Example: C++ Bill Statement Generator in C++

// C++ Bill Statement Generator
#include <iostream>  // For input/output operations
#include <vector>    // To store multiple item details
#include <string>    // For item names
#include <iomanip>   // For output formatting (e.g., std::setprecision)

// Structure to hold item details
struct Item {
    std::string name;
    int quantity;
    double unitPrice;
    double total;
};

int main() {
    std::cout << "-------------------------------------------\n";
    std::cout << "        Simple Bill Statement Generator    \n";
    std::cout << "-------------------------------------------\n";

    std::vector<Item> items; // A list to store all items
    char addMore = 'y';
    double grandSubtotal = 0.0;
    const double TAX_RATE = 0.05; // 5% tax rate

    // Step 1: Input item details from the user
    while (addMore == 'y' || addMore == 'Y') {
        Item newItem;
        std::cout << "\nEnter Item Name: ";
        std::cin.ignore(); // Clear the buffer before reading string
        std::getline(std::cin, newItem.name);

        std::cout << "Enter Quantity: ";
        std::cin >> newItem.quantity;

        std::cout << "Enter Unit Price: $";
        std::cin >> newItem.unitPrice;

        newItem.total = newItem.quantity * newItem.unitPrice;
        grandSubtotal += newItem.total;
        items.push_back(newItem);

        std::cout << "Add another item? (y/n): ";
        std::cin >> addMore;
    }

    // Step 2: Display the formatted bill statement
    std::cout << "\n\n--------------------------------------------------\n";
    std::cout << "                ABC Store - Bill                \n";
    std::cout << "--------------------------------------------------\n";
    std::cout << std::left << std::setw(20) << "Item"
              << std::right << std::setw(8) << "Qty"
              << std::right << std::setw(12) << "Price"
              << std::right << std::setw(12) << "Total\n";
    std::cout << "--------------------------------------------------\n";

    // Use fixed and setprecision for currency formatting
    std::cout << std::fixed << std::setprecision(2);

    for (const auto& item : items) {
        std::cout << std::left << std::setw(20) << item.name
                  << std::right << std::setw(8) << item.quantity
                  << std::right << std::setw(12) << item.unitPrice
                  << std::right << std::setw(12) << item.total << "\n";
    }

    std::cout << "--------------------------------------------------\n";
    double taxAmount = grandSubtotal * TAX_RATE;
    double finalTotal = grandSubtotal + taxAmount;

    std::cout << std::left << std::setw(40) << "Subtotal:"
              << std::right << "$" << std::setw(10) << grandSubtotal << "\n";
    std::cout << std::left << std::setw(40) << "Tax (" + std::to_string(static_cast<int>(TAX_RATE * 100)) + "%):"
              << std::right << "$" << std::setw(10) << taxAmount << "\n";
    std::cout << "--------------------------------------------------\n";
    std::cout << std::left << std::setw(40) << "Total Amount Due:"
              << std::right << "$" << std::setw(10) << finalTotal << "\n";
    std::cout << "--------------------------------------------------\n";
    std::cout << "Thank you for your purchase!\n";

    return 0;
}