The following pseudocode is an example of which type of validation check?

Question

BlackTom AI · Accepted Answer

Checking whether a field has been left empty (i.e., is equal to the empty string "") is a presence check.

1. Relevant knowledge points and concepts
- Presence check: verifies that a required field has been provided (not blank). Typical test: value <> "" (or not null).
- Format check: verifies that the value follows a specific pattern (e.g., email has @ and domain).
- Data type check: verifies that the value is of the expected type (e.g., integer, date).
- Range check: verifies a numeric (or date) value lies within allowed bounds (e.g., 1–100).

2. Step‑by‑step reasoning through the pseudocode
- The code prompts: Input Country.
- It then evaluates If Country = "" Then Print 'Please enter Country' End If.
- The condition explicitly tests whether the Country variable is equal to the empty string.
- If it is empty, the program requests the user to enter a country. That behavior enforces that the field cannot be left blank.

3. Calculations / intermediate steps
- No numerical calculations are required. The logical comparison Country = "" is the single check performed.

4. Why the correct answer is correct
- Because the code only tests for absence of any value (empty string) and prompts the user to supply one, this is exactly the definition of a presence check: ensuring required data is present.

5. Why the other options are incorrect
- Format check (b): would test a pattern (e.g., letters only, or "Country, CountryCode") — the code does not check any pattern.
- Data type check (c): would check type (e.g., is numeric or date) — the code only checks emptiness, not type.
- Range check (d): would check a numeric/date value lies within limits — not applicable here because no numeric bounds are tested.

6. Conclusion
- The pseudocode implements a presence check, matching option a.

The following pseudocode is an example of which type of validation check?单项选择题

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