public class DataSet {

    private static final int DEFAULT_DATA_SET_SIZE = 100;

    public DataSet() {
        this(DEFAULT_DATA_SET_SIZE );
    }

    public DataSet( int dataSetSize ) {
        data = new int[dataSetSize];
        numData = 0;
    }

    // add a single integer to the data set.
    public void addValue( int x ) {
        if (numData < data.length) {
            data[numData] = x;
            ++numData;
        }
    }

    // add an array of integers to the data set
//    public void addValue( int[] x ) {
//
////        for( int item : x )
////            addValue( item );
//        addValue( x, x.length );
//
//    }

    // add a partially filled  array of  N integers to the data set
    public void addValue( int[] x, int n) {

        for( int k = 0; k < n; ++k  )
            addValue( x[k] );

    }

    public void addValue( int ... x ) {

        for( int k = 0; k < x.length; ++k )
            addValue( x[k]);


    }

    public int getLargest() {

        int largest = Integer.MIN_VALUE;
        for( int k = 0; k < numData; ++k)
            if( largest < data[k] )
                largest = data[k];
        return largest;

    }

    public int getSmallest() {
        int smallest = Integer.MAX_VALUE;
        for( int k = 0; k < numData; ++k)
            if( smallest > data[k] )
                smallest = data[k];
        return smallest;
    }

    public int size() {
        return numData;
    }

    public double average() {
        double avg = 0;

        int sumData = 0;
        for( int k = 0 ; k < numData; ++k )
            sumData += data[k];

        if( numData > 0 ) {
            avg = (double) sumData / numData;
        }
        return avg;
    }

    public int[] getValues() {

        if( numData <= 0)
            return null;

        int [] copy = new int[numData];

        for( int k = 0; k < numData; ++k )
            copy[k] = data[k];

        return copy;
    }

    private int []data;
    private int numData;
}