Program.cs

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namespace CalculatorApp {
 
internal class Program {
  private static int Main(string[] args) {
    try {
      string output = args.Length == 0 ? CalculatorLibrary.CalculatorCli.RunDemo() : CalculatorLibrary.CalculatorCli.Run(args);
      Console.WriteLine(output);
      return 0;
    } catch (Exception ex) when (ex is ArgumentException or DivideByZeroException) {
      Console.Error.WriteLine($"Error: {ex.Message}");
      return 1;
    }
  }
}
}