using System;

public class Program

{

    public static void Main()

    {

        double p=0;

        double f =0;

        Console.WriteLine(" the interst rate is :");

        double i = double.Parse(Console.ReadLine());

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

        Console.WriteLine(" the number of years are :");

        double n = double.Parse(Console.ReadLine());

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

        Console.WriteLine(" if you need the future amount press(1), if you need the present amount press(2), if you need the future and present amount press(3)");

         Console.WriteLine(" what do you need");

        int a =int.Parse(Console.ReadLine());

        if( a==1)

        {

        future(i, n , p);

        }

        if( a==2)

        {

       present(i, n , f);

        }

        else if( a==3)

        {

        present(i, n , f);

        future(i, n , p);

        }

         else 

         {

                    Console.WriteLine(" error please try again ");

         }

​

    }

    static double future(double i,double n,double p)

    {

        Console.WriteLine(" the present money :");

         p = double.Parse(Console.ReadLine());

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

        double f = p*(Math.Pow((i+1),n));

        return(f);

    }

    static double present (double i,double n,double f)

    {

        Console.WriteLine(" the future money :");

        f = double.Parse(Console.ReadLine());

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

        double p=f / (Math.Pow((1 + i), n));

        return(p);

    }

    static void output(double p,double f)

    {

        Console.WriteLine(" the future amount of money is "+f);

        Console.WriteLine(" the present amount of money is "+p);

    }

​

}