static void Main(string[] args)
{
var calc = new RPN_Calc();
try
{
if (args.Length == 1)
{
Console.WriteLine(calc.Calculate(args[0]));
}
else
{
Console.WriteLine("Enter expression");
Console.WriteLine(calc.Calculate(Console.ReadLine()));
}
}
catch (Exception e) when(
e is RPNCalculatorException ||
e is ArgumentException
)
{
Console.WriteLine(e.Message);
}
}