1. Standard Calculation: Supports addition, subtraction, multiplication, division, percentages, and decimals. Use keyboard or click buttons.
2. Scientific Calculation: Supports sin/cos/tan, log/ln, square/cube, power operations, and π/e constants.
3. Financial Calculation: Loan payment calculation and investment compound interest calculation.
4. Keyboard Support: Number keys, operators, Enter to calculate, Backspace to delete, Esc to clear.
5. Save History: Saves up to 20 records: Automatically keeps the latest 20 records; older ones are deleted automatically. Manual Clear: Click the "Clear History" button to manually delete all records.
Single Delete: Each record has a delete button next to it.
Quick Use: Click the 📋 button next to a record to paste the result directly into the calculator. Timestamp: Each record displays the calculation time.
Force Refresh Clear: Data is only deleted by manually clearing browser cache or force refreshing (Ctrl+F5);

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