Algorithm: efficient way to remove duplicate integers from an array

Question

I got this problem from an interview with Microsoft.

Given an array of random integers, write an algorithm in C that removes duplicated numbers an

Answer 1

How about:

void rmdup(int *array, int length)
{
    int *current , *end = array + length - 1;

    for ( current = array + 1; array < end; array++, current = array + 1 )
    {
        while ( current <= end )
        {
            if ( *current == *array )
            {
                *current = *end--;
            }
            else
            {
                current++;
            }
        }
    }
}

Should be O(n^2) or less.