Homework ClassesAndObjects - Task 06

using System;
using System.Text;

    class CalculateSum
    {
        static void Main()
        {
            string input = "25 28 1 8 15 11";
            input = input.Trim();

            Console.WriteLine("\n{0} -> Sum = {1}", input, GetSum(input));
        }

        static int GetSum(string input)
        {
            int sum = 0;
            StringBuilder expression = new StringBuilder(input + ' ');

            while (expression[0] !=  ' ')
            {
                string num = expression.ToString().Substring(0, expression.ToString().IndexOf(' '));
                sum += int.Parse(num);
                expression = expression.Remove(0, expression.ToString().IndexOf(' ') + 1);
                expression = new StringBuilder(expression.ToString().Trim() + ' ');
            }

            return sum;
        }
    }