using System;

public class Prog

{

    public static void Main()

    {

        compute a = new compute(operation.plus);

        compute a1 = new compute(operation.minus);

        compute a2 = new compute(operation.times);

        compute a3 = new compute(operation.divide);

        compute a4 = new compute(operation.modulo);

        compute a5 = new compute(operation.integral);

        Console.Write("Enter first number: ");

        string s = Console.ReadLine();

        double first = Double.Parse(s);

        Console.Write("Enter second number: ");

        s = Console.ReadLine();

        double second = Double.Parse(s);

        Console.WriteLine("Sum: " + a(first,second));

        Console.WriteLine("Difference: " + a1(first,second));

        Console.WriteLine("Product: " + a2(first,second));

        Console.WriteLine("Normal Qoutient: " + a3(first,second));

        if (first%1==0 && second%1==0)

        {

            Console.WriteLine("Modulo: " + a4(first,second));

        }

        else

        {

            Console.WriteLine("Modulo doesn't work with decimal numbers");

        }

        Console.WriteLine("Integral Qoutient: " + a5(first,second));

    }

}

public delegate double compute(double y, double z);

public class operation

{

    public static double plus(double y, double z)

    {

        double answer = y+z;

        return answer;

    }

    public static double minus(double y, double z)

    {

        double answer = y-z;

        return answer;

    }

    public static double times(double y, double z)

    {

        double answer = y*z;

        return answer;

    }

    public static double divide(double y, double z)

    {

        double answer = y/z;

        return answer;

    }

    public static double modulo(double y, double z)

    {

        double answer = y%z;

        return answer;

    }

    public static double integral(double y, double z)

    {

        double answer = y/z;

        answer = Math.Round(answer);

        return answer;

    }

}