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

#include <iostream>
#include <Valarray>
using namespace std;
int main()
{
	Valarray<int> varr = { 1, 2, 3, 4, 5 };
	for (int &x: varr) cout << x << " ";
	cout<<endl;
	varr = varr.shift(2);
	for (int &x: varr) cout << x << " ";
	return 0;
}

#include <iostream> 
#include <vector> 
#include <forward_list>  
 
using namespace std; 
 
int main() 
{ 
    forward_list<int> fl1 = {1,2,3,4,5};
    for (int&c : fl1)  
        cout << c << " ";
    cout<<endl;
    fl1.remove_if([](int x){ return x > 3;});
    for (int&c : fl1)  
        cout << c << " ";
    cout<<endl;
    return 0; 
}

#include <iostream>
#include <valarray>
using namespace std;
int main()
{
	valarray<int> varr = { 10, 2, 20, 1, 30 };
	cout<<"Sum of array: "<<varr.sum();
	return 0;
}

#include <iostream>
using namespace std;
class Base
{
    public:
    Base ( )
    {
        cout << "1" << endl;
    }
    ~Base ( )
    {
        cout << "2" << endl;
    }
};
class Derived : public Base
{
    public:
    Derived  ( )
    {
        cout << "3" << endl;
    }
    ~Derived ( )
    {
        cout << "4" << endl;
    }    
}; 
int main( )
{
    Derived x;
}

#include <iostream>
#include <bitset>
using namespace std;
int main()
{
	bitset<8> b1(95);
	bitset<8> b2 = b1 << 3;
	cout<<b2;
}

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () 
{
    vector<int> myvector;
    for (int i = 1; i < 5; ++i)
        myvector.push_back(i);
    rotate(myvector.begin(), myvector.begin() + 3, myvector.end( ));
    for (vector<int> :: iterator it = myvector.begin(); 
        it != myvector.end(); ++it)
    cout << ' ' << *it;
    return 0;
}