ITPEC FE Subject B October 2025 Question 15

Calculating IDF by counting documents containing a given term

The function calcIDF computes IDF for a term across a corpus of documents. Each document is split into words, then each word is compared to term.

• •Blank A is inside the inner loop iterating over words (the split result of corpus[i]), so the comparison must be words[j] = term
• •Blank B checks after the inner loop whether the term was found in that document — since isContainsTerm is set to true when found, the condition must be isContainsTerm = true

Why not others:
- corpus[j] = term (options a–d) — corpus[j] is an entire document string, not an individual word; the inner loop index j iterates over words, not corpus
- isContainsTerm = false in B (options e, g) — termCount should increment when the term was found, not when it was absent
- words[j] ≠ term with true (option h) — would set the flag on mismatch, counting documents that do NOT contain the term

Key rule: When a loop splits a string into parts and iterates over them, the comparison target is the split array (words[j]), not the original collection (corpus[j]).

AI-generated — may contain errors