Static Members Interview Questions Mock Test

Question 1: C++ OOPS Static Data Member

Which statement is true about static data members in C++?

Question 2: C++ OOPS Static Member Function

Which of the following is true about static member functions?

Question 3: C++ OOPS Static Variable in Class

What will be the output?

#include <iostream>
using namespace std;
class Test {
    static int count;
public:
    Test() { count++; }
    static int getCount() { return count; }
};
int Test::count = 0;
int main() {
    Test a, b, c;
    cout << Test::getCount();
}

Question 4: C++ OOPS Static Member Initialization

Where must static data members of a class be defined?

Question 5: C++ OOPS Static Member Function Call

How can a static member function be called?

Question 6: C++ OOPS Static Member and Object Lifetime

What happens to static members when all objects of the class are destroyed?

Question 7: C++ OOPS Static Function Limitation

Which of the following is NOT allowed in static member functions?

Question 8: C++ OOPS Static Variable Behavior

What will be the output?

#include <iostream>
using namespace std;
class Demo {
    static int x;
public:
    Demo() { x++; }
    ~Demo() { x--; }
    static int getX() { return x; }
};
int Demo::x = 0;
int main() {
    Demo d1, d2;
    cout << Demo::getX();
}

Question 9: C++ OOPS Static Member Access

Which of the following is the correct way to access a static variable of a class `Sample` named `count`?

Question 10: C++ OOPS Static vs Non-Static Member

What will be the output?

#include <iostream>
using namespace std;
class Alpha {
    static int x;
    int y;
public:
    Alpha() { y = 5; }
    static void printX() { cout << x; }
    void printY() { cout << y; }
};
int Alpha::x = 100;
int main() {
    Alpha::printX();
    Alpha a;
    a.printY();
}