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

#include <iostream>
using namespace std;
class Base
{
    public:
    virtual void print() const = 0;
};
class DerivedOne : virtual public Base
{
    public:
    void print() const
    {
        cout << "1";
    }
};
class DerivedTwo : virtual public Base
{
    public:
    void print() const
    {
        cout << "2";
    }
};
class Multiple : public DerivedOne, DerivedTwo
{
    public:
    void print() const
    {
        DerivedTwo::print();
    }
};
int main()
{
    Multiple both;
    DerivedOne one;
    DerivedTwo two;
    Base *array[ 3 ];
    array[ 0 ] = &both;
    array[ 1 ] = &one;
    array[ 2 ] = &two;
    for ( int i = 0; i < 3; i++ )
    array[ i ] -> print();
    return 0;
}

#include <stdio.h>
int main ()
{
    int result;
    char oldname[] = "myfile2.txt";
    char newname[] = "newname.txt";
    result = rename(oldname, newname );
    if (result == 0)
        puts ( "success" );
    else
        perror( "Error" );
    return 0;
}