C# - how can I count the number of elements in an array?

Question

1.00/5 (1 vote)

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for example`
DynamicArray d = new DynamicArray(4, 5, 6, 1, 2);
when i will call GetLength function, it will print 5.
Console.WriteLine(d.GetLength());
It will print "Number of elements are 5"

What I have tried:

I wrote this function`

public int GetLength(params int[] x)
{
// I don't know what write here.
}

Posted 18-Jan-18 5:11am

Suren97

Updated 18-Jan-18 5:18am

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2 solutions

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OriginalGriff · Accepted Answer · 2018-01-18T05:17:00

Solution 1

Try:

C#

public int GetLength(params int[] x)
    {
    return x.Length;
    }

Posted 18-Jan-18 5:17am

OriginalGriff

Comments

Thomas Daniels 18-Jan-18 11:19am

Beat me to it! :laugh: +5

OriginalGriff 18-Jan-18 11:30am

I *knew* that typing course would come in handy! ;)

Suren97 18-Jan-18 11:23am

Thank you very much :)
and please can you say how can i remove random element from that array?

OriginalGriff 18-Jan-18 11:30am

You can't remove elements from a standard array at all - once it's allocated, it can't change size. I've not heard of a class called DynamicArray, but there is the List class which is flexible and will allow you to Insert and Delete elements, as well as access elements via an index just as if it was an array (which it is, internally - it wraps an array).

But...if you are regularly inserting or deleting elements (from a List or anything similar) you might want to read this:
https://www.codeproject.com/Articles/870013/List-T-Is-it-really-as-efficient-as-you-probably-t
There are performance concerns if the element count gets high.

Thomas Daniels · Accepted Answer · 2018-01-18T05:18:00

Solution 2

I don't know what DynamicArray is, but to complete the code snippet you have (getting the length of an integer array), you only have to return x.Length:

C#

public int GetLength(params int[] x)
{
    return x.Length;
}

Posted 18-Jan-18 5:18am

Thomas Daniels

Comments

Suren97 18-Jan-18 11:23am

Thank you very much :)
and please can you say how can i remove random element from that array?

Thomas Daniels 18-Jan-18 11:26am

You can't remove elements from arrays, but you can use a List<int>, then generate a random integer (that's a valid index of the List) and then use the RemoveAt method: see the documentation of List<T> and Random.

Suren97 18-Jan-18 11:28am

for example i want remove number 6, i can't?

Thomas Daniels 18-Jan-18 11:28am

Not with an array; but you can use a List<int> and then you can do .Remove(6) on the list.

Suren97 18-Jan-18 11:30am

if not with an array, for example with what?

Thomas Daniels 18-Jan-18 11:31am

As I said, with a List<int>

Suren97 18-Jan-18 11:31am

i can't create function which will remove any element from this?
DynamicArray d = new DynamicArray(4, 5, 6, 1, 2);

Thomas Daniels 18-Jan-18 11:32am

But what's DynamicArray?

Suren97 18-Jan-18 11:34am

it's class

Thomas Daniels 18-Jan-18 11:37am

Is it your class? Then the interns of that class decide whether you can remove something from it or not.

Dave Kreskowiak 18-Jan-18 11:37am

No sh*t. It's not part of the .NET Framework so it has to be something you wrote. Without seeing that code, it's impossible to tell you how to do this.

Suren97 18-Jan-18 11:37am

i have DynamicArray class which get new DynamicArray(4,5,6,1,2)
need me when i will call d.remove(2) function, it will remove number 6 and will print 4,5,1,2

Dave Kreskowiak 18-Jan-18 11:39am

Well, your DynamicArray class has to be maintaining an array internally. So, in order to remove an element, you have to allocate a new array one element smaller than the original, copy all of the elements except the one you're deleting to the new array and then set your internal array pointer to the new array instance.

Simple.

Suren97 18-Jan-18 11:42am

yes, you are right, please tell me how should i write that code?

Dave Kreskowiak 18-Jan-18 11:53am

I already did.

No, I'm not going to write it for you. I've got about 2,000 lines of my own code I have to write today.

Suren97 18-Jan-18 11:59am

ok :(
Thank you

Suren97 18-Jan-18 13:24pm

Please if you will be free, send me that code.

Dave Kreskowiak 18-Jan-18 15:47pm

That's not going to happen. I'm working 60+ hours a week on my own stuff. There isn't anyone here that's going to do your work for you.

C# - how can I count the number of elements in an array?

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C# - how can I count the number of elements in an array?

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