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Learning/Knowledge checks/Week 5/Day 22/Check

Module checkpoint

Day 22 · Collections knowledge check

Answer every question from your current understanding. After submission, compare your reasoning with the explanation and revisit any weak concept.

6 QuestionsOne Answer eachImmediate ScoreDetailed Explanations

Read→Reason→Select→Review

Question 1 of 6How is a dynamic array resized while retaining existing elements?

Assign the array to nullCall push_back on the dynamic arrayUse new[new_size](old_array)

Question 2 of 6Why check queue size before pop_front()?

An empty queue has no valid element to removeQueue indices must start at onepop_front on an empty queue resizes it to one element

Question 3 of 6How do you check whether an associative-array key exists?

Use array.size(key)Use array.exists(key)Use array.find_first_index without a condition

Question 4 of 6How do packed structs differ from unpacked structs?

Packed structs form a contiguous bit representationPacked structs can only be used inside classesUnpacked structs cannot contain integer or enum members

Question 5 of 6When is a queue preferable to a dynamic array?

When elements need a fixed packed bit width for synthesisWhen the size must stay fixed after the first allocationWhen elements are often added or removed at either end

Question 6 of 6Why is an associative array useful for a sparse address model?

It stores entries in a contiguous fixed-size blockIt allocates entries only for keys that are usedIt requires every possible address to be allocated

Review every selection before submitting. You can retry after reading the explanations.

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