Question

The following class diagrams are designed for a restaurant that also provides home delivery services. Study the given class diagrams, additional information and answer questions that follow: MobileContract PhoneModel planID string f contractiD: string modelNumber: int colour: string marketPrice: double phone: PhoneModel + MobileContract(string, string PhoneModel) +display: void + calcPlanPhonePrice: double + PhoneModel int, string, double) +display) void +getMarketPrice): double act rsPhoneDiscount: double + RoadshowContract(string, string PhoneModel, double) +display: void +calcPlanPhonePrice):double Additional Information: Class MobileContract string. Constructor. The are, Plan type D PhoneModel) (planID), Contract ID (contractID) and Phone model (phoneMode). Valid plan Ds are "planA". "planB and "planC Calculates phone price under contact plan by applying discounts as follows. "planA"-> 20% discount from market price. planB"-30% discount from market price. calcPlanPhonePrice():double lanC”-> 35% discount from market price Uses cout to display its respective data members. Invoke display method in PhoneModel class to display display(: void details. Class RoadshowContract RoadshowContract(string, string.Constructor. The parameters are, Plan type D PhoneModel, double): planID), Contract ID (contractID), Phone model (phoneModel) and Road show Discount Amount (rsPhoneDiscount). Invokes the base class constructor with the ar Invokes the base class calcPlanPhonePrice) and subtracts the rsPhoneDiscount from the retum value of base class calcPlanPhonePrice). Returns the final pass-in t to set base class data members calcPlanPhonePrice)double hone price after discount Uses cout to display its respective data members. Invoke display method in PhoneModel class to display display): void one details. Class PhoneModel PhoneModel (string, string. double: Constructor. The parameters are, Phone Model (modelNımber). Phone Colour (colour) and Markeit Price of the Phone (marketPrice). The constructor assumes has the following default values: modelNumber_"S900". colour-"Black", marketPrice= 1200.0 Uses cout to display its respective data members. marketPrice should be displayed with two decimal display 0:void aces Accessor methid. Returns the market Price etPrice0:double

Answer 1

Solution: a) Method Overloading: . This happens when more than one methods have same name, but different signature om The difference signature can be in difference in parameter number, parameter types, parameter order, and output types. Method Overriding: .Here the methods have same signature, but will be in different classes to avoid the same class same method signature error . The method overriding is occurring by overriding the execution of one method over the other. b-e # include<iostream> # include<string> # include<vector> using namespace std; class PhoneModel

Data members string modelNumber; string colour; double marketPrice; public: // Functiobs PhoneModel (string num-"S900", string col-"Black", double price-1200.0) void display ) double getMarketprice ); /7 Constructor PhoneModel:: PhoneModel (string num, string col,double price) modelNumber-rn colour-col marketPrice-price; =num; /7 Display void PhoneModel:: display () coutくく"Model Number: "くくmode 1Numberくくendl ; coutくぐColour : "くくcolourくくendl; coutくく"Market Price: "くくmarketPriceくくendl; // Get market price double PhoneModel: :getMarketprice () return marketPrice;

Class MobileContract class MobileContract string planID; string contractID; PhoneModel phone; public: MobileContract (string ID, string conID, PhoneModel ph) void display ) virtual double calcPlanPhonePrice (); /7 Derived class class RoadshowContract: public MobileContract double rsPhoneDiscount public: RoadshowContract (string planID, string contractID, PhoneModel phone, double rsdiscount) double calcPlanPhonePrice () void display ) /7 Constructor MobileContract: MobileContract (string ID, string conID, PhoneModel ph) planID ID;

contractID-conID phone-ph; void MobileContract:: display () coutくく"Plan ID: "くくplanTD<<endl ; coutくぐContract ID: "くくcontract!D<<endl; phone.display); // calculate price double MobilecContract: : calcPlanPhonePrice () if (planID"planA" ) return 0.2 phone.getMarketprice () else if (planID"planB") return 0.3*phone . getMarketprice(); else if (planID"planc" return 0.35*phone.getMarketprice () // Constructor RoadshowContract: : Roadshowcontract (string planID, string contractID, PhoneModel phone, double rsdiscount) :MobileContract (planID, contractID, phone) rs PhoneDis count=rsdiscount;

/7 Calculate price double RoadshowContract: : calcPlanPhonePrice () double val=MobileContract: calcPlanPhone Price(); val-val-rsPhoneDiscount; return val; /7 Display void RoadshowContract: :display () MobileContract::display); coutくく"Phone discount: "くくrsPhoneDiscountくくendl; int main() PhoneModel ph-PhoneModel ("u800", "red",99.0) PhoneModel ph1-PhoneModel ("u600", "black",199.0); PhoneModel ph2-PhoneModel ("u900", "green", 299.0); PhoneModel ph3; mobcon.push_back (new MobileContract ("planA", "1", ph)); MobileContract ("planB", "2", phl)) RoadshowContract ("planA", "2", ph2,10)) RoadshowContract ("planB", "2", ph3,10)) mobcon.push back (new mobcon.push _back (new mobcon.push_back (new

for (int i-0;i<4; i++) mobcon.at (i)->display); cout<<mobcon.at (i) calcplanPhonePrice ()<<endl system ("pause") return 0 Output Plan ID: planA Contract ID:1 Model Number u800 Col ur : red Market Price: 99 19.8 Plan ID planB Contract ID::2 Model Number u600 Colour black Market Price: 199 59.7 Plan ID: planA Contract ID::2 Model Number u900 Colour: green Market Price: 299 49.8 Plan ID planB

Contract ID: 2 Model Number S900 Colour: Black Market Price: 1200 350 Press any key to continue . . -

Executable C++ Code:

#include<iostream>

#include<string>

#include<vector>

using namespace std;

//.................Question b...............................

class PhoneModel

{

// Data members

string modelNumber;

string colour;

double marketPrice;

public:

// Functiobs

PhoneModel(string num="S900",string col="Black",double price=1200.0);

void display();

double getMarketprice();

};

// Constructor

PhoneModel::PhoneModel(string num,string col,double price)

{

modelNumber=num;

colour=col;

marketPrice=price;

}

// Display

void PhoneModel:: display()

{

cout<<"Model Number: "<<modelNumber<<endl;

cout<<"Colour: "<<colour<<endl;

cout<<"Market Price: "<<marketPrice<<endl;

}

// Get market price

double PhoneModel::getMarketprice()

{

return marketPrice;

}

//.................Question c...............................

// Class MobileContract

class MobileContract

{

string planID;

string contractID;

PhoneModel phone;

public:

MobileContract(string ID,string conID, PhoneModel ph);

void display();

virtual double calcPlanPhonePrice();

};

// Derived class

class RoadshowContract: public MobileContract

{

double rsPhoneDiscount;

public:

RoadshowContract(string planID,string contractID, PhoneModel phone,double rsdiscount);

double calcPlanPhonePrice();

void display();

};

//.................Question d...............................

// Constructor

MobileContract::MobileContract(string ID,string conID, PhoneModel ph)

{

planID=ID;

contractID=conID;

phone=ph;

}

void MobileContract:: display()

{

cout<<"Plan ID: "<<planID<<endl;

cout<<"Contract ID: "<<contractID<<endl;

phone.display();

}

// Calculate price

double MobileContract::calcPlanPhonePrice()

{

if(planID=="planA")

{

return 0.2*phone.getMarketprice();

}

else if(planID=="planB")

{

return 0.3*phone.getMarketprice();

}

else if(planID=="planC")

{

return 0.35*phone.getMarketprice();

}

}

// Constructor

RoadshowContract::RoadshowContract(string planID,string contractID, PhoneModel phone,double rsdiscount):MobileContract(planID,contractID,phone)

{

rsPhoneDiscount=rsdiscount;

}

// Calculate rice

double RoadshowContract::calcPlanPhonePrice()

{

double val=MobileContract::calcPlanPhonePrice();

val=val-rsPhoneDiscount;

return val;

}

// Dislay

void RoadshowContract::display()

{

MobileContract::display();

cout<<"Phone discount: "<<rsPhoneDiscount<<endl;

}

//.................Question e...............................

int main()

{

vector<MobileContract *>mobcon;

PhoneModel ph=PhoneModel("u800","red",99.0);

PhoneModel ph1=PhoneModel("u600","black",199.0);

PhoneModel ph2=PhoneModel("u900","green",299.0);

PhoneModel ph3;

mobcon.push_back(new MobileContract("planA","1",ph));

mobcon.push_back(new MobileContract("planB","2",ph1));

mobcon.push_back(new RoadshowContract("planA","2",ph2,10));

mobcon.push_back(new RoadshowContract("planB","2",ph3,10));

for(int i=0;i<4;i++)

{

mobcon.at(i)->display();

cout<<mobcon.at(i)->calcPlanPhonePrice()<<endl;

}

system("pause");

return 0;

}