using System;

​

/*

Task:

Implement an AdvancedCalculator class with the following methods:

​

        1. Add(int a, int b): int - This method should return the sum of 

        two integers.

​

        2. Subtract(int a, int b): int - This method should return the 

        result of subtracting the second integer from the first.

​

        3. Multiply(int a, int b): int - This method should return the 

        product of two integers.

​

        4. Divide(int a, int b): double - This method should return the

        result of dividing the first integer by the second as a double.

​

        5. Power(int base, int exponent): double - This static method 

        should return the result of raising the base to the power of 

        the exponent.

​

        6. ApplyOperation(int a, int b, IOperation operation): double - This 

        method should take two integers and an object that implements the 

        IOperation interface. It should apply the operation defined by the 

        IOperation object to the two integers.

    Implement the IOperation interface with a method:

    public interface IOperation

    {

        int Operate(int a, int b);

    }

    Create a class CustomOperation that implements the IOperation interface. 

    This class should perform a custom operation on the two integers 

    (for example, concatenating them as strings and converting back to an integer).

*/

​

/////////////////////////////////////////////////////////////////////////

// Your task is to create the AdvancedCalculator, IOperation interface, 

// and CustomOperation class, and implement the above methods to achieve 

// the expected results.

​

// ***** write class/interface here *******

public interface IOperation

    {

        int Operate(int a, int b);

    }

​

public class CustomOperation : IOperation

{

//concatenating them as strings and converting back to an integer

    public int Operate(int a, int b)

    {

        string result = a.ToString() + b.ToString();

        return int.Parse(result);

    }

}

public class AdvancedCalculator{

    public int Add(int a, int b) 

        {

        return a + b;

        }

    public int Substract (int a, int b)

    {

        return a - b;

    }

    public int Multiply(int a, int b)

    {

        return a * b;

    }

    public double Divide(int a, int b)

    {

        return (double) a / b;

    }

    public static double Power_v1 (int b, int expose)

    {

        return Math.Pow(b, expose);

    }

    public static double Power_v2 (int b, int expose)

    {

        int result = 1;

        for(int i = 1; i<= expose; i++)

        {

            result *= b;

        }

        return result;

    }

    public double ApplyOperation(int a, int b, IOperation operation)

    {

        return operation.Operate(a,b);

    }

}

// ****************************************

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}