1.7 KiB
epic, story, title, status
| epic | story | title | status |
|---|---|---|---|
| 2 | 2.2 | SI Prefix Support | draft |
Epic 2 — Unit Conversion System
Goal: Support 200+ units across all major categories with SI prefix support.
Story 2.2: SI Prefix Support
As a CalcPad user,
I want SI prefixes (nano through tera) recognized on any applicable unit in both short and long form,
So that I can naturally write expressions like 5 km or 200 MB without needing separate unit entries for every prefixed variant.
Acceptance Criteria:
Given the expression 5 km in miles
When the engine evaluates it
Then it recognizes km as kilo + meter
And the result is approximately 3.10686 miles
Given the expression 200 MB in GB
When the engine evaluates it
Then it recognizes MB as mega + byte and GB as giga + byte
And the result is 0.2 GB
Given the expression 3 µs in ms
When the engine evaluates it
Then it recognizes µs as micro + second and ms as milli + second
And the result is 0.003 ms
Given the expression 5 kilometers in miles
When the engine evaluates it
Then it recognizes the long-form prefix kilo combined with meters
And the result matches the short-form 5 km in miles
Given SI prefixes from nano (10^-9) through tera (10^12) When each prefix is applied to a compatible base unit Then the conversion factor is correctly applied: nano=10^-9, micro=10^-6, milli=10^-3, centi=10^-2, kilo=10^3, mega=10^6, giga=10^9, tera=10^12
Given an SI prefix applied to a unit where it does not make sense (e.g., kilofahrenheit)
When the engine encounters it
Then it does not recognize the combination as a valid unit
And it returns an appropriate error or treats the input as text