C# Program to Check Whether the Given Number is a Amicable Number or Not

using System;

class Program
{
    static void Main()
    {
        Console.Write("Enter the first number: ");
        int num1 = Convert.ToInt32(Console.ReadLine());

        Console.Write("Enter the second number: ");
        int num2 = Convert.ToInt32(Console.ReadLine());

        if (AreAmicableNumbers(num1, num2))
        {
            Console.WriteLine($"({num1}, {num2}) is an amicable pair.");
        }
        else
        {
            Console.WriteLine($"({num1}, {num2}) is not an amicable pair.");
        }
    }

    static bool AreAmicableNumbers(int num1, int num2)
    {
        if (num1 <= 0 || num2 <= 0)
        {
            return false;
        }

        int sumDivisors1 = CalculateSumOfDivisors(num1);
        int sumDivisors2 = CalculateSumOfDivisors(num2);

        return sumDivisors1 == num2 && sumDivisors2 == num1;
    }

    static int CalculateSumOfDivisors(int num)
    {
        int sum = 0;
        for (int divisor = 1; divisor < num; divisor++)
        {
            if (num % divisor == 0)
            {
                sum += divisor;
            }
        }
        return sum;
    }
}