The Muggy Weather Robotics Duo

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Image
 The Muggy Weather Robotics Duo A C++ System That Thinks, Feels (Sensors!), and Acts Humidity is like the quiet character in the weather story that actually runs the show. On muggy days, everything feels heavier—breathing, drying laundry, running machines, even keeping a data center cool. For people, it’s about comfort and health; for machines, it’s about performance and reliability; for plants and buildings, it’s about moisture balance and mold risk. In robotics and automation, muggy weather isn’t just a nuisance—it’s a signal . It tells your systems when to ventilate, when to dehumidify, when to throttle physically demanding tasks, and when to take preventative maintenance actions. Today, we’ll build a two-program C++ system that “understands” muggy weather: Program A — sensor_hub.cpp A sensor-side program that generates (or ingests) a live stream of environmental data (temperature, relative humidity, pressure, CO₂, VOCs). Think of it as your robotic nose and skin , con...
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McDonald's Style Website Template Using C++ Crow

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McDonald's Style Website Template Using C++ Crow

Overview

This tutorial will guide you through creating a McDonald's-style website template using C++ Crow. The template includes:

  • Two beef burgers: Big Mac and Quarter Pounder
  • A discount system (e.g., "20% OFF on Big Mac!")
  • Styling similar to McDonald's branding

Installing Dependencies

Linux (Ubuntu)

First, install Crow and Boost:

sudo apt update  
sudo apt install libboost-all-dev

Windows

Use vcpkg to install Boost:

vcpkg install boost

Creating a C++ Web Server with Discounts

Create a file named server.cpp and paste the following code:

#include "crow_all.h"
#include <unordered_map>

struct Burger {
    std::string name;
    double price;
    double discount; // Discount percentage (e.g., 20% -> 0.2)
};

// Create a menu with two beef burgers and their discounts
std::unordered_map<std::string, Burger> menu = {
    {"bigmac", {"Big Mac", 5.99, 0.2}},  // 20% OFF
    {"quarterpounder", {"Quarter Pounder", 6.49, 0.0}}  // No discount
};

// Function to generate the HTML for the menu
std::string generateMenuHtml() {
    std::string html = "<!DOCTYPE html><html lang='en'><head>"
                       "<title>McDonald's Menu</title>"
                       "<style>"
                       "body { font-family: Arial, sans-serif; background-color: #ffcc00; text-align: center; }"
                       "h1 { color: #d91a1a; }"
                       "nav { background: #d91a1a; padding: 10px; }"
                       "nav a { color: white; margin: 10px; text-decoration: none; }"
                       ".menu { margin-top: 20px; }"
                       ".menu-item { display: inline-block; padding: 20px; background: white; margin: 10px; border-radius: 10px; }"
                       ".discount { color: green; font-weight: bold; }"
                       "</style></head><body>"
                       "<nav><a href='/'>Home</a> | <a href='/menu'>Menu</a> | <a href='/contact'>Contact</a></nav>"
                       "<h1>McDonald's Menu</h1><div class='menu'>";

    for (const auto& item : menu) {
        const Burger& burger = item.second;
        double discountedPrice = burger.price * (1 - burger.discount);

        html += "<div class='menu-item'><h3>" + burger.name + "</h3><p>Price: $" +
                std::to_string(burger.price) + "</p>";

        if (burger.discount > 0) {
            html += "<p class='discount'>Promo: " + std::to_string(static_cast<int>(burger.discount * 100)) +
                    "% OFF!</p>";
            html += "<p><b>Now: $" + std::to_string(discountedPrice) + "</b></p>";
        }

        html += "</div>";
    }

    html += "</div></body></html>";
    return html;
}

int main() {
    crow::SimpleApp app;

    // Homepage route
    CROW_ROUTE(app, "/")([]() {
        return "<!DOCTYPE html><html lang='en'>"
               "<head><title>McDonald's</title>"
               "<style>"
               "body { font-family: Arial, sans-serif; background-color: #ffcc00; text-align: center; }"
               "h1 { color: #d91a1a; }"
               "nav { background: #d91a1a; padding: 10px; }"
               "nav a { color: white; margin: 10px; text-decoration: none; }"
               "</style></head><body>"
               "<nav><a href='/'>Home</a> | <a href='/menu'>Menu</a></nav>"
               "<h1>Welcome to McDonald's</h1>"
               "<p>Delicious beef burgers with amazing deals!</p>"
               "</body></html>";
    });

    // Menu route
    CROW_ROUTE(app, "/menu")([]() {
        return generateMenuHtml();
    });

    // Contact page
    CROW_ROUTE(app, "/contact")([]() {
        return "<!DOCTYPE html><html lang='en'>"
               "<head><title>Contact McDonald's</title></head>"
               "<body><h1>Contact Us</h1>"
               "<p>Email: support@mcdonalds.com</p>"
               "<p>Phone: +1 800-555-1234</p>"
               "</body></html>";
    });

    app.port(8080).multithreaded().run();
}

Explanation

Menu System

  • unordered_map stores the Big Mac and Quarter Pounder with their prices and discounts.
  • The generateMenuHtml() function dynamically generates the HTML menu.
  • The Big Mac has a 20% discount, while the Quarter Pounder has no discount.

Routing

  • / → Homepage
  • /menu → Displays the menu with discounts
  • /contact → Contact page

Styling

  • McDonald's theme colors: Yellow (#ffcc00) and Red (#d91a1a)
  • Discounted burgers display a green "Promo" label with the reduced price.

Compile and Run

Compilation

g++ server.cpp -o server -lboost_system -lpthread

Running the Server

./server

Open in Browser

Go to:

http://localhost:8080

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