private double factorial(int n) n == 1) return 1; double result = 1; for (int i = 2; i <= n; i++) result *= i; return result;
public CalculatorEngine() this.memory = 0; scientific calculator source code in java free download
private void addButtons() GridBagConstraints gbc = new GridBagConstraints(); gbc.fill = GridBagConstraints.BOTH; gbc.weightx = 1; gbc.weighty = 1; gbc.insets = new Insets(2, 2, 2, 2); String[][] buttons = "sin", "cos", "tan", "asin", "acos", "atan", "sinh", "cosh", "tanh", "log", "ln", "√", "x²", "x³", "xʸ", "eˣ", "10ˣ", "∛", "1/x", ", "π", "e", "(", ")", "C", "CE", "7", "8", "9", "/", "mod", "rand", "4", "5", "6", "*", "xʸ", "xʸ", "1", "2", "3", "-", "xʸ", "xʸ", "0", ".", "+/-", "+", "=", "xʸ" ; int row = 0; for (String[] buttonRow : buttons) int col = 0; for (String btnText : buttonRow) gbc.gridx = col; gbc.gridy = row; JButton button = createStyledButton(btnText); // Special sizing for equals button if (btnText.equals("=")) gbc.gridheight = 2; button.setBackground(new Color(76, 175, 80)); button.setForeground(Color.WHITE); else gbc.gridheight = 1; button.addActionListener(new ButtonClickListener(btnText)); buttonPanel.add(button, gbc); col++; row++; gbc.gridheight = 1; // Reset private double factorial(int n) n == 1) return
public void setAngleMode(boolean degree) this.degreeMode = degree; double result = 1
private class ButtonClickListener implements ActionListener private String command; public ButtonClickListener(String command) this.command = command; @Override public void actionPerformed(ActionEvent e) String currentText = displayField.getText(); switch (command) case "C": engine.clear(); displayField.setText("0"); break; case "CE": engine.clearEntry(); displayField.setText("0"); break; case "=": try String result = engine.calculate(currentText, isDegree); displayField.setText(result); catch (Exception ex) displayField.setText("Error"); break; case "+/-": if (currentText.startsWith("-")) displayField.setText(currentText.substring(1)); else if (!currentText.equals("0")) displayField.setText("-" + currentText); break; case "sin": case "cos": case "tan": case "asin": case "acos": case "atan": case "sinh": case "cosh": case "tanh": case "log": case "ln": case "√": case "∛": case "x²": case "x³": case "1/x": case "