Scientific - Calculator Source Code In Java Free Download

// Inner class for expression evaluation using Shunting-yard algorithm private class ExpressionEvaluator public double evaluate(String expression) return evaluateExpression(expression); private double evaluateExpression(String expr) Stack<Double> values = new Stack<>(); Stack<Character> operators = new Stack<>(); for (int i = 0; i < expr.length(); i++) while (!operators.isEmpty()) values.push(applyOperation(operators.pop(), values.pop(), values.pop())); return values.pop(); private boolean isOperator(char c) return c == '+' private boolean hasPrecedence(char op1, char op2) private double applyOperation(char op, double b, double a) switch (op) case '+': return a + b; case '-': return a - b; case '*': return a * b; case '/': if (b == 0) throw new ArithmeticException("Division by zero"); return a / b; case '%': return a % b; default: return 0;

private double factorial(int n) if (n < 0) return Double.NaN; if (n == 0

public void clear() memory = 0;

private JButton createStyledButton(String text) scientific calculator source code in java free download

public static void main(String[] args) SwingUtilities.invokeLater(() -> try UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); catch (Exception e) e.printStackTrace(); new ScientificCalculator().setVisible(true); );

public ScientificCalculator() engine = new CalculatorEngine(); initializeUI(); setTitle("Scientific Calculator"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setResizable(false); pack(); setLocationRelativeTo(null);

📋 Overview A scientific calculator built in Java Swing with support for basic arithmetic, trigonometric functions, logarithms, exponents, and more. This is a complete, ready-to-run project. 📁 Project Structure ScientificCalculator/ ├── src/ │ ├── ScientificCalculator.java │ ├── CalculatorEngine.java │ └── CalculatorUI.java ├── README.md └── build.bat (Windows) / build.sh (Linux/Mac) 💻 Complete Source Code 1. ScientificCalculator.java (Main Class) import javax.swing.*; import javax.swing.border.*; import java.awt.*; import java.awt.event.*; import java.math.BigDecimal; import java.math.RoundingMode; public class ScientificCalculator extends JFrame private JTextField displayField; private JPanel buttonPanel; private CalculatorEngine engine; private boolean isDegree = true; // true = DEG, false = RAD // Inner class for expression evaluation using Shunting-yard

public String calculate(String expression, boolean isDegree) try catch (Exception e) return "Error";

private double evaluateExpression(String expression) return new ExpressionEvaluator().evaluate(expression);

@echo off echo Compiling Scientific Calculator... javac -d bin src/*.java if %errorlevel%==0 ( echo Compilation successful! echo Running Calculator... java -cp bin ScientificCalculator ) else ( echo Compilation failed! ) pause ScientificCalculator

public void setAngleMode(boolean degree) this.degreeMode = degree;

public String calculateUnary(String operation, String value, boolean isDegree) try double num = Double.parseDouble(value); double result = 0; switch (operation) case "sin": result = isDegree ? Math.sin(Math.toRadians(num)) : Math.sin(num); break; case "cos": result = isDegree ? Math.cos(Math.toRadians(num)) : Math.cos(num); break; case "tan": result = isDegree ? Math.tan(Math.toRadians(num)) : Math.tan(num); break; case "asin": result = isDegree ? Math.toDegrees(Math.asin(num)) : Math.asin(num); break; case "acos": result = isDegree ? Math.toDegrees(Math.acos(num)) : Math.acos(num); break; case "atan": result = isDegree ? Math.toDegrees(Math.atan(num)) : Math.atan(num); break; case "sinh": result = Math.sinh(num); break; case "cosh": result = Math.cosh(num); break; case "tanh": result = Math.tanh(num); break; case "log": result = Math.log10(num); break; case "ln": result = Math.log(num); break; case "√": result = Math.sqrt(num); break; case "∛": result = Math.cbrt(num); break; case "x²": result = num * num; break; case "x³": result = num * num * num; break; case "1/x": result = 1 / num; break; case " return String.valueOf(result); catch (Exception e) return "Error";

private void initializeUI() setLayout(new BorderLayout(10, 10)); // Display Panel JPanel displayPanel = new JPanel(new BorderLayout()); displayField = new JTextField("0"); displayField.setFont(new Font("Monospaced", Font.BOLD, 28)); displayField.setHorizontalAlignment(JTextField.RIGHT); displayField.setEditable(false); displayField.setBackground(Color.WHITE); displayField.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createLineBorder(Color.GRAY), BorderFactory.createEmptyBorder(10, 10, 10, 10) )); displayPanel.add(displayField, BorderLayout.CENTER); // Mode Panel JPanel modePanel = new JPanel(new FlowLayout(FlowLayout.LEFT)); JRadioButton degRadio = new JRadioButton("DEG", true); JRadioButton radRadio = new JRadioButton("RAD", false); ButtonGroup modeGroup = new ButtonGroup(); modeGroup.add(degRadio); modeGroup.add(radRadio); degRadio.addActionListener(e -> isDegree = true; engine.setAngleMode(true); ); radRadio.addActionListener(e -> isDegree = false; engine.setAngleMode(false); ); modePanel.add(degRadio); modePanel.add(radRadio); modePanel.add(Box.createHorizontalStrut(20)); JLabel statusLabel = new JLabel("Scientific Calculator v1.0"); statusLabel.setForeground(Color.GRAY); modePanel.add(statusLabel); displayPanel.add(modePanel, BorderLayout.NORTH); add(displayPanel, BorderLayout.NORTH); // Button Panel buttonPanel = new JPanel(new GridBagLayout()); buttonPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); addButtons(); add(buttonPanel, BorderLayout.CENTER); // Menu Bar JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); JMenuItem exitItem = new JMenuItem("Exit"); exitItem.addActionListener(e -> System.exit(0)); fileMenu.add(exitItem); JMenu editMenu = new JMenu("Edit"); JMenuItem copyItem = new JMenuItem("Copy"); copyItem.addActionListener(e -> StringSelection ss = new StringSelection(displayField.getText()); Toolkit.getDefaultToolkit().getSystemClipboard().setContents(ss, null); ); JMenuItem pasteItem = new JMenuItem("Paste"); pasteItem.addActionListener(e -> try String clipboard = (String) Toolkit.getDefaultToolkit() .getSystemClipboard().getData(java.awt.datatransfer.DataFlavor.stringFlavor); displayField.setText(clipboard); catch (Exception ex) // Ignore ); editMenu.add(copyItem); editMenu.add(pasteItem); JMenu helpMenu = new JMenu("Help"); JMenuItem aboutItem = new JMenuItem("About"); aboutItem.addActionListener(e -> JOptionPane.showMessageDialog(this, "Scientific Calculator v1.0\n\nSupports:\n" + "- Basic arithmetic\n" + "- Trigonometric functions (sin, cos, tan)\n" + "- Inverse trig functions (asin, acos, atan)\n" + "- Logarithmic functions (log, ln)\n" + "- Power and root functions\n" + "- Factorial, percentage\n" + "- Constants (π, e)", "About", JOptionPane.INFORMATION_MESSAGE); ); helpMenu.add(aboutItem); menuBar.add(fileMenu); menuBar.add(editMenu); menuBar.add(helpMenu); setJMenuBar(menuBar);

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", "∛", ", "floor", "ceil", "!", "%", "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