// Trace1 Example.

// Draw the reference diagram, trace the instance
// variable changes and predict the output.

public class A
{
    private int w;
    private int h;

    public A( )
    {
        w = 3;
        h = 4;
    }

    public A(int x, int y)
    {
        w = x;
        h = y;
    }

    public int getW( )
    {
        return w;
    }

    public int getH( )
    {
        return h;
    }

    public void f(int x)
    {
        w += x;
        h += 7;
    }

    public String toString( )
    {
        return h + "x" + w;
    }
}