JAVA CALCULATOR

import java.*;

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

/*<applet code="calculator" width=500 height=500>

</applet>*/

public class calculator extends Applet implements ActionListener

{

Label l1,l2;

Button b1,b2,b3,b4,b5;

TextField t1,t2;

public void init()                    

{

setLayout(null);

l1=new Label("number");

l2=new Label("number");

b1=new Button("add+");

b2=new Button("sub- ");

b3=new Button("mul*");

b4=new Button("div/");

b5=new Button("clear");

t1=new TextField(20);

t2=new TextField(20);

add(l1);

l1.setBounds(10,10,60,40);

add(l2);

l2.setBounds(10,70,60,40);

add(t1);

t1.setBounds(90,10,100,40);

add(t2);

t2.setBounds(90,70,100,40);

add(b1);

b1.setBounds(30,200,50,50);

add(b2);

b2.setBounds(100,200,50,50);

add(b3);

b3.setBounds(170,200,50,50);

add(b4);

b4.setBounds(240,200,50,50);

add(b5);

b5.setBounds(350,200,50,50);

b1.addActionListener(this);

b2.addActionListener(this);

b3.addActionListener(this);

b4.addActionListener(this);

b5.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{

float a,b,c;

if(e.getSource()==b5)

{

t1.setText("");

t2.setText("");

t1.requestFocus();

}

a=Float.parseFloat(t1.getText());

b=Float.parseFloat(t2.getText());

showStatus("calculator");

if(e.getSource()==b1)

{

c=a+b;

t1.setText(""+c);

t2.setText("");

t2.requestFocus();

}

else if(e.getSource()==b2)

{

c=a-b;

t1.setText(""+c);

t2.setText("");

t2.requestFocus();

}

else if(e.getSource()==b3)

{

c=a*b;

t1.setText(""+c);

t2.setText("");

t2.requestFocus();

}

else if(e.getSource()==b4)

{

c=a/b;

t1.setText(""+c);

t2.setText("");

t2.requestFocus();

}

}

}