import java.awt.Graphics;

public class SquareCube extends java.applet.Applet {
    double sq(double x) {
        double ax, ay, y;

//      ax = actual x, ay = actual y (not in pixels)
//           I want ax to range from -2 to 2

        ax = (x - size().width/2)/(size().width/4);
        ay = ax*ax;
        y = (-ay*size().height/4 + size().height/2);
        return y;
    }

    double cu(double x) {
        double ax, ay, y;

//      ax = actual x, ay = actual y (not in pixels)
//           I want ax to range from -2 to 2

        ax = (x - size().width/2)/(size().width/4);
        ay = ax*ax*ax;
        y = (-ay*size().height/4 + size().height/2);
        return y;
    }

    public void paint(Graphics g) {
        double y;

        // draw axes

        g.drawLine(0, size().height/2, size().width - 1, size().height/2);
        g.drawLine(size().width/2, 0, size().width/2, size().height - 1);
       
        // draw functions
 
        for (int x = 0 ; x < size().width ; x++) {
            y = sq(x);
            if (x >= 0 && y >= 0 && x < size().width && y < size().height) {
                g.drawLine(x, (int)sq(x), x + 1, (int)sq(x + 1));
                }
            y = cu(x);
            if (x >= 0 && y >= 0 && x < size().width && y < size().height) {
                g.drawLine(x, (int)cu(x), x + 1, (int)cu(x + 1));
                }
        }
    }
  public String getAppletInfo() {
    return "draws a x^2 and x^3 graph.";
  }
}