C++ quiz with certificate: Test your skills and earn recognition for jobs

1. What is the output of the following C++ code?

string message = "Hello";
cout << message.length();

2. What is the output of the following C++ code?
int x = 5;
x++;
cout << x; What is the output of the following C++ code? C++ int x = 5; x++; cout << x;

3. What is the output of the following C++ code snippet that demonstrates perfect forwarding?

template
void func(T&& arg) {
std::cout << std::is_lvalue_reference::value << std::endl; } int main() { int x = 5; func(x); func(5); return 0; }

4. What is the difference between a while loop and a do-while loop in C++?

5. What is the output of the following C++ code snippet that uses smart pointers?

#include
#include
int main() {
std::shared_ptr p1 = std::make_shared(5);
std::weak_ptr p2 = p1;
p1.reset();
if (p2.expired()) {
std::cout << "Expired"; } else { std::cout << "Not expired"; } return 0; }

6. Which of the following is NOT a fundamental data type in C++?

7. What is the correct syntax for creating an array named "numbers" that can hold 5 integers in C++?

8. In C++, what is the purpose of the modulus operator (%)?

9. Which of the following is a type of memory leak in C++?

10. What does the virtual keyword signify in a C++ class member function?

11. Which of the following is a design pattern commonly used in C++ for creating objects?

12. Which of the following statements is true about lvalue and rvalue references in C++?

13. What is a reference variable in C++?

14. What is the purpose of the volatile keyword in C++?

15. Which of the following is the correct way to include the input/output library in C++?

16. Which of the following is NOT a valid C++ access specifier for class members?

17. Which of the following is the correct way to declare a function named calculateSum that takes two integers as arguments and returns an integer?

18. Which of the following is used to handle exceptions in C++?

19. Which of the following is an advantage of using std::unique_ptr over raw pointers in C++?

20. What is the purpose of the mutable keyword in C++?