Question: My goal is, at every new input to the question which i marked, the array gets a new input.
For example:

```
double[] Test = new double[10];
"give input" | 
int input = int.Parse(Console.ReadLine()) |
Test[0] = input |

```

> 
> Again to "give input". just that circle and with every input the "Test [HERE]" gets there a new input. (Like if u would do that manually)
> 
> 
> 

sry for my bad english. english insn't my native language.

```
static void Main(string[] args)
        {
            Mittelwert();
        }
        public static void Mittelwert()
        {
            double[] Test = new double[10];
            for (int i = 1; i < 11; i++)
            {
                Console.WriteLine("Geben Sie ihren " + i + " Wert ein");
                int input = int.Parse(Console.ReadLine());

                Test[+1] = input;

            }
            var Average = Enumerable.Average(Test);
            Console.WriteLine("Der Durchschnitt ist " + Average);

        }
    ```

```

Answer: 
You can use `i` as the index of the array, but note that C# arrays are zero-based (i.e., the first index is `0`, the second is `1`, etc):

```cs
for (int i = 0; i < 10; i++)
{
    Console.WriteLine("Geben Sie ihren " + (i +1) + " Wert ein");
    int input = int.Parse(Console.ReadLine());

    Test[i] = input;
}

```
If I understand what you are trying to do, you want to iterate a number of times over a *collection* and once the iterator passes the length of the *collection*, you want to essentially append new items to the end.

For this `Array`s are not the best option, you want to instead use `List<T>` which scales up as you add new items.

```
    static void Main(string[] args)
    {
        Mittelwert();
    }
    public static void Mittelwert()
    {
        List<double> Test = new List<double> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        for (int i = 1; i < 11; i++)
        {
            Console.WriteLine("Geben Sie ihren " + i + " Wert ein");
            int input = int.Parse(Console.ReadLine());

            if (Test.Count < i)
                Test[i] = input;
            else Test.Add(input);

        }
        var Average = Enumerable.Average(Test);
        Console.WriteLine("Der Durchschnitt ist " + Average);

    }

```