C++ miscellaneous MCQ question and answer with solution | C++ Programimg MCQs

#include <iostream>
#include <memory>
#include <string>
using namespace std;
int main ()
{
    string numbers[] = {"steve", "jobs"};
    pair <string*, ptrdiff_t> result = get_temporary_buffer<string>(2);
    if (result.second>0) 
    {
        uninitialized_copy ( numbers, numbers + result.second, result.first );
        for (int i = 0; i < result.second; i++)
            cout << result.first[i] << " ";
       return_temporary_buffer(result.first);
    }
    return 0;
}

#include <string>
#include <iostream>
using namespace std;
void string_permutation( string& orig, string& perm )
{
    if (orig.empty())
    {
        cout<<perm<<endl;
        return;
    }
    for (int i = 0; i < orig.size(); ++i)
    {
        string orig2 = orig;
        orig2.erase(i, 1);
        string perm2 = perm;
        perm2 += orig.at(i);
        string_permutation(orig2, perm2);
    }
}
int main()
{
    string orig = "ter";
    string perm;
    string_permutation(orig, perm);
    return 0;
}

#include <iostream>
#include <vector>
using namespace std;
int main ()
{
    vector<int> first;
    first.assign (7,100);
    vector<int>::iterator it;
    it=first.begin()+1;
    int myints[] = {1776,7,4};
    cout << int (first.size()) << '\n';
    return 0;
}