import java.awt.*;
import java.applet.*;

public class Ecuatie2 extends Applet
{
   private double a, b, c, x1, x2;
   private  TextField coefA, coefB, coefC;
   private Label lA, lB, lC, rez;
   private String prompt;
   private Button sol;


   public void init()
    {
        setFont(new Font("Arial", Font.PLAIN, 11));

        setLayout(new FlowLayout(FlowLayout.RIGHT));
        add(lA = new Label("a="));
        add(coefA = new TextField("", 10));
        add(lB = new Label("b="));
        add(coefB = new TextField("", 10));
        add(lC = new Label("c="));
        add(coefC = new TextField("", 10));

        add(sol = new Button("Sol"));
        add(rez = new Label("----------------------------------------"));
        resize(300, 300);
  }
  public boolean action(Event ev, Object objev)
    {
       String fis, a1, b1, c1;
       double delta, x1, x2;

       if(ev.id == Event.ACTION_EVENT && ev.target instanceof Button)
         {
            if(objev.equals("Sol"))
              {
                a1 = coefA.getText();
                b1 = coefB.getText();
                c1 = coefC.getText();

                if(a1 == null)
                  {
                   if(b1 == null)
                     {
                      if(c1 == null)
                        prompt = "Coeficienti nevalizi.";
                      else
                        prompt = "Ecutie imposibila";
                     }
                   else
                     {
                        b = (Double.valueOf(b1)).doubleValue();
                        c = (Double.valueOf(c1)).doubleValue();
                        x1 = -c/b;
                        prompt = "x1 = " + x1;
                     }
                  }
                else
                   {
                        a = (Double.valueOf(a1)).doubleValue();
                        b = (Double.valueOf(b1)).doubleValue();
                        c = (Double.valueOf(c1)).doubleValue();
                        delta = b*b - 4*a*c;
                        if(delta < 0)
                            prompt = "Solutii complexe.";
                        else
                          if(delta == 0)
                             {
                                x1 = x2 = -b/2*a;
                                prompt = "x1 = " + x1 + "   x2 = " + x1;
                             }
                          else
                             {
                                x1 = (-b + Math.sqrt(delta))/2*a;
                                x2 = (-b - Math.sqrt(delta))/2*a;
                                prompt = "x1 = " + x1 + "   x2 = " + x2;
                             }

                   }
                    rez.setText(prompt);
                return true;
              }
          }
       return false;
    }


}