MCQ on C++ (Part-2): Solve These MCQs and Boost Your Knowledge

Question 1: Which of the following is a correct way to declare and define a function in C++?

Question 2: What is the output of the following code snippet?

int x = 10;
int y = 5;
x += y++;
std::cout << x << std::endl;

Question 3: What is the purpose of the "break" statement in a switch statement?

Question 4: What is the purpose of the "new" operator in C++?

Question 5: Which of the following is NOT a valid storage class specifier in C++?

Question 6: Which of the following is true about the "friend" keyword in C++?

Question 7: What is the purpose of the "this" pointer in C++?

Question 8: What is the purpose of the "virtual" keyword in C++?

Question 9: Which of the following is true about C++ templates?

Question 10: What is the output of the following code snippet?

int x = 5;
int* p = &x;
std::cout << *p << std::endl;

Question 11: Which of the following is true about function overloading in C++?

Question 12: What is the output of the following code snippet?

int arr[] = {1, 2, 3, 4, 5};
int* ptr = arr;
std::cout << *ptr << std::endl;

Question 13: Which operator is used to access the member functions and variables of objects in C++?

Question 14: What is the purpose of the "const" keyword in C++?

Question 15: Which of the following is a valid way to pass arguments to a C++ function?

Question 16: What is the output of the following code snippet?

int x = 5;
int& ref = x;
ref = 10;
std::cout << x << std::endl;

Question 17: Which keyword is used to explicitly convert one data type to another in C++?

Question 18: Which of the following is true about static member variables in C++?

Question 19: Which of the following statements is true about the "new" operator in C++?

Question 20: What is the purpose of the "virtual" keyword in C++?

Question 21: What is the purpose of the "this" pointer in C++?

Question 22: What is the output of the following code snippet?

int arr[] = {1, 2, 3, 4, 5};
int* ptr = arr + 2;
std::cout << *ptr << std::endl;

Question 23: What is the purpose of the "inline" keyword in C++?

Question 24: What is the difference between "delete" and "delete[]" operators in C++?

Question 25: What is the output of the following code snippet?

class Base {
public:
    Base() { std::cout << "Base constructor" << std::endl; }
    virtual ~Base() { std::cout << "Base destructor" << std::endl; }
};

class Derived : public Base {
public:
    Derived() { std::cout << "Derived constructor" << std::endl; }
    ~Derived() { std::cout << "Derived destructor" << std::endl; }
};

int main() {
    Base* ptr = new Derived();
    delete ptr;
    return 0;
}

Question 26: Which keyword is used to indicate that a class cannot be inherited from?

Question 27: What does the "const" qualifier indicate in C++?

Question 28: What is the purpose of the "new" operator in C++?

Question 29: What is the purpose of the "friend" keyword in C++?

Question 30: What is the purpose of the "using" directive in C++?