How to evaluate a scientific-style expression

1. Type the expression

   "Expression" accepts numbers, the four arithmetic operators, `^` for exponentiation, and parentheses for grouping. Length is capped at 500 characters.

2. Note the unary-minus quirk

   Unary minus is NOT supported as a prefix — type `-5` and you'll get a parse error. Use `(0-5)` instead. The same goes for `(0-x)` inside larger expressions.

3. Press Run

   Result is a single `result` field with the evaluated number. Standard precedence applies: parentheses first, then `^` (right-associative), then `*` and `/` (left-associative), finally `+` and `-`.

4. No constants or trig

   There's no π, e, sin/cos/log, or factorial — keep your expression to plain arithmetic. For scientific functions, use a desktop or graphing calculator.