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import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.*;
/*
* Fix:
*/
public class Calculator {
public static void main(String[] args) {
JFrame cw = new JFrame();
cw.setTitle("Calculator");
cw.setPreferredSize(new Dimension(455, 638));
cw.setVisible(true);
cw.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
cw.getContentPane().setBackground(Color.BLUE);
cw.setResizable(false);
Container C = cw.getContentPane();
C.setLayout(null);
int counter = 1;
// JPanel backgroundJPanel = new JPanel();
// backgroundJPanel.setBackground(Color.BLUE);
// backgroundJPanel.setBounds(0, 0, 440, 600);
JTextArea screen = new JTextArea("0");
screen.setBounds(20, 420 - 210 - 190, 400, 160);
screen.setBackground(Color.YELLOW);
screen.setFont(new Font("Arial", Font.BOLD, 22));
screen.setBorder(BorderFactory.createLineBorder(Color.BLACK));
screen.setLineWrap(true);
screen.setWrapStyleWord(false);
screen.setOpaque(true);
screen.setEditable(false);
screen.setHighlighter(null);
screen.setAlignmentX(JTextArea.LEFT_ALIGNMENT);
screen.setAlignmentY(JTextArea.BOTTOM_ALIGNMENT);
cw.add(screen);
CalculatorButton zeroButton = new CalculatorButton(20, 700 - 190, 100, 70, "0", Color.YELLOW);
cw.add(zeroButton.myButton);
CalculatorButton periodButton = new CalculatorButton(120, 700 - 190, 100, 70, ".", Color.YELLOW);
cw.add(periodButton.myButton);
CalculatorButton equalsButton = new CalculatorButton(220, 700 - 190, 100, 70, "=", Color.YELLOW);
cw.add(equalsButton.myButton);
CalculatorButton plusButton = new CalculatorButton(320, 700 - 190, 100, 70, "+", Color.YELLOW);
cw.add(plusButton.myButton);
CalculatorButton minusButton = new CalculatorButton(320, 630 - 190, 100, 70, "-", Color.YELLOW);
cw.add(minusButton.myButton);
CalculatorButton multiplyButton = new CalculatorButton(320, 560 - 190, 100, 70, "*", Color.YELLOW);
cw.add(multiplyButton.myButton);
CalculatorButton divideButton = new CalculatorButton(320, 490 - 190, 100, 70, "/", Color.YELLOW);
cw.add(divideButton.myButton);
CalculatorButton clearButton = new CalculatorButton(320, 420 - 190, 100, 70, "CE", Color.YELLOW);
cw.add(clearButton.myButton);
CalculatorButton powerButton = new CalculatorButton(220, 420 - 190, 100, 70, "x^y", Color.YELLOW);
cw.add(powerButton.myButton);
CalculatorButton RparenthesisButton = new CalculatorButton(120, 420 - 190, 100, 70, ")", Color.YELLOW);
cw.add(RparenthesisButton.myButton);
CalculatorButton LparenthesisButton = new CalculatorButton(20, 420 - 190, 100, 70, "(", Color.YELLOW);
cw.add(LparenthesisButton.myButton);
for (int row = 1; row <= 3; row++) {
for (int column = 0; column < 3; column++) {
CalculatorButton numberButton = new CalculatorButton(20 + (100 * column), 700 - (70 * row) - 190, 100,
70,
counter + "", Color.YELLOW);
cw.add(numberButton.myButton);
final Integer innercounter = new Integer(counter);
numberButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if ((screen.getText().substring(screen.getText().length() - 1).equals("0"))
&& screen.getText().length() == 1)
screen.setText("");
screen.setText(screen.getText() + innercounter);
}
});
counter++;
}
}
LparenthesisButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if ((screen.getText().substring(screen.getText().length() - 1).equals("0"))
&& screen.getText().length() == 1)
screen.setText("");
screen.setText(screen.getText() + "(");
}
});
RparenthesisButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if ((screen.getText().substring(screen.getText().length() - 1).equals("0"))
&& screen.getText().length() == 1)
screen.setText("");
screen.setText(screen.getText() + ")");
}
});
powerButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (isNumber(screen.getText().substring(screen.getText().length() - 1)) ||
screen.getText().substring(screen.getText().length() - 1).equals(")"))
screen.setText(screen.getText() + "^");
}
});
periodButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (isNumber(screen.getText().substring(screen.getText().length() - 1)))
screen.setText(screen.getText() + ".");
}
});
zeroButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if ((screen.getText().substring(screen.getText().length() - 1).equals("0"))
&& screen.getText().length() == 1)
return;
screen.setText(screen.getText() + "0");
}
});
plusButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (isNumber(screen.getText().substring(screen.getText().length() - 1)) ||
screen.getText().substring(screen.getText().length() - 1).equals(")"))
screen.setText(screen.getText() + "+");
}
});
minusButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if ((screen.getText().substring(screen.getText().length() - 1).equals("0"))
&& screen.getText().length() == 1)
screen.setText("");
if (screen.getText().length() >= 2) {
if (screen.getText().substring(screen.getText().length() - 2).equals("--")) {
screen.setText(screen.getText());
return;
}
}
if (screen.getText().length() == 0)
screen.setText(screen.getText() + "-");
else {
if (!screen.getText().substring(screen.getText().length() - 1).equals("."))
screen.setText(screen.getText() + "-");
}
}
});
multiplyButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (isNumber(screen.getText().substring(screen.getText().length() - 1)) ||
screen.getText().substring(screen.getText().length() - 1).equals(")"))
screen.setText(screen.getText() + "*");
}
});
divideButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (isNumber(screen.getText().substring(screen.getText().length() - 1)) ||
screen.getText().substring(screen.getText().length() - 1).equals(")"))
screen.setText(screen.getText() + "/");
}
});
clearButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
screen.setText("0");
}
});
equalsButton.myButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
double ans = eval(screen.getText());
if ((ans + "").equals("0.0")) {
screen.setText("0");
} else {
screen.setText("" + ans);
}
}
});
KeyListener keyListener = new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {
if (screen.getText() == null || screen.getText().isEmpty() || screen.getText().length() == 1) {
screen.setText("0");
return;
}
screen.setText(screen.getText().substring(0, screen.getText().length() - 1));
}
}
@Override
public void keyReleased(KeyEvent e) {
// This method is called when a key is released
}
@Override
public void keyTyped(KeyEvent e) {
// This method is called when a key is typed (pressed and released)
}
};
// cw.add(backgroundJPanel);
cw.addKeyListener(keyListener);
cw.setFocusable(true);
cw.requestFocus();
cw.pack();
cw.setVisible(true);
cw.validate();
}
public static boolean isNumber(String str) {
try {
Double.parseDouble(str);
return true;
} catch (NumberFormatException e) {
return false;
}
}
public static double eval(final String str) {
return new Object() {
int pos = -1, ch;
void nextChar() {
ch = (++pos < str.length()) ? str.charAt(pos) : -1;
}
boolean eat(int charToEat) {
while (ch == ' ')
nextChar();
if (ch == charToEat) {
nextChar();
return true;
}
return false;
}
double parse() {
nextChar();
double x = parseExpression();
if (pos < str.length())
throw new RuntimeException("Unexpected: " + (char) ch);
return x;
}
// Grammar:
// expression = term | expression `+` term | expression `-` term
// term = factor | term `*` factor | term `/` factor
// factor = `+` factor | `-` factor | `(` expression `)` | number
// | functionName `(` expression `)` | functionName factor
// | factor `^` factor
double parseExpression() {
double x = parseTerm();
for (;;) {
if (eat('+'))
x += parseTerm(); // addition
else if (eat('-'))
x -= parseTerm(); // subtraction
else
return x;
}
}
double parseTerm() {
double x = parseFactor();
for (;;) {
if (eat('*'))
x *= parseFactor(); // multiplication
else if (eat('/'))
x /= parseFactor(); // division
else
return x;
}
}
double parseFactor() {
if (eat('+'))
return +parseFactor(); // unary plus
if (eat('-'))
return -parseFactor(); // unary minus
double x;
int startPos = this.pos;
if (eat('(')) { // parentheses
x = parseExpression();
if (!eat(')'))
throw new RuntimeException("Missing ')'");
} else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers
while ((ch >= '0' && ch <= '9') || ch == '.')
nextChar();
x = Double.parseDouble(str.substring(startPos, this.pos));
} else if (ch >= 'a' && ch <= 'z') { // functions
while (ch >= 'a' && ch <= 'z')
nextChar();
String func = str.substring(startPos, this.pos);
if (eat('(')) {
x = parseExpression();
if (!eat(')'))
throw new RuntimeException("Missing ')' after argument to " + func);
} else {
x = parseFactor();
}
if (func.equals("sqrt"))
x = Math.sqrt(x);
else if (func.equals("sin"))
x = Math.sin(Math.toRadians(x));
else if (func.equals("cos"))
x = Math.cos(Math.toRadians(x));
else if (func.equals("tan"))
x = Math.tan(Math.toRadians(x));
else
throw new RuntimeException("Unknown function: " + func);
} else {
throw new RuntimeException("Unexpected: " + (char) ch);
}
if (eat('^'))
x = Math.pow(x, parseFactor()); // exponentiation
return x;
}
}.parse();
}
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