setDay( int ); / set day int

51、 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類成員函數：#include <iostream>usi

52、ng 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 ); / en

53、d Date constructor / set monthvoid Date:setMonth( int m ) month = m; if ( month < 1 ) month = 1; 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

54、dayint Date:getDay() return day; / end function 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 << '/' <<

55、 day << '/' << year << endl; / end function displayDate測試函數：#include <iostream>using std:cout;using std:endl;#include "Date.h" / include definition of class Date from Date.h/ function main begins program executionint main() Date date( 5, 6, 1981 ); / create

56、a Date object for May 6, 1981 / display the values of the three Date data members cout << "Month: " << date.getMonth() << endl; cout << "Day: " << date.getDay() << endl; cout << "Year: " << date.getYear() << endl; co

57、ut << "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 (

58、1/1/2005) return 0; / indicate successful termination / end main9.05類定義：#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類成員函數：#i