FACTORIAL


/*
<applet code=factorial width=300 height=300>
</applet>
*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;


public class factorial extends Applet implements ActionListener
{
TextField tf,res;
Button chk;
public void init()
{
chk=new Button("  CLICK  ");
tf=new TextField(20);
res=new TextField(20);
add(tf);
add(res);
add(chk);
chk.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
int fact=1;
if(ae.getSource()==chk)
{
int no=Integer.parseInt(tf.getText());
for(int i=1;i<=no;i++)
{
fact=fact*i;
}
res.setText(Integer.toString(fact));
}
}//action per
}//class

OUTPUT:







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