Remove Duplicates From an int array

Question

I am begginner in C# and I need your help on writing a program which will remove the duplicates from an integer array?

I tried but not sure how will I assign Null value to int type?

public void RemoveDuplicates(int[] A)

{

for (int i = 0, j = A.Length - 1; i <= j; i++, j--)

{

if (A[i] == A[j])

{

A[j] = 0;

}

Console.WriteLine(A[i]);

}

I also tried using an ArrayList where I will check if the arraylist already contains the element if not add else do nothing.

Thanks for your time in advance

Alan · Answer

Try this: public void RemoveDuplicates(ref int[] A) { Array.Sort(A); ArrayList list = new ArrayList(A); for (int i = list.Count - 1; i > 0; i--) { if ((int)list[i] == (int)list[i-1]) list.RemoveAt(i); } A = (int[])list.ToArray(typeof(int)); } Notice that you need to pass the array variable by reference as you're assigning a different array object to it after the duplicates have been removed. The array is also sorted into numeric order as a by product.