The expression std::multimap::value_type(15, 2.7): A) Creates an empty multimap object. B) Creates a multimap object containing one key/value pair. C) Returns the number of times the key/value pair (15, 2.7) appears in the multimap. D) Creates a pair object in which first is 15 (type int) and second is 2.7 (type double).

Question

The expression std::multimap>::value_type(15, 2.7): A) Creates an empty multimap object. B) Creates a multimap object containing one key/value pair. C) Returns the number of times the key/value pair (15, 2.7) appears in the multimap. D) Creates a pair object in which first is 15 (type int) and second is 2.7 (type double).

Quizplus · Accepted Answer

The expression creates a pair object with the key value 15 and mapped value 2.7 in the multimap, with the pair object being of type std::pair<const int, double> and therefore the value_type of the multimap. Option A is incorrect as the expression creates a non-empty multimap object, option B is incorrect as it only creates one key/value pair, not a full multimap object, and option C is incorrect as the expression does not return the number of times the key/value pair appears in the multimap, but instead creates a single pair object.

The Expression Std::multimap<int, Double, Std::less<int>>::value_type(15, 2.7)