ITPEC FE Morning April 2021 Question 23
ITPEC FE Morning April 2021 — Question 23 of 80
Check Digit — detects errors in the value of an entered code.
A check digit is an extra digit calculated from the other digits using an algorithm (e.g., ISBN, credit card numbers). It catches transcription and transposition errors.
Why not others:
- (a) Detecting alphabets/symbols in a numeric field → numeric check (data type validation)
- (b) Detecting incorrect number of digits → digit count check / length check
- (d) Detecting value outside a range → range check
Key rule: Check digit validates the correctness of the code value itself, not its format, length, or range.
AI-generated — may contain errors
The original exam layout is preserved in the image so diagrams, formulas, tables, and code remain accurate.
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