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| package com.udojava.evalex;
import java.math.BigDecimal;
import java.awt.*;
import java.awt.event.*;
public class Calculator
extends Frame
implements ActionListener, KeyListener {
final int ROW = 6;
final int COLUMN = 5;
TextField tfInput ;
Panel panel;
String btnString[] = {"C", "←", "(", ")", "%",
"sin", "√", "x²", "xⁿ", "÷",
"cos", "7", "8", "9", "×",
"tan", "4", "5", "6", "-",
"ln", "1", "2", "3", "+",
"π", "e", "0", ".", "="};
Button btn[] = new Button[ROW * COLUMN];
public Calculator() {
Font f = new Font("Garamond", Font.PLAIN, 18);
tfInput = new TextField(10);
tfInput.setFont(f);
tfInput.addKeyListener(this);
panel = new Panel();
add(tfInput, "North");
add(panel, "Center");
panel.setLayout(new GridLayout(ROW, COLUMN));
for (int i = 0; i < ROW * COLUMN; i++) {
btn[i] = new Button(btnString[i]);
btn[i].setFont(f);
btn[i].addActionListener(this);
btn[i].addKeyListener(this);
panel.add(btn[i]);
}
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
}
public static void main(String[] args) {
Calculator c = new Calculator();
c.setTitle("Calculator");
c.setSize(250, 300);
c.setResizable(true);
c.setVisible(true);
}
public void actionPerformed(ActionEvent ae) {
String command = ae.getActionCommand();
String input = tfInput.getText();
if (command.equals("C")) {
tfInput.setText("");
}
else if (command.equals("←")) {
if (input.length() == 0) {
return;
}
String text = input.substring(0, input.length() - 1);
tfInput.setText(text);
}
else if (command.equals("√")) {
tfInput.setText(input + "sqrt(");
}
else if (command.equals("x²")) {
tfInput.setText(input + "^2");
}
else if (command.equals("xⁿ")) {
tfInput.setText(input + "^");
}
else if (command.equals("÷")) {
tfInput.setText(input + "/");
}
else if (command.equals("×")) {
tfInput.setText(input + "*");
}
else if (command.equals("sin")) {
tfInput.setText(input + "sin(");
}
else if (command.equals("cos")) {
tfInput.setText(input + "cos(");
}
else if (command.equals("tan")) {
tfInput.setText(input + "tan(");
}
else if (command.equals("ln")) {
tfInput.setText(input + "log(");
}
else if (command.equals("π")) {
tfInput.setText(input + "pi");
}
else if (command.equals("=")) {
calculate();
}
else {
tfInput.setText(input + command);
}
}
public void keyTyped(KeyEvent e) {}
public void keyReleased(KeyEvent e) {}
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == 10) {
calculate();
}
}
private void calculate() {
BigDecimal result = null;
String input = tfInput.getText();
Expression ex = new Expression(input);
try {
result = ex.eval();
String text = result.toString();
tfInput.setText(text);
} catch (Exception e) {
System.out.println(e.getMessage());
tfInput.setText(e.getMessage());
}
}
} |
(
Сообщение от garo21
Сообщение было отмечено garo21 как решение
