Cpp : Static Member 6

C++ Programming Questions and Answers – Static Members

This set of C++ Programming Multiple Choice Questions & Answers (MCQs) focuses on “Static Members”.

1.
What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class Test
{
    static int x;
  public:
    Test() 
	{ 
		x++; 
	}
    static int getX() 
	{
		return x;
	}
};
int Test::x = 0;
int main()
{
    cout << Test::getX() << " ";
    Test t[5];
    cout << Test::getX();
}

a) 0 0
b) 5 0
c) 0 5
d) 5 5

2.
What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class Player
{
  private:
    int id;
    static int next_id;
  public:
    int getID() { return id; }
    Player()  {  id = next_id++; }
};
int Player::next_id = 1;
int main()
{
  Player p1;
  Player p2;
  Player p3;
  cout << p1.getID() << " ";
  cout << p2.getID() << " ";
  cout << p3.getID();
  return 0;
}

a) 1 2 3
b) 2 2 2
c) 1 3 1
d) 1 1 1

3.
Which of the following is correct about static variables?

a) Static functions do not support polymorphism
b) Static data members cannot be accessed by non-static member functions
c) Static data members functions can access only static data members
d) Static data members functions can access both static and non-static data members

4.
What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class A
{
   private:
     int x;
   public:
     A(int _x)  {  x = _x; }
     int get()  { return x; }
};
class B
{
    static A a;
  public:
   static int get()
   {  return a.get(); }
}; 
int main(void)
{
    B b;
    cout << b.get();
    return 0;
}

a) Garbage value
b) Compile-time Error
c) Run-time Error
d) Nothing is printed

5.
What will be the output of the following C++ code?

#include<iostream>
using namespace std;
class Test
{
   private:
     static int count;
   public:
     void fun(); 
};
int Test::count;
void Test::fun()
{
    count++;
    cout << count << " ";
}
int main()
{
    Test t;
    t.fun();
    return 0;
}

a) 0
b) Cannot Say
c) 1
d) Error