How to Use the Hewlett-Packard Watch Calculator

The calculator features a sleek retro interface mimicking an HP calculator watch, complete with green digital-style text and tactile-style buttons.

Step-by-Step Instructions:

1. Enter Numbers
   Tap the digit buttons (0-9) to input your desired number.
2. Choose an Operator
   Select from the four basic arithmetic operations:
   • + (Addition)
   • - (Subtraction)
   • x (Multiplication)
   • ÷ (Division)
3. Use Decimal Points
   Tap . to input decimal numbers.
4. Calculate Result
   Press = to evaluate the expression. The result will appear on the screen.
5. Clear the Screen
   Press C to reset and start a new calculation.

---

Example Calculation

If you input:

CopyEdit7 + 8 x 2

Then tap =, the calculator will correctly follow operator precedence (multiplication before addition) and display:

CopyEdit23

---

FAQ: Hewlett-Packard Watch Calculator

Q1: Is this a real HP product?

No, this is a digital recreation inspired by the classic Hewlett-Packard calculator watches.

Q2: Does it simulate Reverse Polish Notation (RPN)?

This version uses standard algebraic notation, not RPN. However, an RPN mode can be added.

Q3: Can I use it offline?

Yes, this calculator runs entirely in your browser and works offline once loaded.

Q4: Does it store my data?

No, all calculations are done locally in your browser, and nothing is saved or sent anywhere.