namespace Lesson6.Classes; using Lesson6.Interfaces; public class Operation : IOperation { public double Add(double firstSummand, double secondSummand) => firstSummand + secondSummand; public double Subtract(double minuend, double subtrahend) => minuend - subtrahend; public double Multiply(double firstFactor, double secondFactor) => firstFactor * secondFactor; public double Divide(double dividend, double divisor) => dividend / divisor; public delegate double Do(double firstNumber, double secondNumber); }