CODEWITHSUNDEEP
c#
Huahua
Huahua

Reputation: 47

How to get the length of an array with out empty value?

I'm now doing a project about solving a Magic cube problem. I want to create an array to remember the steps like this:

char[] Steps = new char[200];

Each time I do the 'F','B','R','L','U','D' turn method, it will add a 'F','B','R','L','U','D' character in the array. But when I want to get the length of the steps, it always shows 200.

for example:

char[] steps = new char[5];

and now I've already added 3 steps:

steps[] = {'f','b','f','',''};

How can I get the length '3'?

Or is there any alternative method I can use that I don't need to set the length at the beginning?

Upvotes: 0

Views: 1927

Answers (4)

BRAHIM Kamel
BRAHIM Kamel

Reputation: 13794

you can just use List<char> but if performance is really critical in your sceanario you can just initialize the initial capacity

something like the following 

List<char> list  = new List<char>(200);
list.Add('c');
list.Add('b');

here count will return just what you have really added 

var c = list.Count;

note in list you can apply Linq Count() or just use the Count property which does not need to compute like Linq and return the result immediately

Upvotes: 3

Louis-Roch Tessier
Louis-Roch Tessier

Reputation: 823

you could use a list of character that would make things a lot simpler like this :

List<char> steps = new List<char>();

and just add a line to the list for each steps :

char move = 'F';
steps.add(move);

finally then you can count the number of move in the list easily

int numberofmove = steps.count();

Upvotes: 0

degant
degant

Reputation: 4981

To count non-empty items using System.Linq:

steps.Count(x => x != '\0');

Your code doesn't compile since '' isn't allowed as a char, but I'm assuming that you mean empty elements in a char array which are actually represented by '\0' or the Unicode Null. So the above condition simply counts the non null items in your array.

Upvotes: 0

Samvel Petrosov
Samvel Petrosov

Reputation: 7706

You will get compilation error on this line

steps[] = {'f','b','f','',''};

As you cannot use empty char and you need to write steps instead of steps[]. I will suggest you to use string array instead and using LINQ get count of not empty elements in this way:

string [] steps = {"f","b","f","",""};
Console.WriteLine(steps.Where(x=>!string.IsNullOrEmpty(x)).Count());

Upvotes: 2

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