using System;

public class MathOperations

{

    // Basic arithmetic with method overloading

    public static int Add(int a, int b)

    {

        return a + b;

    }

    public static double Add(double a, double b)

    {

        return a + b;

    }

    public static decimal Add(decimal a, decimal b)

    {

        return a + b;

    }

​

    // Using out parameters

    public static void DivideWithRemainder(int dividend, int divisor, out int quotient, out int remainder)

    {

        if (dividend == 0)

        {

            quotient = 0;

            remainder = 0;

        }

        else

        {

            quotient = dividend / divisor;

            remainder = dividend % divisor;

        }

    }

​

    // Using ref parameter

    public static void SwapNumbers(ref int a, ref int b)

    {

        int temp = a;

        a = b;

        b = temp;

    }

​

    // Using params

    public static double CalculateAverage(params double[] numbers)

    {

        if (numbers.Length == 0)

        {

            return 0;

        }

        else 

        {

            double sum = 0;

            foreach(double num in numbers)

            {

                sum += num;

            }

            return (double)sum / numbers.Length;

        }

    }

    // Using optional parameters

    public static double CalculatePower(double baseNumber, int exponent = 2)

    {

        double total = 1;

        while(exponent != 0)

        {

            total = total * baseNumber;

            exponent--;

        }

        return total;

    }

    public static void Main()

    {

        Console.WriteLine("Math Operations Test");

        Console.WriteLine("-------------------");

        int a = 15;

        int b = 25;

        int sum = Add(a, b);

        Console.WriteLine($"Addition: {a} + {b} = {sum}");

        double c = 15.5;

        double d = 25.7;

        Console.WriteLine($"Decimal Addition: {c} + {d} = {Add(c, d)}");

        int e = 17;

        int f = 5;

        int quotient;

        int remainder;

        DivideWithRemainder(e, f, out quotient, out remainder);

        Console.WriteLine($"Division: {e} / {f} = {quotient} remainder {remainder}");

        a = 10;

        b = 20;

        SwapNumbers(ref a, ref b);

        Console.WriteLine($"Swapped Numbers: a = {a}, b = {b}");

        c = 15.5;

        d = 13.5;

        Console.WriteLine($"Average of numbers: {CalculateAverage(c, d)}");

        a = 2;

        b = 3;

        Console.WriteLine($"Power calculation: {a}^{b} = {CalculatePower(a,b)}");

    }

}