A CODE FOR CALCULATOR
/* Java Program Example - Make Calculator */
import java.util.Scanner;
public class JavaProgram
{
public static void main(String args[])
{
float a, b, res;
char choice, ch;
Scanner scan = new Scanner(System.in);
do
{
System.out.print("1. Addition\n");
System.out.print("2. Subtraction\n");
System.out.print("3. Multiplication\n");
System.out.print("4. Division\n");
System.out.print("5. Exit\n\n");
System.out.print("Enter Your Choice : ");
choice = scan.next().charAt(0);
switch(choice)
{
case '1' : System.out.print("Enter Two Number : ");
a = scan.nextFloat();
b = scan.nextFloat();
res = a + b;
System.out.print("Result = " + res);
break;
case '2' : System.out.print("Enter Two Number : ");
a = scan.nextFloat();
b = scan.nextFloat();
res = a - b;
System.out.print("Result = " + res);
break;
case '3' : System.out.print("Enter Two Number : ");
a = scan.nextFloat();
b = scan.nextFloat();
res = a * b;
System.out.print("Result = " + res);
break;
case '4' : System.out.print("Enter Two Number : ");
a = scan.nextFloat();
b = scan.nextFloat();
res = a / b;
System.out.print("Result = " + res);
break;
case '5' : System.exit(0);
break;
default : System.out.print("Wrong Choice!!!");
break;
}
System.out.print("\n---------------------------------------\n");
}while(choice != 5);
}
}
GREAT CODE FOR CALCULATOR
//importing all essential packages(Step 1)
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
//Creating an another seperate class CalculatorFrame(Step 4)
class CalculatorFrame extends JFrame implements ActionListener
{
/* Creating all components and a container
that is going to be used in our program (Step 6)*/
Container c;
JLabel lbl;
JTextField tf;
JRadioButton on;
JRadioButton off;
JButton zero;
JButton one;
JButton two;
JButton three;
JButton four;
JButton five;
JButton six;
JButton seven;
JButton eight;
JButton nine;
JButton dot;
JButton clear;
JButton backspace;
JButton equal;
JButton mul;
JButton div;
JButton plus;
JButton minus;
JButton sqroot;
//Creating two double and one integer type variables(Step 7)
double num,ans;
int calculation;
// Creating constructor of CalculatorFrame class (Step 8)
CalculatorFrame()
{
//getting the content pane using getContentPane() method (Step 9)
c=this.getContentPane();
//Setting layout of the container to null (Step 10);
c.setLayout(null);
// Setting the background color of container (Step 11)
c.setBackground(Color.PINK);
// creating objects of all components (Step 12)
tf=new JTextField();
lbl=new JLabel();
on=new JRadioButton("on");
off=new JRadioButton("off");
seven=new JButton("7");
eight=new JButton("8");
nine=new JButton("9");
four=new JButton("4");
five=new JButton("5");
six=new JButton("6");
one=new JButton("1");
two=new JButton("2");
three=new JButton("3");
dot=new JButton(".");
zero=new JButton("0");
equal=new JButton("=");
plus=new JButton("+");
minus=new JButton("-");
mul=new JButton("x");
div=new JButton("/");
clear=new JButton("C");
backspace=new JButton("<--");
sqroot=new JButton("sqrt");
//Adjusting alignment to right for text entered in textfield(Step 13)
tf.setHorizontalAlignment(SwingConstants.RIGHT);
//Creating object of button group(Step 14)
ButtonGroup grp=new ButtonGroup();
grp.add(on);
grp.add(off);
on.setSelected(true);
on.setEnabled(false);
off.setEnabled(true);
//Setting font size for components(Step 15)
Font fo=new Font("Arial",Font.BOLD,20);
tf.setFont(fo);
seven.setFont(fo);
eight.setFont(fo);
nine.setFont(fo);
four.setFont(fo);
five.setFont(fo);
six.setFont(fo);
one.setFont(fo);
two.setFont(fo);
three.setFont(fo);
dot.setFont(fo);
zero.setFont(fo);
equal.setFont(fo);
plus.setFont(fo);
minus.setFont(fo);
mul.setFont(fo);
div.setFont(fo);
clear.setFont(fo);
Font font=new Font("Arial",Font.BOLD,15);
backspace.setFont(font);
/*Setting size and location of components
using setBounds() method(Step 16)*/
tf.setBounds(10,40,270,40);
lbl.setBounds(250,0,50,50);
on.setBounds(10,95,60,40);
off.setBounds(10,120,60,40);
clear.setBounds(80,110,60,40);
seven.setBounds(10,170,60,40);
eight.setBounds(80,170,60,40);
nine.setBounds(150,170,60,40);
four.setBounds(10,230,60,40);
five.setBounds(80,230,60,40);
six.setBounds(150,230,60,40);
one.setBounds(10,290,60,40);
two.setBounds(80,290,60,40);
three.setBounds(150,290,60,40);
dot.setBounds(10,350,60,40);
zero.setBounds(80,350,60,40);
equal.setBounds(150,350,60,40);
plus.setBounds(220,110,60,40);
minus.setBounds(220,170,60,40);
mul.setBounds(220,230,60,40);
div.setBounds(220,290,60,40);
backspace.setBounds(150,110,60,40);
sqroot.setBounds(220,350,60,40);
/*Adding components to container using
add() method(Step 17)*/
c.add(tf);
c.add(lbl);
c.add(on);
c.add(off);
c.add(seven);
c.add(eight);
c.add(nine);
c.add(four);
c.add(five);
c.add(six);
c.add(one);
c.add(two);
c.add(three);
c.add(dot);
c.add(zero);
c.add(equal);
c.add(plus);
c.add(minus);
c.add(mul);
c.add(div);
c.add(clear);
c.add(backspace);
c.add(sqroot);
//Registering action listener to buttons(Step 18)
on.addActionListener(this);
off.addActionListener(this);
seven.addActionListener(this);
eight.addActionListener(this);
nine.addActionListener(this);
four.addActionListener(this);
five.addActionListener(this);
six.addActionListener(this);
one.addActionListener(this);
two.addActionListener(this);
three.addActionListener(this);
dot.addActionListener(this);
zero.addActionListener(this);
equal.addActionListener(this);
plus.addActionListener(this);
minus.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
clear.addActionListener(this);
backspace.addActionListener(this);
sqroot.addActionListener(this);
}
// Performing actionPerformed() method for each registered buttons(Step 19)
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==on)
{
enable();
}
else if(e.getSource()==off)
{
disable();
}
else if(e.getSource()==clear)
{
tf.setText(" ");
lbl.setText(" ");
}
else if(e.getSource()==backspace)
{
int length=tf.getText().length();
int number=length-1;
if(length>0)
{
StringBuilder back=new StringBuilder(tf.getText());
back.deleteCharAt(number);
tf.setText(back.toString());
}
}
else if(e.getSource()==zero)
{
tf.setText(tf.getText()+"0");
}
else if(e.getSource()==one)
{
tf.setText(tf.getText()+"1");
}
else if(e.getSource()==two)
{
tf.setText(tf.getText()+"2");
}
else if(e.getSource()==three)
{
tf.setText(tf.getText()+"3");
}
else if(e.getSource()==four)
{
tf.setText(tf.getText()+"4");
}
else if(e.getSource()==five)
{
tf.setText(tf.getText()+"5");
}
else if(e.getSource()==six)
{
tf.setText(tf.getText()+"6");
}
else if(e.getSource()==seven)
{
tf.setText(tf.getText()+"7");
}
else if(e.getSource()==eight)
{
tf.setText(tf.getText()+"8");
}
else if(e.getSource()==nine)
{
tf.setText(tf.getText()+"9");
}
else if(e.getSource()==dot)
{
tf.setText(tf.getText()+".");
}
else if(e.getSource()==plus)
{
num=Double.parseDouble(tf.getText());
tf.setText(" ");
lbl.setText(num+"+");
calculation=1;
}
else if(e.getSource()==minus)
{
num=Double.parseDouble(tf.getText());
tf.setText(" ");
lbl.setText(num+"-");
calculation=2;
}
else if(e.getSource()==mul)
{
num=Double.parseDouble(tf.getText());
tf.setText(" ");
lbl.setText(num+"x");
calculation=3;
}
else if(e.getSource()==div)
{
num=Double.parseDouble(tf.getText());
tf.setText(" ");
lbl.setText(num+"/");
calculation=4;
}
else if(e.getSource()==sqroot)
{
num=Double.parseDouble(tf.getText());
ans=Math.sqrt(Double.parseDouble(tf.getText()));
tf.setText(Double.toString(ans));
}
else if(e.getSource()==equal)
{
switch(calculation)
{
case 1:
ans=num + Double.parseDouble(tf.getText());
tf.setText(Double.toString(ans));
lbl.setText(" ");
break;
case 2:
ans=num - Double.parseDouble(tf.getText());
tf.setText(Double.toString(ans));
lbl.setText(" ");
break;
case 3:
ans=num * Double.parseDouble(tf.getText());
tf.setText(Double.toString(ans));
lbl.setText(" ");
break;
case 4:
ans=num / Double.parseDouble(tf.getText());
tf.setText(Double.toString(ans));
lbl.setText(" ");
break;
}
}
}
public void disable()
{
tf.setText(" ");
lbl.setText(" ");
off.setEnabled(false);
on.setEnabled(true);
tf.setEnabled(false);
dot.setEnabled(false);
zero.setEnabled(false);
one.setEnabled(false);
two.setEnabled(false);
three.setEnabled(false);
four.setEnabled(false);
five.setEnabled(false);
six.setEnabled(false);
seven.setEnabled(false);
eight.setEnabled(false);
nine.setEnabled(false);
plus.setEnabled(false);
minus.setEnabled(false);
mul.setEnabled(false);
div.setEnabled(false);
equal.setEnabled(false);
clear.setEnabled(false);
backspace.setEnabled(false);
}
public void enable()
{
on.setEnabled(false);
off.setEnabled(true);
tf.setEnabled(true);
dot.setEnabled(true);
zero.setEnabled(true);
one.setEnabled(true);
two.setEnabled(true);
three.setEnabled(true);
four.setEnabled(true);
five.setEnabled(true);
six.setEnabled(true);
seven.setEnabled(true);
eight.setEnabled(true);
nine.setEnabled(true);
plus.setEnabled(true);
minus.setEnabled(true);
mul.setEnabled(true);
div.setEnabled(true);
equal.setEnabled(true);
clear.setEnabled(true);
backspace.setEnabled(true);
}
}
// Creating a class Calculator(Step 2)
class Calculator
{
//Creating main method (Step 3)
public static void main(String args[])
{
/*Creating object of CalculatorFrame
class and setting some of its properties (step 5) */
CalculatorFrame f=new CalculatorFrame();
f.setTitle("Calculator");
f.setVisible(true);
f.setBounds(100,100,300,440);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setResizable(false);
}
}
ANOTHER CODE FOR CALCULATOR
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Mycalculator
{
GridLayout gridlayout = new GridLayout(4,4);
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,bminus,bplus,bdivide,bmultiply,bequal,brem,bpercent;
Box box;
JPanel pane;
JLabel firstscreen, secondscreen, signscreen, resscreen;
ArrayList<Object> list;
JPanel firstText = new JPanel();
JPanel secondText = new JPanel();
JPanel signText = new JPanel();
JPanel resText = new JPanel();
Box theScreen = Box.createHorizontalBox();
public Mycalculator(){
box = Box.createVerticalBox();
list = new ArrayList<Object>();
firstscreen = new JLabel("");
firstText.add(firstscreen);firstText.setBackground(Color.BLUE);
signscreen = new JLabel("");
signText.add(signscreen);signText.setBackground(Color.BLUE);
secondscreen = new JLabel("");secondText.setBackground(Color.BLUE);
secondText.add(secondscreen);
resscreen = new JLabel("");resText.setBackground(Color.BLUE);
resText.add(resscreen);
theScreen.add(firstText);
theScreen.add(signText);
theScreen.add(secondText);
theScreen.add(resText);
box.add(theScreen);
box.add(Box.createVerticalStrut(40));
pane = new JPanel(gridlayout);
b0 = new JButton("0");
b1 = new JButton("1");
b2 = new JButton("2");
b3 = new JButton("3");
b4 = new JButton("4");
b5 = new JButton("5");
b6 = new JButton("6");
b7 = new JButton("7");
b8 = new JButton("8");
b9 = new JButton("9");
bequal = new JButton("=");
bdivide = new JButton("/");
bmultiply = new JButton("*");
bplus = new JButton("+");
bminus = new JButton("-");
brem = new JButton("REM");
bpercent = new JButton("%");
pane.add(b0);
pane.add(b1);
pane.add(b2);
pane.add(b3);
pane.add(b4);
pane.add(b5);
pane.add(b6);
pane.add(b7);
pane.add(b8);
pane.add(b9);
pane.add(bplus);
pane.add(bminus);
pane.add(bmultiply);
pane.add(bdivide);
pane.add(bpercent);
pane.add(brem);
pane.add(bequal);
b0.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b0);
}
});
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b1);
}
});
b2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b2);
}
});
b3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b3);
}
});
b4.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b4);
}
});
b5.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b5);
}
});
b6.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b6);
}
});
b7.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b7);
}
});
b8.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b8);
}
});
b9.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
resscreen.setText("");
verify(b9);
}
});
bplus.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
signverify(bplus);
}
});
bmultiply.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
signverify(bmultiply);
}
});
bminus.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
signverify(bminus);
}
});
brem.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
signverify(brem);
}
});
bdivide.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
signverify(bdivide);
}
});
bequal.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
double first = Double.parseDouble(String.valueOf(firstscreen.getText()));
double second = Double.parseDouble(String.valueOf(secondscreen.getText()));
String sign = signscreen.getText();
if(sign == "+"){
double results = first + second;
resscreen.setText(""+results);
firstscreen.setText("");
secondscreen.setText("");
signscreen.setText("");
}
if(sign == "*"){
double results = first * second;
resscreen.setText(""+results);
firstscreen.setText("");
secondscreen.setText("");
signscreen.setText("");
}
if(sign == "-"){
double results = first - second;
resscreen.setText(""+results);
firstscreen.setText("");
secondscreen.setText("");
signscreen.setText("");
}
if(sign == "REM"){
double results = first % second;
resscreen.setText(""+results);
firstscreen.setText("");
secondscreen.setText("");
signscreen.setText("");
}
if(sign == "/"){
double results = first % second;
resscreen.setText(""+results);
firstscreen.setText("");
secondscreen.setText("");
signscreen.setText("");
}
if(sign == "%"){
double results = first % second;
resscreen.setText(""+results);
firstscreen.setText("");
secondscreen.setText("");
signscreen.setText("");
}
}
});
box.add(pane);
JFrame frame = new JFrame("CORRECT");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(box);
frame.setSize(400,300);
frame.setVisible(true);
}
double result;
String value = null;
public void verify(JButton b){
if(resscreen.getText() == "" || resscreen.getText() == null){
if(signscreen.getText() == "" || signscreen.getText() == null){
value = firstscreen.getText()+b.getText();
firstscreen.setText(value);
}else{
value = secondscreen.getText()+b.getText();
secondscreen.setText(value);
}
}
}
public void signverify(JButton b){
if(firstscreen.getText() == "" || firstscreen.getText() == null){
value = "";
firstscreen.setText(value);
}else{
value = b.getText();
signscreen.setText(value);
}
}
public static void main(String[] args){
new Mycalculator();
}
}
ANOTHER CODE FOR CALCULATOR
//Imports are listed in full to show what's being used
//could just import javax.swing.* and java.awt.* etc..
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.Container;
public class SimpleCalc implements ActionListener{
JFrame guiFrame;
JPanel buttonPanel;
JTextField numberCalc;
int calcOperation = 0;
int currentCalc;
//Note: Typically the main method will be in a
//separate class. As this is a simple one class
//example it's all in the one class.
public static void main(String[] args) {
//Use the event dispatch thread for Swing components
EventQueue.invokeLater(new Runnable()
{
@Override
public void run()
{
new SimpleCalc();
}
});
}
public SimpleCalc()
{
guiFrame = new JFrame();
//make sure the program exits when the frame closes
guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
guiFrame.setTitle("Simple Calculator");
guiFrame.setSize(300,300);
//This will center the JFrame in the middle of the screen
guiFrame.setLocationRelativeTo(null);
numberCalc = new JTextField();
numberCalc.setHorizontalAlignment(JTextField.RIGHT);
numberCalc.setEditable(false);
guiFrame.add(numberCalc, BorderLayout.NORTH);
buttonPanel = new JPanel();
//Make a Grid that has three rows and four columns
buttonPanel.setLayout(new GridLayout(4,3));
guiFrame.add(buttonPanel, BorderLayout.CENTER);
//Add the number buttons
for (int i=1;i<10;i++)
{
addButton(buttonPanel, String.valueOf(i));
}
JButton addButton = new JButton("+");
addButton.setActionCommand("+");
OperatorAction subAction = new OperatorAction(1);
addButton.addActionListener(subAction);
JButton subButton = new JButton("-");
subButton.setActionCommand("-");
OperatorAction addAction = new OperatorAction(2);
subButton.addActionListener(addAction);
JButton equalsButton = new JButton("=");
equalsButton.setActionCommand("=");
equalsButton.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent event)
{
if (!numberCalc.getText().isEmpty())
{
int number = Integer.parseInt(numberCalc.getText());
if (calcOperation == 1)
{
int calculate = currentCalc + number;
numberCalc.setText(Integer.toString(calculate));
}
else if (calcOperation == 2)
{
int calculate = currentCalc - number;
numberCalc.setText(Integer.toString(calculate));
}
}
}
});
buttonPanel.add(addButton);
buttonPanel.add(subButton);
buttonPanel.add(equalsButton);
guiFrame.setVisible(true);
}
//All the buttons are following the same pattern
//so create them all in one place.
private void addButton(Container parent, String name)
{
JButton but = new JButton(name);
but.setActionCommand(name);
but.addActionListener(this);
parent.add(but);
}
//As all the buttons are doing the same thing it's
//easier to make the class implement the ActionListener
//interface and control the button clicks from one place
@Override
public void actionPerformed(ActionEvent event)
{
//get the Action Command text from the button
String action = event.getActionCommand();
//set the text using the Action Command text
numberCalc.setText(action);
}
private class OperatorAction implements ActionListener
{
private int operator;
public OperatorAction(int operation)
{
operator = operation;
}
public void actionPerformed(ActionEvent event)
{
currentCalc = Integer.parseInt(numberCalc.getText());
calcOperation = operator;
}
}
}
CODE FOR CALCULATOR
import javax.swing.*;
import java.awt.event.*;
class Calc implements ActionListener
{
JFrame f;
JTextField t;
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,bdiv,bmul,bsub,badd,bdec,beq,bdel,bclr;
static double a=0,b=0,result=0;
static int operator=0;
Calc()
{
f=new JFrame("Calculator");
t=new JTextField();
b1=new JButton("1");
b2=new JButton("2");
b3=new JButton("3");
b4=new JButton("4");
b5=new JButton("5");
b6=new JButton("6");
b7=new JButton("7");
b8=new JButton("8");
b9=new JButton("9");
b0=new JButton("0");
bdiv=new JButton("/");
bmul=new JButton("*");
bsub=new JButton("-");
badd=new JButton("+");
bdec=new JButton(".");
beq=new JButton("=");
bdel=new JButton("Delete");
bclr=new JButton("Clear");
t.setBounds(30,40,280,30);
b7.setBounds(40,100,50,40);
b8.setBounds(110,100,50,40);
b9.setBounds(180,100,50,40);
bdiv.setBounds(250,100,50,40);
b4.setBounds(40,170,50,40);
b5.setBounds(110,170,50,40);
b6.setBounds(180,170,50,40);
bmul.setBounds(250,170,50,40);
b1.setBounds(40,240,50,40);
b2.setBounds(110,240,50,40);
b3.setBounds(180,240,50,40);
bsub.setBounds(250,240,50,40);
bdec.setBounds(40,310,50,40);
b0.setBounds(110,310,50,40);
beq.setBounds(180,310,50,40);
badd.setBounds(250,310,50,40);
bdel.setBounds(60,380,100,40);
bclr.setBounds(180,380,100,40);
f.add(t);
f.add(b7);
f.add(b8);
f.add(b9);
f.add(bdiv);
f.add(b4);
f.add(b5);
f.add(b6);
f.add(bmul);
f.add(b1);
f.add(b2);
f.add(b3);
f.add(bsub);
f.add(bdec);
f.add(b0);
f.add(beq);
f.add(badd);
f.add(bdel);
f.add(bclr);
f.setLayout(null);
f.setVisible(true);
f.setSize(350,500);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setResizable(false);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
b0.addActionListener(this);
badd.addActionListener(this);
bdiv.addActionListener(this);
bmul.addActionListener(this);
bsub.addActionListener(this);
bdec.addActionListener(this);
beq.addActionListener(this);
bdel.addActionListener(this);
bclr.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)
t.setText(t.getText().concat("1"));
if(e.getSource()==b2)
t.setText(t.getText().concat("2"));
if(e.getSource()==b3)
t.setText(t.getText().concat("3"));
if(e.getSource()==b4)
t.setText(t.getText().concat("4"));
if(e.getSource()==b5)
t.setText(t.getText().concat("5"));
if(e.getSource()==b6)
t.setText(t.getText().concat("6"));
if(e.getSource()==b7)
t.setText(t.getText().concat("7"));
if(e.getSource()==b8)
t.setText(t.getText().concat("8"));
if(e.getSource()==b9)
t.setText(t.getText().concat("9"));
if(e.getSource()==b0)
t.setText(t.getText().concat("0"));
if(e.getSource()==bdec)
t.setText(t.getText().concat("."));
if(e.getSource()==badd)
{
a=Double.parseDouble(t.getText());
operator=1;
t.setText("");
}
if(e.getSource()==bsub)
{
a=Double.parseDouble(t.getText());
operator=2;
t.setText("");
}
if(e.getSource()==bmul)
{
a=Double.parseDouble(t.getText());
operator=3;
t.setText("");
}
if(e.getSource()==bdiv)
{
a=Double.parseDouble(t.getText());
operator=4;
t.setText("");
}
if(e.getSource()==beq)
{
b=Double.parseDouble(t.getText());
switch(operator)
{
case 1: result=a+b;
break;
case 2: result=a-b;
break;
case 3: result=a*b;
break;
case 4: result=a/b;
break;
default: result=0;
}
t.setText(""+result);
}
if(e.getSource()==bclr)
t.setText("");
if(e.getSource()==bdel)
{
String s=t.getText();
t.setText("");
for(int i=0;i<s.length()-1;i++)
t.setText(t.getText()+s.charAt(i));
}
}
public static void main(String...s)
{
new Calc();
}
}
