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count.md

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count

Description : : Returns the number of elements in the range [first, last) satisfying specific criteria(counts the elements that are equal to value).

Example :

    std::vector<int> v{ 1, 2, 3, 4, 4, 3, 7, 8, 9, 10 };

    // determine how many integers in a std::vector match a target value.
    int target1 = 3;
    int num_items1 = std::count(v.begin(), v.end(), target1);
    std::cout << "number: " << target1 << " count: " << num_items1 << '\n';

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