CODEWITHSUNDEEP
c#
user6268517
user6268517

Reputation:

Add value to integer array in C#

How can I add a single Integer to an Integer Array?

 if (valuesHigherThanAverage.Length == 0) valuesHigherThanAverage[valuesHigherThanAverage.Length] = arrayGetal;
 else valuesHigherThanAverage[valuesHigherThanAverage.Length + 1] = arrayGetal;

I have this code and I have also tried with for or foreach loop but it doesn't worked. And I need to use an INT[] and may not use an List.

Upvotes: 0

Views: 7201

Answers (4)

Olli
Olli

Reputation: 686

You can create a new Array with the length of the old array + 1.

public static int[] AddIntToArray(int[] sourceArray, int addValue)
{
    int[] newArray = new int[sourceArray.Length + 1];
    Array.Copy(sourceArray, newArray, sourceArray.Length);
    newArray[newArray.Length] = addValue;
    return newArray;
}

Upvotes: 0

NoviceProgrammer
NoviceProgrammer

Reputation: 3365

The array is not designed to be extended as new elements are added. You will need to call Array.Resize(Of T) to increase the size but this is will be quite inefficient.

Data types more in line for what you want to do is List<T>.

Upvotes: 0

Patrick Hofman
Patrick Hofman

Reputation: 157116

You can't add a new item in an array, you have to create a new array with size+1, copy all existing values, and then set the last item value.

An easier way is to use a List<int>, which will automatically resize if you run out of space. Calling the Add method suffices then.

Here a sample of an array resizing algorithm (Array.Resize could automate this, but this is just to show you how it should work):

int[] oldItems = new int[] { 1, 2, 3 };

int[] newItems = new int[oldItems.Length * 2];

for (int i = 0; i < oldItems.Length; i++)
{
    newItems[i] = oldItems[i];
}

newItems[oldItems.Length + 1] = 4;

Upvotes: 3

Harsh Jaswal
Harsh Jaswal

Reputation: 447

You cannot change the size of array like valuesHigherThanAverage.Length + 1. It has fixed size. You are crossing the upper bound of the array.

Upvotes: 0

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