| TecBrain |
Dec 28th, 2005 8:04 AM |
calculator
I am currently working on a java calculator, I do have a little problem, if the user inputs the value of zero on the textbox on continues then only the first zero should be recognized.
For example:
000000 should be only recognized as 0, am not sure how to do that, also after the user click on the AC button the text area becomes 0 and if immediately enters a number then it becomes 04..... Any Help would be appreciated.
Thanks.
This is my code
:
/*
* Main.java
* Created on December 18, 2005, 12:09 PM
*
*
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class IntegerCalculator extends JApplet implements ActionListener{
//public class IntegerCalculator extends JApplet {
/* graphical user interface components */
private JLabel label;
private JTextField result;
private final String names[] = {"7", "8", "9", "4","5","6", "1","2","3","0", "*", "/", "%", "+","-", "=", "AC"};
private JButton button[];
private JButton dumy1, dumy2, dumy3,dumy4;
private boolean secondN = false;
private boolean operator = false;
private long n1 = 0, n2 =0 ;
private String s1, s2;
private int count = 0, oper = 18;
private GridLayout grid1;
private Container container;
/* public void IntegerCalculator() {
init();
System.out.println("\n end init \n");
}
*/
/** set up GUI components*/
public void init() {
// set up applet’s GUI
// obtain content pane and set its layout to FlowLayout
grid1 = new GridLayout(9, 3, 5, 5);
container = getContentPane();
container.setLayout( grid1 );
//Container container = getContentPane();
//container.setLayout( new GridLayout(9, 3, 2, 2) );
// create numberLabel and attach it to content pane
label = new JLabel("Basic Calculator", JLabel.CENTER);
container.add(label);
container.setBackground(Color.gray);
// container.setForeground(Color.gray);
result = new JTextField(9);
//result.setBounds(10,10,50,10);
result.setEditable(true);
container.add(result);
result.setText("");
// register this applet as numberField’s ActionListener
result.addActionListener( this );
dumy1 = new JButton ("");
dumy1.addActionListener(this);
container.add(dumy1);
dumy1.setVisible(false);
dumy2 = new JButton ("");
dumy2.addActionListener(this);
container.add(dumy2);
dumy2.setVisible(false);
dumy3 = new JButton ("");
dumy3.addActionListener(this);
container.add(dumy3);
dumy3.setVisible(false);
dumy4 = new JButton ("");
dumy4.addActionListener(this);
container.add(dumy4);
dumy4.setVisible(false);
button = new JButton[names.length];
for (int i=0; i < names.length; i++){
button[i] = new JButton (names[i]);
button[i].addActionListener(this);
container.add(button[i]);
}
setSize( 300, 150 );
setVisible(true);
}
public void NumericB (int i){
String s = new String();
s = result.getText();
s = s + String.valueOf(i);
if (count < 10)
{
result.setText(s);
count++;
}
}
public void OperatorB (int i)
{
}
public void actionPerformed(ActionEvent e){
Object src = e.getSource();
String s = new String( "");
// s = result.getText();
if (src instanceof JButton)
{
if(src == button[0])
{
// result.setText("");
NumericB(7);
}
else if(src == button[1])
{
// result.setText("");
NumericB(8);
}
else if(src == button[2])
{
// result.setText("");
NumericB(9);
}
else if(src == button[3])
{
// result.setText("");
NumericB(4);
}
else if(src == button[4])
{
// result.setText("");
NumericB(5);
}
else if(src == button[5])
{
// result.setText("");
NumericB(6);
}
else if(src == button[6])
{
// result.setText("");
NumericB(1);
}
else if(src == button[7])
{
// result.setText("");
NumericB(2);
}
else if(src == button[8])
{
// result.setText("");
NumericB(3);
}
else if(src == button[9])
{
// result.setText("");
NumericB(0);
}
else if(src == button[10]) { // "*"
{
oper = 11;
s = result.getText();
n1 = Long.parseLong(s);
count = 0;
operator = true;
result.setText("");
}
}
else if(src == button[11] ) { // "/"
oper = 12;
n1 = Long.parseLong(result.getText());
count = 0;
operator = true;
result.setText("");
}
else if(src == button[12] ) { // "%"
oper = 13;
n1 = Long.parseLong(result.getText());
count = 0;
operator = true;
result.setText("");
}
else if(src == button[13] ) { // "+"
oper = 14;
n1 = Long.parseLong(result.getText());
count = 0;
operator = true;
result.setText("");
}
else if(src == button[14] ) { // "-"
n1 = Long.parseLong(result.getText());
count = 0;
operator = true;
result.setText("");
oper = 15;
}
else if(src == button[15]) { // "="
if((operator == true)&&(oper!=0))
{
s = result.getText();
n2 = Long.parseLong(s);
makeCalculations();
oper = 0;
}
}
else if(src == button[16] ) { // "AC"
oper = 17;
n1 = Long.parseLong(result.getText());
count = 0;
operator = true;
result.setText("0");
//button[16].setNextFocusableComponent(result);
}
}
}
private void makeCalculations(){
long ans=0;
switch (oper)
{
case 11:
ans = n1 * n2;
break;
case 12:
ans = n1/n2;
break;
case 13:
ans = n1%n2;
break;
case 14:
ans = n1+n2;
break;
case 15:
ans = n1 - n2;
break;
}
result.setText(String.valueOf(ans));
}
}
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