UNIVERSITY OF MANAGEMENT AND
TECHNOLOGY
COURSE: OOPS (THEORY)
TOPIC: ASSIGINMENT # 3 & 4
NAME SAAD ALI
DEPARTMENT BS-SE
SECTION A
ROLL NO 043
SUBMITTED TO : MA’AM AQSA
ASSIGNMENT
ScenArio – online Food ordering SySteM
This system models a simple food delivery service. A Customer can place an order and a Delivery
Rider delivers it. Both share some common information like name and ID, so we use a base class
Person, and then create Customer and DeliveryRider classes that inherit from it.
A friend function is used to display private customer address. A friend class tracks rider details.
FunctionAl Flow
• Objects are created using constructors
• Private members like address and vehicle type are set through constructors
• Friend function shows private customer data
• Friend class accesses private delivery rider info
• Inheritance is used from Person → Customer and DeliveryRider
ooP concePtS uSed
Concept How It Was Used
Classes & Objects Person, Customer, DeliveryRider, OrderSystem
Constructor All classes use constructors to set values
Inheritance Customer and DeliveryRider inherit from Person
Encapsulation address and vehicleType are private
Friend Function showCustomerAddress() accesses private address of customer
Friend Class OrderSystem accesses private data of delivery rider
code iMPleMentAtion
#include <iostream>
using namespace std;
// Forward declaration
class Customer;
// Friend function declaration
void showCustomerAddress(Customer c);
// Base Class: Person
class Person {
protected:
string name;
int id;
public:
Person(string n, int i) {
name = n;
id = i;
}
void showBasicInfo() {
cout << "Name: " << name << ", ID: " << id << endl;
}
};
// Derived Class: Customer
class Customer : public Person {
private:
string address;
public:
// Constructor without using initializer list
Customer(string n, int i, string a) : Person("", 0) {
name = n;
id = i;
address = a;
}
void placeOrder() {
cout << name << " placed an order from " << address << endl;
}
// Friend function
friend void showCustomerAddress(Customer c);
};
// Friend function definition
void showCustomerAddress(Customer c) {
cout << " Customer Address is " << c.address << endl;
}
// Derived Class: DeliveryRider
class DeliveryRider : public Person {
private:
string vehicleType;
public:
DeliveryRider(string n, int i, string v) : Person("", 0) {
name = n;
id = i;
vehicleType = v;
}
void deliverOrder() {
cout << name << " is delivering the order using a " << vehicleType << endl;
}
// Friend class
friend class OrderSystem;
};
// Friend Class: OrderSystem
class OrderSystem {
public:
void trackRider(DeliveryRider r) {
cout << "[Tracking] Rider: " << r.name << ", Vehicle: " << r.vehicleType << endl;
}
};
// Main function
int main() {
// Creating objects
Customer c1("Saad", 101, "Lahore");
DeliveryRider r1("Ali", 202, "Bike");
// Using class methods
c1.showBasicInfo();
c1.placeOrder();
// Using friend function
showCustomerAddress(c1);
cout << endl;
r1.showBasicInfo();
r1.deliverOrder();
// Using friend class
OrderSystem system;
system.trackRider(r1);
return 0; }
ScreenShot oF outPut
