using System;

namespace ConsoleApp1
{
    public class Calculator
    {
        public string Calculate()
        {
            return "This is an example of overloading.";
        }

        /// <summary>
        ///      A simple calculation unit.
        /// </summary>
        /// <param name="number1">Numeric value one to do the evaluation by.</param>
        /// <param name="number2">Numeric value two to do the evaluation by.</param>
        /// <param name="expression">The expression to do on the two numeric values.</param>
        /// <returns>The result of the calculation.</returns>
        public string Calculate(int number1, int number2, string expression)
        {
            string ReturnValue;

            switch (expression)
            {
                case "*":
                    ReturnValue = (number1 * number2).ToString();
                    break;

                case "+":
                    ReturnValue = (number1 + number2).ToString();
                    break;

                case "-":
                    ReturnValue = (number1 - number2).ToString();
                    break;

                default:
                    ReturnValue = "This is a unsupported action.";
                    break;
            }

            return $"The result of {number1} {expression} {number2} = {ReturnValue}";
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Calculator Calculation = new Calculator();

            Console.WriteLine(Calculation.Calculate());
            Console.WriteLine(Calculation.Calculate(25, 25, "*"));
            Console.ReadLine();
        }
    }
}