Free practice · single-choice · medium
Practice
Validate a workplace quantity
A policy allows whole-number quantities from 1 through 100. Which input is valid after stripping?
Trusted input boundary
Business logic receives only validated, typed values
- PresenceRequired value supplied
- FormatAllowed external form
- ConvertFocused typed conversion
- RangeAllowed business limits
- UsePass checked value to logic
- ReportReturn useful safe failures
Presence, type, format, conversion, and range checks belong at a narrow boundary with useful failures and no hidden fallback.