CLI calculator added (add/sub/mul/div)

[opencode-agent]

Implemented a minimal CLI calculator and added it to the repository.

What I added

• calculator.py at the repository root
  • Supports operations: add, subtract, multiply, divide
  • CLI usage: python calculator.py
  • Arguments are parsed as numbers (float for flexibility)
  • Output formatting: prints integer results as integers (e.g., 5) and floats as decimals
  • Basic error handling:
    • Unknown operation -> prints error message
    • Division by zero -> prints error message and exits with code 1
    • Invalid number input -> prints error message and exits with code 2

Usage examples

• python calculator.py add 2 3
  • Output: 5
• python calculator.py subtract 5 2
  • Output: 3
• python calculator.py multiply 2.5 4
  • Output: 10
• python calculator.py divide 10 2
  • Output: 5
• python calculator.py divide 5 0
  • Output: division by zero
• python calculator.py unknown 1 2
  • Output: Unknown operation: unknown

Notes

• The script is robust to integer and floating inputs and prints clean output (integers without trailing .0).
• If you want to extend with more operations (e.g., power, modulo), I can add them with similar CLI ergonomics.

If you’d like, I can run a PR-ready commit or adjust for any additional behaviors you prefer.

Closes #685

opencode session  |  github run