import 'dart:io';

void main() {
  print("Welcome to the Lemonade Sale!");

  double pricePerGlass = 2.0;
  int glassesSold = 0;
  double totalRevenue = 0;

  // simulate lemonade sales
  while (glassesSold < 100) {
    glassesSold += 10; // sells 10 glasses every hour
    totalRevenue = pricePerGlass * glassesSold;

    // apply 10% discount if more than 50 glasses sold
    if (glassesSold > 50) {
      totalRevenue *= 0.9;
    }

    // every 5th customer gets a free glass
    if (glassesSold % 5 == 0) {
      print("Customer number $glassesSold gets a free glass!");
    }

    print("Glasses sold: $glassesSold | Total revenue: \$${totalRevenue.toStringAsFixed(2)}");
  }

  // temperature conversion (Celsius to Fahrenheit)
  double celsius = 25;
  double fahrenheit = (celsius * 9 / 5) + 32;
  print("Today's temperature is $fahrenheit °F - perfect weather for lemonade!");
}