Simple C# output

Question

So I have been playing around with C# lately and I don't understand output formatting. ``` using System; namespace Arrays { class Program { static void Main() { Random r = new Random(); int[] Numbers = new int[10]; for (int i = 0; i < Numbers.Length; i++) { Numbers[i] = r.Next(101); } for (int i = 0; i < Numbers.Length; i++) { Console.WriteLine("index {0} holds number {0}", i,Numbers[i]); } } } } ``` Output My expected output was `index i holds number Number[i]`. So can anyone explain what to change, or link me with a good C# page on output formatting topic. I know there is a way to do it in 2 lines.

Accepted Answer

Change

```
Console.WriteLine("index {0} holds number {0}", i, Numbers[i]);
```

to

```
Console.WriteLine("index {0} holds number {1}", i, Numbers[i]);
```

Reason: Your indices (in the format string) reference the parameters after the string in zero-based index order. So {0} for the first parameter after the string, {1} for the second, {2} if you have a third etc.

See this page for more info.

edit: You can reference the parameters multiple times in your format String, too. E.g.:

```
Console.WriteLine(
    "index {0} holds number {1} (Numbers[{0}] == {1})", i, Numbers[i]);
```

This also is equivalent to

```
Console.WriteLine(String.Format(
    "index {0} holds number {1} (Numbers[{0}] == {1})", i, Numbers[i]));
```

Simple C# output

Solution

Problem