48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
# Scientific Calculator
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An interactive **command-line** scientific calculator written in Python. It presents a numbered menu, reads your inputs, and prints results for each operation. The core math lives in small functions in `calculator.py`, so you can also import them from another script if you want to reuse the same behavior.
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## What it does
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- Runs a **REPL-style loop**: choose an operation, enter operands, see `Result: …`, repeat until you exit.
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- Uses only the **Python standard library** (`math`); no extra packages to install.
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- **Validates** some edge cases: division by zero and logarithms of non-positive numbers raise clear errors instead of failing silently.
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## Operations
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| Choice | Operation | Inputs | Notes |
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|--------|-----------|--------|--------|
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| 1 | Add | `x`, `y` | |
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| 2 | Subtract | `x`, `y` | |
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| 3 | Multiply | `x`, `y` | |
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| 4 | Divide | `x`, `y` | Error if `y` is zero |
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| 5 | Sine | `x` | `x` is in **radians** |
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| 6 | Cosine | `x` | **radians** |
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| 7 | Tangent | `x` | **radians** |
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| 8 | Logarithm | `x`, optional base | `x` must be **> 0**; base defaults to **e** if you press Enter |
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| 9 | Exponent | `x`, `y` | `x` to the power `y` (`math.pow`) |
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| 0 | Exit | — | Ends the program |
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Invalid menu choices print `Invalid choice.` Other problems (bad numeric input, domain errors) print `Error: …` with the exception message.
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## Requirements
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- Python 3 (any recent 3.x is fine)
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## Usage
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From the project directory:
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```bash
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python calculator.py
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```
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Follow the on-screen prompts. For logarithms, leave the base blank to use the natural logarithm (base **e**).
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## Project layout
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- **`calculator.py`** — Menu-driven `main()` plus the operation functions (`add`, `subtract`, `multiply`, `divide`, `sine`, `cosine`, `tangent`, `logarithm`, `exponent`).
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## Disclaimer
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For learning purposes.
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