Project_01.cpp

#include <iostream>
#include <vector>
#include <string>
using namespace std;

class Product {
protected:
    int productId;
    string productName;
    double price;
    int quantity;

public:
    // Constructor
    Product(int id, string name, double p, int q) {
        productId = id;
        productName = name;
        price = p;
        quantity = q;
    }

    // Pure virtual function (Abstraction)
    virtual double calculateBill() = 0;

    // Virtual destructor
    virtual ~Product() {}

    // Encapsulation (Getters)
    string getName() {
        return productName;
    }

    int getQuantity() {
        return quantity;
    }

    void displayBasicInfo() {
        cout << "ID: " << productId
             << " | Name: " << productName
             << " | Price: " << price
             << " | Qty: " << quantity << endl;
    }
};
class FoodProduct : public Product {
private:
    double gst; // Encapsulation

public:
    FoodProduct(int id, string name, double p, int q)
        : Product(id, name, p, q) {
        gst = 0.05; // 5% GST
    }

    // POLYMORPHISM (Method Overriding)
    double calculateBill() override {
        double total = price * quantity;
        return total + (total * gst);
    }
};

class ElectronicProduct : public Product {
private:
    double gst;

public:
    ElectronicProduct(int id, string name, double p, int q)
        : Product(id, name, p, q) {
        gst = 0.18; // 18% GST
    }

    // POLYMORPHISM
    double calculateBill() override {
        double total = price * quantity;
        return total + (total * gst);
    }
};
class DailySell {
private:
    vector<Product*> products;

public:
    void addProduct(Product* p) {
        products.push_back(p);
    }

    void showAllProducts() {
        cout << "\n----- Product List -----\n";
        for (auto p : products) {
            p->displayBasicInfo();
        }
    }

    void generateBill() {
        double grandTotal = 0;

        cout << "\n----- BILL DETAILS -----\n";
        for (auto p : products) {
            double bill = p->calculateBill(); // Polymorphism
            cout << p->getName() << " Bill: ₹" << bill << endl;
            grandTotal += bill;
        }

        cout << "-------------------------\n";
        cout << "Grand Total: ₹" << grandTotal << endl;
    }

    ~DailySell() {
        for (auto p : products) {
            delete p;
        }
    }
};
int main() {
    DailySell shop;
    int choice;

    do {
        cout << "\n===== DAILY SELL SYSTEM =====\n";
        cout << "1. Add Food Product\n";
        cout << "2. Add Electronic Product\n";
        cout << "3. Show Products\n";
        cout << "4. Generate Bill\n";
        cout << "0. Exit\n";
        cout << "Enter choice: ";
        cin >> choice;

        if (choice == 1) {
            int id, qty;
            string name;
            double price;

            cout << "Enter Food ID: ";
            cin >> id;
            cout << "Enter Food Name: ";
            cin >> name;
            cout << "Enter Price: ";
            cin >> price;
            cout << "Enter Quantity: ";
            cin >> qty;

            shop.addProduct(new FoodProduct(id, name, price, qty));
        }
        else if (choice == 2) {
            int id, qty;
            string name;
            double price;

            cout << "Enter Electronic ID: ";
            cin >> id;
            cout << "Enter Product Name: ";
            cin >> name;
            cout << "Enter Price: ";
            cin >> price;
            cout << "Enter Quantity: ";
            cin >> qty;

            shop.addProduct(new ElectronicProduct(id, name, price, qty));
        }
        else if (choice == 3) {
            shop.showAllProducts();
        }
        else if (choice == 4) {
            shop.generateBill();
        }
        

    } while (choice != 0);

    cout << "Thank you! Visit again.\n";
    return 0;
}