C++ miscellaneous
practice.

How many parameters are required for next_permutation?

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

#include <cstdlib>
#include <iostream>
using namespace std;
class X 
{
    public:
    void* operator new(size_t sz) throw (const char*)
    {
        void* p = malloc(sz);
        if (p == 0) 
            throw "malloc() failed";
        return p;
    }
   void operator delete(void* p) 
        {
        cout << "X :: operator delete(void*)" << endl;
        free(p);
    } 
};
class Y 
{
    int filler[100];
    public:
    void operator delete(void* p, size_t sz) throw (const char*)
    {
        cout << "Freeing " << sz << " bytes" << endl;
        free(p);
    };
};
int main() 
{
    X* ptr = new X;
    delete ptr;
    Y* yptr = new Y;
    delete yptr;
}

Which is the correct syntax of capturing a variable 'X' by reference and other variable 'Y' by value in lambda expression?

Which of the following is correct about tuple_size?

Which of the following keyword is used to declare the header file?

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

#include <iostream> 
#include <vector> 
 
using namespace std; 
 
int main() 
{ 
    vector<int> v; 
    for (int i = 1; i <= 5; i++) 
        v.push_back(i); 
    cout<<v.size()<<endl;
    v.resize(4);
    cout<<v.size()<<endl;
    return 0; 
}

Which header file is required for using bitset in your program?

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

#include <iostream>
#include <string>
#include <tuple>
using namespace std;
int main()
{
	tuple <int, char, string> tp = {"Hello", 1, 's'};
	return 0;
}

Which of the following is/are advantage(s) of Sequence Container arrays over C-like arrays?

Pick out the correct statement.

What type of comments does c++ support?

What do vectors represent?

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

#include <iostream>
#include <algorithm>
#include <vector>
#include <functional>
using namespace std;
int op_increase (int i)
{
    return ++i;
}
int main ()
{
    vector<int> a;
    vector<int> b;
    for (int i = 1; i < 4; i++)
    a.push_back (i * 10);
    b.resize(a.size());
    transform (a.begin(), a.end(), b.begin(), op_increase);
    transform (a.begin(), a.end(), b.begin(), a.begin(), plus<int>());
    for (vector<int> :: iterator it = a.begin(); it != a.end(); ++it)
        cout << ' ' << *it;
    return 0;
}

Which function is used to get the absolute of a complex number?

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

#include <iostream>
using namespace std;
struct A 
{
    virtual void f()  
    { 
        cout << "Class A" << endl; 
    }
};
struct B : A 
{
    virtual void f() 
    { 
        cout << "Class B" << endl;
    }
};
struct C : A 
{
    virtual void f() 
    {
        cout << "Class C" << endl; 
    }
};
void f(A* arg) 
{
    B* bp = dynamic_cast<B*>(arg);
    C* cp = dynamic_cast<C*>(arg);
    if (bp)
        bp -> f();
    else if (cp)
        cp -> f();
    else
        arg -> f();  
};
int main() 
{
    A aobj;
    C cobj;
    A* ap = &cobj;
    A* ap2 = &aobj;
    f(ap);
    f(ap2);
}

Which type of relationship is modelled by Aggregation?

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

#include <iostream>
using namespace std;
class Base
{
    public:
    int m;
    Base(int n=0)
    : m(n)
    {
        cout << "Base" << endl;
    }
};
class Derived: public Base
{
    public:
    double d;
    Derived(double de = 0.0)
    : d(de)
    {
        cout << "Derived" << endl;
    }
};
int main()
{
    cout << "Instantiating Base" << endl;
    Base cBase;
    cout << "Instantiating Derived" << endl;
    Derived cDerived;
    return 0;
}

Which operator is used to produce a certain number in a specific range?

What is the use of is_heap_until() function?

Which of the following is correct about bitset and vector of bools?