static void Main(string[] args)
{
StringCalculator FirstCalc = new StringCalculator();
do
{
FirstCalc.Greeting();
Console.WriteLine($"Answer is: {FirstCalc.CalculateEquation(Console.ReadLine())}");
Console.WriteLine("Press \"Escape\" to exit, any key to continue.");
}while (Console.ReadKey().Key != ConsoleKey.Escape);
Console.ReadKey();
}
