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

#include <iostream>
#include <fstream>
using namespace std;
int main () 
{
    int length;
    char * buffer;
    ifstream is;
    is.open ("sample.txt", ios :: binary );
    is.seekg (0, ios :: end);
    length = is.tellg();
    is.seekg (0, ios :: beg);
    buffer = new char [length];
    is.read (buffer, length);
    is.close();
    cout.write (buffer, length);
    delete[] buffer;
    return 0;
}

#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;
}

#include <iostream>
using namespace std; 
int main()
{
    try
    {
        try
        {
            throw 20;
        }
        catch (int n)
        {
            cout << "Inner Catch\n";
            throw;
        }
    }
    catch (int x)
    {
        cout << "Outer Catch\n";
    }
    return 0;
}