Tax Calculator in C# - How to Display debt over time

Question

So id like to create a tax calculator in c# that does the following:

Example 1:

Input:

1200.0 - amount loaned

10 - tax in percentage

3 - number of years in debt 

Output:

    Growth of debt throughout 3 years:

    1200.0

    1320.0

    1452.0

    1597.2

So far i have this:

static int Mostra(int n, int p, int q)
    {
        int res = n + ((n * (p / 100)) * q);

        Console.WriteLine("Crescimento da dívida ao longo de " + q.ToString() + " anos:");

    }


    static bool Validar(string s, out int i)
    {
        bool res = int.TryParse(s, out i);
        if (!res)
            i = 0;
        return res;

    }


    static void Main(string[] args)
    {
        Console.WriteLine("Insira o valor do seu empréstimo em euros:");
        string s1 = Console.ReadLine();
        Console.WriteLine("Insira o valor correspondente à taxa de juro acordada:");
        string s2 = Console.ReadLine();
        Console.WriteLine("Insira o número de anos em que a dívida não foi paga:");
        string s3 = Console.ReadLine();

        string[] valores = new string[p];


        int n;
        int p;
        int q;


        if (Validar(s1, out n) && Validar(s2, out p) && Validar(s3, out q))
        {
            if (n >= 0 && p >= 0 && q >= 0 && p <= 100)
            {
                //Mostra(n, p, q);
            }
            else
                Console.WriteLine("O valor introduzido é inválido.");

        }

        Console.ReadKey();
    }

Keep in mind that this is a Console Application. My issue here is how to display the debt over the years instead of the final result. And also how to display it in decimals as shown in the example. ifyou could help me id be very happy :D

Answer 1

If you want to display the result as a decimal, you should use the decimal data type not the int data type.

in your initial example though you also are adding interest per year, though your calculation is flat interest over the entire time period, the function should look more like

static int Mostra(decimal n, decimal p, int q)
{
    Console.WriteLine("Crescimento da dívida ao longo de " + q.ToString() + " anos:");
    decimal res = n;
    for (int i = 1; i <= q; i++)
    {
        res+= res * (p / 100);
        Console.WriteLine(res);
    }

}

you would also need to edit the Validar method to handle converting decimals using decimal.TryParse as the interest rate and amount should be decimals to handle decimal based calculations - the Year can still be an integer though

Answer 2

Here ya go, there were a couple things I noticed that were a little wonky. You'll want to change some of the variables in Validar from ints to doubles... otherwise if you want your input to be x.0, your code won't handle the .0 since you're looking for an int in your Validar method. I've fixed some of the code so that any ints you put in will work and you'll get the output in the format that you're looking for.

using System;

    public class Program
    {
     static void Mostra(double n, double p, double q)
     {
    //double res = n + ((n * (p / 100)) * q);

    Console.WriteLine("Crescimento da dívida ao longo de " + q.ToString() + " anos: \n");

    //Loop that increments each year for q number of years
    for (int x = 0; x < q + 1; x++)
    {
        double res = 0;
        res = n + ((n * (p / 100)) * x);
        Console.WriteLine(res);
    }

}


static double Validar(string s)
{
    int x = int.Parse(s);
    double res = (double)(x);

    return res;

}


public static void Main(string[] args)
{
    Console.WriteLine("Insira o valor do seu empréstimo em euros:");
    string s1 = Console.ReadLine();
    Console.WriteLine("Insira o valor correspondente à taxa de juro acordada:");
    string s2 = Console.ReadLine();
    Console.WriteLine("Insira o número de anos em que a dívida não foi paga:");
    string s3 = Console.ReadLine();

    double n = Validar(s1);
    double p = Validar(s2);
    double q = Validar(s3);



    if (n >= 0 && p >= 0 && q >= 0 && p <= 100)
    {
        Mostra(n, p, q);
    }
    else
        Console.WriteLine("O valor introduzido é inválido.");

}
}