C++ Programming Mock Test 9

1. What will be the output of the following C++ code?

 
    #include <iostream> 
    #include <algorithm>
    #include <vector>
    using namespace std;
    int main ()
    {
        int first[] = {5, 10, 15, 20, 25};
        int second[] = {50, 40, 30, 20, 10};
        vector<int> v(10);
        vector<int> :: iterator it;
        sort (first, first + 5);
        sort (second, second + 5);
        it = set_union (first, first + 5, second, second + 5, v.begin());  
        v.resize(it-v.begin());
        for (it = v.begin(); it != v.end(); ++it)
            cout << ' ' << *it;
        cout << '\n';
        return 0;
    }

2. What are binary functors?

3. Which of the header file is used to implement algorithms provided by C++ STL?

4. Which operator is used to compare the elements in heap?

5. What will be the output of the following C++ code?

 
    #include <iostream>
    #include <algorithm>
    #include <vector>
    using namespace std;
    int main () 
    {
        vector<int> myvector;
        for (int i = 1; i < 6; ++i) 
            myvector.push_back(i);
        reverse(myvector.begin(), myvector.end());
        for (vector<int> :: iterator it = myvector.begin(); it != myvector.end(); ++it)
            cout << ' ' << *it;
        return 0;
    }

6. Which of the following is correct about the map and unordered map?

7. What will be the output of the following C++ code?

    #include <iostream>
    #include <algorithm>
    #include <vector>
    using namespace std;
    int main () 
    {
        int myints[] = {10, 20, 30, 5, 15};
        vector<int> v(myints, myints + 5);
        make_heap (v.begin(), v.end());
        pop_heap (v.begin(), v.end()); v.pop_back();
        v.push_back(99); push_heap (v.begin(), v.end());
        sort_heap (v.begin(), v.end());
        for (unsigned i = 0; i < v.size(); i++)
            cout << ' ' << v[i];
        return 0;
    }

8. Which of the following is correct about Functors?

9. What does the checked iterator allow you to find?

10. What are the two advantage of function objects than the function call?