《C++大学教程第五版》课后习题答案Word格式文档下载.docx

《C++大学教程第五版》课后习题答案Word格式文档下载.docx

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};

//endclassGradeBook

类成员函数：

iostream>

cout;

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

setInstructorName（stringname）

instructorName=name;

//storetheinstructorname

}//endfunctionsetInstructorName

//functiontoretrievetheinstructorname

getInstructorName（）

returninstructorName;

}//endfunctiongetInstructorName

//displayawelcomemessageandtheinstructor'

sname

displayMessage（）

//displayawelcomemessagecontainingthecoursename

cout<

<

"

Welcometothegradebookfor\n"

<

getCourseName（）<

!

"

endl;

//displaytheinstructor'

Thiscourseispresentedby:

getInstructorName（）<

}//endfunctiondisplayMessage

测试文件：

//includedefinitionofclassGradeBookfromGradeBook.h

//functionmainbeginsprogramexecution

intmain（）

//createaGradeBookobject;

passacoursenameandinstructorname

GradeBookgradeBook（

CS101IntroductiontoC++Programming"

"

ProfessorSmith"

）;

//displayinitialvalueofinstructorNameofGradeBookobject

gradeBookinstructornameis:

gradeBook.getInstructorName（）<

\n\n"

;

//modifytheinstructorNameusingsetfunction

gradeBook.setInstructorName（"

AssistantProfessorBates"

//displaynewvalueofinstructorName

newgradeBookinstructornameis:

//displaywelcomemessageandinstructor'

gradeBook.displayMessage（）;

return0;

//indicatesuccessfultermination

}//endmain

3.12

类定义：

classAccount

Account（int）;

//constructorinitializesbalance

voidcredit（int）;

//addanamounttotheaccountbalance

voiddebit（int）;

//subtractanamountfromtheaccountbalance

intgetBalance（）;

//returntheaccountbalance

intbalance;

//datamemberthatstoresthebalance

//endclassAccount

Account.h"

//includedefinitionofclassAccount

//Accountconstructorinitializesdatamemberbalance

Account:

Account（intinitialBalance）

balance=0;

//assumethatthebalancebeginsat0

//ifinitialBalanceisgreaterthan0,setthisvalueasthe

//balanceoftheAccount;

otherwise,balanceremains0

if（initialBalance>

0）

balance=initialBalance;

//ifinitialBalanceisnegative,printerrormessage

if（initialBalance<

Error:

Initialbalancecannotbenegative.\n"

}//endAccountconstructor

//credit（add）anamounttotheaccountbalance

voidAccount:

credit（intamount）

balance=balance+amount;

//addamounttobalance

}//endfunctioncredit

//debit（subtract）anamountfromtheaccountbalance

debit（intamount）

if（amount>

balance）//debitamountexceedsbalance

Debitamountexceededaccountbalance.\n"

if（amount<

=balance）//debitamountdoesnotexceedbalance

balance=balance-amount;

}//endfunctiondebit

//returntheaccountbalance

intAccount:

getBalance（）

returnbalance;

//givesthevalueofbalancetothecallingfunction

}//endfunctiongetBalance

测试函数：

cin;

//includedefinitionofclassAccountfromAccount.h

Accountaccount1（50）;

//createAccountobject

Accountaccount2（25）;

//displayinitialbalanceofeachobject

account1balance:

$"

account1.getBalance（）<

account2balance:

account2.getBalance（）<

intwithdrawalAmount;

//storeswithdrawalamountreadfromuser

\nEnterwithdrawalamountforaccount1:

//prompt

cin>

>

withdrawalAmount;

//obtainuserinput

\nattemptingtosubtract"

withdrawalAmount

fromaccount1balance\n\n"

account1.debit（withdrawalAmount）;

//trytosubtractfromaccount1

//displaybalances

\nEnterwithdrawalamountforaccount2:

fromaccount2balance\n\n"

account2.debit（withdrawalAmount）;

//trytosubtractfromaccount2

3.13

//Invoiceclassdefinition

classInvoice

//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（）;

stringpartNumber;

//thenumberofthepartbeingsold

stringpartDescription;

//descriptionofthepartbeingsold

intquantity;

//howmanyoftheitemsarebeingsold

intpricePerItem;

//endclassInvoice

//includedefinitionofclassInvoicefromInvoice.h

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

setPartDescription（stringdescription）

partDescription=description;

}//endfunctionsetPartDescription

//getpartdescription

getPartDescription（）

returnpartDescription;

}//endfunctiongetPartDescription

//setquantity;

ifnotpositive,setto0

setQuantity（intcount）

if（count>

0）//ifquantityispositive

quantity=count;

//setquantitytocount

if（count<

=0）//ifquantityisnotpositive

{

quantity=0;

//setquantityto0

\nquantitycannotbenegative.quantitysetto0.\n"

}//endif

}//endfunctionsetQuantity

//getquantity

intInvoice:

getQuantity（）

returnquantity;

}//endfunctiongetQuantity

//setpriceperitem;

setPricePerItem（intprice）

if（price>

0）//ifpriceispositive

pricePerItem=price;

//setpricePerItemtoprice

if（price<

=0）//ifpriceisnotpositive

pricePerItem=0;

//setpricePerItemto0

\npricePerItemcannotbenegative."

pricePerItemsetto0.\n"

}//endfunctionsetPricePerItem

//getpriceperitem

getPricePerItem（）

returnpricePerItem;

}//endfunctiongetPricePerItem

//calulatesinvoiceamountbymultiplyingquantityxpriceperitem

getInvoiceAmount（）

returngetQuantity（）*getPricePerItem（）;

}//endfunctiongetInvoiceAmount

//createanInvoiceobject

Invoiceinvoice（"

12345"

Hammer"

100,5）;

//displaytheinvoicedatamembersandcalculatetheamount

Partnumber:

invoice.getPartNumber（）<

Partdescription:

invoice.getPartDescription（）<

Quanti