C++ Variables and Data Types

What will be the output of the following code?

#include<iostream>
using namespace std;
int main ()
{
int cin;
cin >> cin;
cout << "cin" << cin;
return 0;
}

#include <iostream>
using namespace std;
int main()
{
float f = 3.5;


int b = static_cast<int>(f);


cout << b;
}

Which of the following types is the language C++?

#include<iostream>
using namespace std;


class Test
{
private:
static int count;
public:
Test& fun();
};


int Test::count = 0;


Test& Test::fun()
{
Test::count++;
cout << Test::count << " ";
return *this;
}


int main()
{
Test t;
t.fun().fun().fun().fun();
return 0;
}

Why do we use the “dynamic_cast” type conversion in c++?

#include<iostream>
using namespace std;
int x = 1;
void fun()
{
int x = 2;
{
int x = 3;
cout << ::x << endl;
}
}
int main()
{
fun();
return 0;
}

In C++, const qualifier can be applied to

1) Member functions of a class

2) Function arguments

3) To a class data member which is declared as static

4) Reference variables

Which of the following is true?

How are the constants declared?

Which of the following is not a correct variable in C++?