C# adding unknown number of values into an array

Question

I want to add multiple values into an array, but I want to stop when I feel like it.

Here is the condition I added

while (numbers[i] != 10)
{
    i++;
    numbers[i] = int.Parse(Console.ReadLine());
    Console.WriteLine(numbers[i]);
}

It will stop when the value entered is 10. But I want it to stop when I just press ENTER.

How do I do this?

The answer is to use a collection as turbanoff said. Take a look at a topic that is the same as yours [link](http://stackoverflow.com/questions/594853/dynamic-array-in-c-sharp) — George Karanikas, Aug 01 '12 at 10:46

score 4 · Accepted Answer · answered Aug 01 '12 at 10:46

4

If you are asking about how to detect the "just press ENTER" condition:

var input = Console.ReadLine();
if (input == "") {
    break;
}

numbers[i] = int.Parse(input);
// etc

answered Aug 01 '12 at 10:46

Jon

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@robertpas then you should [accept it as the answer](http://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work) – dtsg Aug 01 '12 at 11:03
Sry, had to wait 5 mins until i could accept it and had to leave. – robertpas Aug 01 '12 at 11:26

score 3 · Answer 2 · answered Aug 01 '12 at 10:46

3

var numbers = new List<int>();
string s;
while(!string.IsNullOrEmpty(s = Console.ReadLine())) {
    numbers.Add(int.Parse(s));
}

answered Aug 01 '12 at 10:46

Marc Gravell

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Depending on what error behavior is desired, it might also be a good idea to replace `int.Parse` with `int.TryParse`. – CodesInChaos Aug 01 '12 at 10:50
1

you can convert it to an array if thats what you really need: ` int[] array = numbers.ToArray();` – Obaid Aug 01 '12 at 10:50

score 0 · Answer 3 · answered Aug 01 '12 at 10:46

0

I guess you are looking for some way to re-size the array, you can use Array.Resize

answered Aug 01 '12 at 10:46

Vamsi

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1

This doesn't actually resize the array. It creates a new array with the desired size, and copies over the existing elements. – CodesInChaos Aug 01 '12 at 10:51

Mike Perrenoud · Answer 4 · 2012-08-01T10:57:41.347

0

Declare numbers like this.

List<int> numbers = new List<int>();

Then modify the loop as such.

while (numbers[i] != 10)
{
    i++;

    string input = Console.ReadLine();
    if (string.IsNullOrEmpty(input)) { break; }

    numbers.Add(int.Parse(input));
    Console.WriteLine(numbers[i]);  
}

edited Aug 01 '12 at 10:57

answered Aug 01 '12 at 10:46

Mike Perrenoud

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You only answered half the question. You totally missed the stop when the input is empty part. – CodesInChaos Aug 01 '12 at 10:54
@CodesInChaos Thanks! Added that. – Mike Perrenoud Aug 01 '12 at 10:57

C# adding unknown number of values into an array

4 Answers4