# BACKLOG — eval phase

## Build backlog

- [x] D1 — arithmetic: +, -, *, /, precedence, parens, unary minus
- [x] D2 — division: true division, EvalError on div-by-zero
- [x] D3 — result type: int for whole values, float otherwise
- [x] D4 — CLI: calc.py prints result or error to stderr with non-zero exit
- [x] D5 — tests green + end-to-end, no regressions