import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class main extends MIDlet implements commandListener{

public int a,b,c,d;
public TextField at,bt,ct;
public Command ok,exit;
public Form form;

 public void startApp() {

form=new Form("dis");
at=new TextField("a","",9,TextField.ANY);
bt=new TextField("b","",9,TextField.ANY);
ct=new TextField("c","",9,TextField.ANY);
ok=new Command("ok",Command.OK,1);
exit=new Command("exit",Command.EXIT,2);
form.addCommand(ok);
form.addCommand(exit);
form.append(at);
form.append(bt);
form.append(ct);
form.setCommandListener(this);



Display.getDisplay(this).setCurrent(form);







 }

 public void pauseApp() {
 }

 public void destroyApp(boolean unconditional) {
notifyDestroyed();
 }
public void commandAction(Command c,Displayable dis){
if(c==exit){
destroyApp(true);
notifyDestroyed();
}
if(c==ok){
a=String.toInteger(at.getString());
b=String.toInteger(bt.getString());
c=String.toInteger(ct.getString());
d=b*b-4*a*c;
form.append(d);
}
}
}