(Logic Engine) import java.math.BigDecimal; import java.math.RoundingMode; import java.util.Stack; public class CalculatorEngine private double memory; private boolean degreeMode = true;
private double evaluateExpression(String expression) return new ExpressionEvaluator().evaluate(expression);
# Save the code as ScientificCalculator.java javac ScientificCalculator.java CalculatorEngine.java java ScientificCalculator For any issues, check that all three Java files are in the same directory and compiled together. The calculator will open as a standalone window with full scientific functionality.
public ScientificCalculator() engine = new CalculatorEngine(); initializeUI(); setTitle("Scientific Calculator"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setResizable(false); pack(); setLocationRelativeTo(null); scientific calculator source code in java free download
public CalculatorEngine() this.memory = 0;
public String calculate(String expression, boolean isDegree) try Double.isInfinite(result)) return "Error"; // Round to 10 decimal places BigDecimal bd = new BigDecimal(result); bd = bd.setScale(10, RoundingMode.HALF_UP); // Remove trailing zeros String formatted = bd.toPlainString(); if (formatted.contains(".")) formatted = formatted.replaceAll("0*$", ""); formatted = formatted.replaceAll("\\.$", ""); return formatted; catch (Exception e) return "Error";
@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 (Logic Engine) import java
// 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++) char c = expr.charAt(i); if (Character.isDigit(c) while (!operators.isEmpty()) values.push(applyOperation(operators.pop(), values.pop(), values.pop())); return values.pop(); private boolean isOperator(char c) c == '%'; private boolean hasPrecedence(char op1, char op2) op1 == '/' 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 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) x
public void clearEntry() // Implementation for clear entry javac -d bin src/*
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
public static void main(String[] args) SwingUtilities.invokeLater(() -> try UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); catch (Exception e) e.printStackTrace(); new ScientificCalculator().setVisible(true); );