Multiplication using recursion

It's because amount is now of type int rather rather than float or double.

Consequently, when you divide it by 100, integer rather than floating point arithmetic will be used and you'll lose some accuracy in the final result.

I'd therefore change amount to double even if you only intend to input integers.

i tried to convert the code from console to windows forms. except i didn't use the float,
its just double and int.



  public Form1()
  {
  InitializeComponent();
  }

  int m_amount, m_rate, m_years;
  double m_total = 0;

  private void btnCALCULATE_Click(object sender, EventArgs e)
  {
  m_amount = int.Parse(tbAMOUNT.Text);
  m_rate = int.Parse(tbRATE.Text);
  m_years = (int)numYEARS.Value;
  m_total = Recursion(m_amount, m_rate, m_years);
 
  tbFUTUREVALUE.Text = m_total.ToString("C2");
  }

  static double Recursion(int amount, int years, int rate)
  {
  if (years < 1) return amount;
  amount += amount / 100 * rate;
  return Recursion(amount, years - 1, rate);
  }
  }

it works but wrong calculation:
i put the same value: 10000 amount, 10 interest rate, 10 in investment period. the difference is the future value.
the future value : $25, 910.00 instead of $25, 937.42

But the result is one and only the same right?

Let me know the status whether it's working or not after you check that out.

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this is whole code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace interest_calculation
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                float principal_amount = 0;
                int no_of_yrs = 0;
                int interest_rate = 0;
                float final_amount = 0;
                Console.Write("Please Enter the principal amount : ");
                principal_amount = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine();
                Console.Write("Please Enter the years you want to deposit for : ");
                no_of_yrs = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine();
                Console.Write("Please Enter the interest rate : ");
                interest_rate = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine();

                for (int i = 0; i < no_of_yrs; i++)
                {
                    final_amount = principal_amount + ((principal_amount / 100) * interest_rate);
                    principal_amount = final_amount;
                }
                Console.WriteLine("Your final returns are : " + Convert.ToString(final_amount));
                Console.ReadLine();
            }
        }
    }
}

ignore the int amount in the code...

I'm will trying to display the final answer using recursion code...

Any number in principal amount and interest rate.
The range will be 1 to 100, representing the years of investment.
The calculated interest will be added to the principal value once every period (year).

example:
Lets put 10000 in principal amount and 10% in interest rate and
And 10 in years of investment.

The calculation would be this:

10000 * 1.1 = 11000 or ((10000 * 0.1)  + 10000)
11000 * 1.1 = 12100 or ((11000 * 0.1)  + 11000)
12100 * 1.1 = . . . .
. . . .  * 1.1 = 25, 937.42

finally would be $25, 937.42

Can you please explain in detail what you are trying to do? Are you trying to get number of years from console window and trying to display the calculated interest along with the principle amount back in console window or what? If so can the years be more or less than 10 or else is the years fixed to 10? Explain your requirements in detail so that anyone can come up with an exact solution.