using System;
using System.Collections.Generic;

namespace DelegateCalc
{
    internal class Program
    {
        private delegate double operation(string A, string B);

        private static Dictionary<char, operation> Operations = new Dictionary<char, operation>()
        {
            ['+'] = Plus,
            ['-'] = Minus,
        };

        private static double Plus(string A, string B)
        {
            try
            {
                double.TryParse(A, out double num1);
                double.TryParse(B, out double num2);
                return num1 + num2;
            }
            catch (Exception)
            {
                throw new ArithmeticException();
            }
        }

        private static double Minus(string A, string B)
        {
            try
            {
                double.TryParse(A, out double num1);
                double.TryParse(B, out double num2);
                return num1 - num2;
            }
            catch (Exception)
            {
                throw new ArithmeticException();
            }
        }

        private static void Main(string[] args)
        {
            Console.WriteLine("Введите выражение");
            var separators = new List<char>();

            foreach (var item in Operations.Keys)
            {
                separators.Add(item);
            }

            var exp = Console.ReadLine().Split(separators.ToArray());
        }

        private static double Resolve(string[] exp)
        {
            return Operations[exp[1].ToCharArray()[0]](exp[0], exp[2]);
        }

    }
}