《C++大学教程第五版》课后习题答案.docx

《C++大学教程第五版》课后习题答案.docx

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《C++大学教程第五版》课后习题答案

C++大学基础教程课后答案（DEITEL）版

3.11

GradeBook类定义：

#include//programusesC++standardstringclass

usingstd:

:

string;

classGradeBook

{

public:

//constructorinitializescoursenameandinstructorname

GradeBook（string,string）;

voidsetCourseName（string）;//functiontosetthecoursename

stringgetCourseName（）;//functiontoretrievethecoursename

voidsetInstructorName（string）;//functiontosetinstructorname

stringgetInstructorName（）;//functiontoretrieveinstructorname

voiddisplayMessage（）;//displaywelcomemessageandinstructorname

private:

stringcourseName;//coursenameforthisGradeBook

stringinstructorName;//instructornameforthisGradeBook

};//endclassGradeBook

类成员函数：

#include

usingstd:

:

cout;

usingstd:

:

endl;

#include"GradeBook.h"

//constructorinitializescourseNameandinstructorName

//withstringssuppliedasarguments

GradeBook:

:

GradeBook（stringcourse,stringinstructor）

{

setCourseName（course）;//initializescourseName

setInstructorName（instructor）;//initialiZesinstructorName

}//endGradeBookconstructor

//functiontosetthecoursename

voidGradeBook:

:

setCourseName（stringname）

{

courseName=name;//storethecoursename

}//endfunctionsetCourseName

//functiontoretrievethecoursename

stringGradeBook:

:

getCourseName（）

{

returncourseName;

}//endfunctiongetCourseName

//functiontosettheinstructorname

voidGradeBook:

:

setInstructorName（stringname）

{

instructorName=name;//storetheinstructorname

}//endfunctionsetInstructorName

//functiontoretrievetheinstructorname

stringGradeBook:

:

getInstructorName（）

{

returninstructorName;

}//endfunctiongetInstructorName

//displayawelcomemessageandtheinstructor'sname

voidGradeBook:

:

displayMessage（）

{

//displayawelcomemessagecontainingthecoursename

cout<<"Welcometothegradebookfor\n"<

"

<

//displaytheinstructor'sname

cout<<"Thiscourseispresentedby:

"<

}//endfunctiondisplayMessage

测试文件：

#include

usingstd:

:

cout;

usingstd:

:

endl;

//includedefinitionofclassGradeBookfromGradeBook.h

#include"GradeBook.h"

//functionmainbeginsprogramexecution

intmain（）

{

//createaGradeBookobject;passacoursenameandinstructorname

GradeBookgradeBook（

"CS101IntroductiontoC++Programming","ProfessorSmith"）;

//displayinitialvalueofinstructorNameofGradeBookobject

cout<<"gradeBookinstructornameis:

"

<

//modifytheinstructorNameusingsetfunction

gradeBook.setInstructorName（"AssistantProfessorBates"）;

//displaynewvalueofinstructorName

cout<<"newgradeBookinstructornameis:

"

<

//displaywelcomemessageandinstructor'sname

gradeBook.displayMessage（）;

return0;//indicatesuccessfultermination

}//endmain

3.12

类定义：

classAccount

{

public:

Account（int）;//constructorinitializesbalance

voidcredit（int）;//addanamounttotheaccountbalance

voiddebit（int）;//subtractanamountfromtheaccountbalance

intgetBalance（）;//returntheaccountbalance

private:

intbalance;//datamemberthatstoresthebalance

};//endclassAccount

类成员函数：

#include

usingstd:

:

cout;

usingstd:

:

endl;

#include"Account.h"//includedefinitionofclassAccount

//Accountconstructorinitializesdatamemberbalance

Account:

:

Account（intinitialBalance）

{

balance=0;//assumethatthebalancebeginsat0

//ifinitialBalanceisgreaterthan0,setthisvalueasthe

//balanceoftheAccount;otherwise,balanceremains0

if（initialBalance>0）

balance=initialBalance;

//ifinitialBalanceisnegative,printerrormessage

if（initialBalance<0）

cout<<"Error:

Initialbalancecannotbenegative.\n"<

}//endAccountconstructor

//credit（add）anamounttotheaccountbalance

voidAccount:

:

credit（intamount）

{

balance=balance+amount;//addamounttobalance

}//endfunctioncredit

//debit（subtract）anamountfromtheaccountbalance

voidAccount:

:

debit（intamount）

{

if（amount>balance）//debitamountexceedsbalance

cout<<"Debitamountexceededaccountbalance.\n"<

if（amount<=balance）//debitamountdoesnotexceedbalance

balance=balance-amount;

}//endfunctiondebit

//returntheaccountbalance

intAccount:

:

getBalance（）

{

returnbalance;//givesthevalueofbalancetothecallingfunction

}//endfunctiongetBalance

测试函数：

#include

usingstd:

:

cout;

usingstd:

:

cin;

usingstd:

:

endl;

//includedefinitionofclassAccountfromAccount.h

#include"Account.h"

//functionmainbeginsprogramexecution

intmain（）

{

Accountaccount1（50）;//createAccountobject

Accountaccount2（25）;//createAccountobject

//displayinitialbalanceofeachobject

cout<<"account1balance:

$"<

cout<<"account2balance:

$"<

intwithdrawalAmount;//storeswithdrawalamountreadfromuser

cout<<"\nEnterwithdrawalamountforaccount1:

";//prompt

cin>>withdrawalAmount;//obtainuserinput

cout<<"\nattemptingtosubtract"<

<<"fromaccount1balance\n\n";

account1.debit（withdrawalAmount）;//trytosubtractfromaccount1

//displaybalances

cout<<"account1balance:

$"<

cout<<"account2balance:

$"<

cout<<"\nEnterwithdrawalamountforaccount2:

";//prompt

cin>>withdrawalAmount;//obtainuserinput

cout<<"\nattemptingtosubtract"<

<<"fromaccount2balance\n\n";

account2.debit（withdrawalAmount）;//trytosubtractfromaccount2

//displaybalances

cout<<"account1balance:

$"<

cout<<"account2balance:

$"<

return0;//indicatesuccessfultermination

}//endmain

3.13

类定义：

#include//programusesC++standardstringclass

usingstd:

:

string;

//Invoiceclassdefinition

classInvoice

{

public:

//constructorinitializesthefourdatamembers

Invoice（string,string,int,int）;

//setandgetfunctionsforthefourdatamembers

voidsetPartNumber（string）;//partnumber

stringgetPartNumber（）;

voidsetPartDescription（string）;//partdescription

stringgetPartDescription（）;

voidsetQuantity（int）;//quantity

intgetQuantity（）;

voidsetPricePerItem（int）;//priceperitem

intgetPricePerItem（）;

//calculatesinvoiceamountbymultiplyingquantityxpriceperitem

intgetInvoiceAmount（）;

private:

stringpartNumber;//thenumberofthepartbeingsold

stringpartDescription;//descriptionofthepartbeingsold

intquantity;//howmanyoftheitemsarebeingsold

intpricePerItem;//priceperitem

};//endclassInvoice

类成员函数：

#include

usingstd:

:

cout;

usingstd:

:

endl;

//includedefinitionofclassInvoicefromInvoice.h

#include"Invoice.h"

//Invoiceconstructorinitializestheclass'sfourdatamembers

Invoice:

:

Invoice（stringnumber,stringdescription,intcount,

intprice）

{

setPartNumber（number）;//storepartNumber

setPartDescription（description）;//storepartDescription

setQuantity（count）;//validateandstorequantity

setPricePerItem（price）;//validateandstorepricePerItem

}//endInvoiceconstructor

//setpartnumber

voidInvoice:

:

setPartNumber（stringnumber）

{

partNumber=number;//novalidationneeded

}//endfunctionsetPartNumber

//getpartnumber

stringInvoice:

:

getPartNumber（）

{

returnpartNumber;

}//endfunctiongetPartNumber

//setpartdescription

voidInvoice:

:

setPartDescription（stringdescription）

{

partDescription=description;//novalidationneeded

}//endfunctionsetPartDescription

//getpartdescription

stringInvoice:

:

getPartDescription（）

{

returnpartDescription;

}//endfunctiongetPartDescription

//setquantity;ifnotpositive,setto0

voidInvoice:

:

setQuantity（intcount）

{

if（count>0）//ifquantityispositive

quantity=count;//setquantitytocount

if（count<=0）//ifquantityisnotpositive

{

quantity=0;//setquantityto0

cout<<"\nquantitycannotbenegative.quantitysetto0.\n";

}//endif

}//endfunctionsetQuantity

//getquantity

intInvoice:

:

getQuantity（）

{

returnquantity;

}//endfunctiongetQuantity

//setpriceperitem;ifnotpositive,setto0

voidInvoice:

:

setPricePerItem（intprice）

{

if（price>0）//ifpriceispositive

pricePerItem=price;//setpricePerItemtoprice

if（price<=0）//ifpriceisnotpositive

{

pricePerItem=0;//setpricePerItemto0

cout<<"\npricePerItemcannotbenegative."

<<"pricePerItemsetto0.\n";

}//endif

}//endfunctionsetPricePerItem

//getpriceperitem

intInvoice:

:

getPricePerItem（）

{

returnpricePerItem;

}//endfunctiongetPricePerItem

//calulatesinvoiceamountbymultiplyingquantityxpriceperitem

intInvoice:

:

getInvoiceAmount（）

{

returngetQuantity（）*getPricePerItem（）;

}//endfunctiongetInvoiceAmount

测试函数：

#include

usingstd:

:

cout;

usingstd:

:

cin;

usingstd:

:

endl;

//includedefinitionofclassInvoicefromInvoice.h

#include"Invoice.h"

//functionmainbeginsprogramexecution

intmain（）

{

//createanInvoiceobject

Invoiceinvoice（"12345","Hammer",100,5）;

//displaytheinvoicedatamembersandcalculatetheamount

cout<<"Partnumber:

"<

cout<<"Partdescription:

"<

cout<<"Quanti