import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class gui1{
static double a=0;
static int op=0;
public static void main(String ar[]){
JFrame f1=new JFrame("Calculator");
f1.setLayout(null);
final JTextField t1=new JTextField(100);
t1.setBounds(10,10,200,30);
JButton b0=new JButton("0");
JButton b1=new JButton("1");
JButton b2=new JButton("2");
JButton b3=new JButton("3");
JButton b4=new JButton("4");
JButton b5=new JButton("5");
JButton b6=new JButton("6");
JButton b7=new JButton("7");
JButton b8=new JButton("8");
JButton b9=new JButton("9");
JButton dot=new JButton(".");
JButton add=new JButton("+");
JButton sub=new JButton("-");
JButton equal=new JButton("=");
JButton div=new JButton("%");
JButton mul=new JButton("x");
JPanel buttonPanel=new JPanel();
buttonPanel.setBounds(10,60,200,150);
buttonPanel.setBackground(Color.gray);
//buttonPanel.pack();
buttonPanel.setLayout(new GridLayout(4,4,5,5));
buttonPanel.add(b7);
buttonPanel.add(b8);
buttonPanel.add(b9);
buttonPanel.add(div);
buttonPanel.add(b4);
buttonPanel.add(b5);
buttonPanel.add(b6);
buttonPanel.add(mul);
buttonPanel.add(b1);
buttonPanel.add(b2);
buttonPanel.add(b3);
buttonPanel.add(sub);
buttonPanel.add(b0);
buttonPanel.add(dot);
buttonPanel.add(equal);
buttonPanel.add(add);
class MyListener1 implements ActionListener{
public void actionPerformed(ActionEvent e){
String cmd=e.getActionCommand();
if(cmd.equals("+")){
a=Double.parseDouble(t1.getText());
op=1;
t1.setText("");
}else if(cmd.equals("-")){
a=Double.parseDouble(t1.getText());
op=2;
t1.setText("");
}else if(cmd.equals("x")){
a=Double.parseDouble(t1.getText());
op=3;
t1.setText("");
}
else if(cmd.equals("%")){
a=Double.parseDouble(t1.getText());
op=4;
t1.setText("");
}else if(cmd.equals("=")){
double b=Double.parseDouble(t1.getText());
double c=0;
switch(op){
case 1:c=a+b;break;
case 2:c=a-b;break;
case 3:c=a*b;break;
case 4:c=a/b;break;
default :c=0;
}
t1.setText(""+c);
}
else if(cmd.equals("0")){
t1.setText(t1.getText().concat("0"));
}else if(cmd.equals("1")){
t1.setText(t1.getText().concat("1"));
}else if(cmd.equals("2")){
t1.setText(t1.getText().concat("2"));
}else if(cmd.equals("3")){
t1.setText(t1.getText().concat("3"));
}else if(cmd.equals("4")){
t1.setText(t1.getText().concat("4"));
}else if(cmd.equals("5")){
t1.setText(t1.getText().concat("5"));
}else if(cmd.equals("6")){
t1.setText(t1.getText().concat("6"));
}else if(cmd.equals("7")){
t1.setText(t1.getText().concat("7"));
}else if(cmd.equals("8")){
t1.setText(t1.getText().concat("8"));
}else if(cmd.equals("9")){
t1.setText(t1.getText().concat("9"));
}else if(cmd.equals(".")){
t1.setText(t1.getText().concat("."));
}
}
}
MyListener1 ml=new MyListener1();
add.addActionListener(ml);
sub.addActionListener(ml);
mul.addActionListener(ml);
div.addActionListener(ml);
equal.addActionListener(ml);
b0.addActionListener(ml);
b1.addActionListener(ml);
b2.addActionListener(ml);
b3.addActionListener(ml);
b4.addActionListener(ml);
b5.addActionListener(ml);
b6.addActionListener(ml);
b7.addActionListener(ml);
b8.addActionListener(ml);
b9.addActionListener(ml);
dot.addActionListener(ml);
f1.add(t1);
f1.add(buttonPanel);
f1.setBounds(300,200,230,250);
f1.setVisible(true);
}
}
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