C++ test
Created on 23rd February 2025
Grade level: Higher Educationth grade
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30 Questions
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Questions (30)
1. What is the output of the following code snippet: `std::cout << (5 + 2) * 3;`?
21
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2. Which of the following is a valid way to declare a pointer in C++?
int* ptr;
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3. What will happen if you attempt to dereference a null pointer?
It will cause a segmentation fault.
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4. In C++, what does the 'new' keyword do?
It allocates memory for a variable at runtime.
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5. Which of the following is a correct syntax for a class in C++?
class MyClass { int x; };
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6. What is a destructor in C++?
A function called when an object is destroyed.
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7. What is the purpose of the 'virtual' keyword in C++?
To allow dynamic binding of methods.
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8. What does the 'const' keyword signify when used in a function parameter?
The parameter cannot be modified.
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9. What is the output of the following code snippet: `std::vector<int> v = {1, 2, 3}; std::cout << v.size();`?
3
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10. Which of the following is the correct way to include a standard library in C++?
#include <iostream>
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11. What is the output of the following C++ code snippet: 'std::cout << (5 + 3) * 2;'?
16
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12. Which of the following correctly defines a class in C++?
class MyClass {}
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13. What is polymorphism in the context of C++ programming?
The ability to redefine methods in derived classes
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14. In C++, what does the 'const' keyword signify when used in a function parameter?
The parameter cannot be modified
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15. Which of the following statements about constructors in C++ is TRUE?
A class can have multiple constructors.
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16. What is the purpose of the 'virtual' keyword in C++?
To enable method overriding
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17. What is a reference variable in C++?
An alias for another variable
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18. Which of the following is NOT a feature of object-oriented programming in C++?
Compilation
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19. How do you allocate memory dynamically for an integer variable in C++?
int *ptr = new int;
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20. What will be the output of the following code: 'std::cout << (true + false);'?
1
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21. What is the output of the following C++ code? #include <iostream> using namespace std; int main() { int x = 5; cout << ++x; return 0; }
6
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22. Which of the following is a correct way to define a function in C++?
int functionName() {}
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23. What is the purpose of the 'virtual' keyword in C++?
To enable polymorphism in derived classes
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24. Which operator is used to access members of a class in C++?
.
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25. Consider the following code snippet. What does the 'delete' keyword do in C++? int* ptr = new int; delete ptr;
Frees the allocated memory for an integer
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26. Which of the following statements about constructors is true?
They can be overloaded
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27. In C++, what is the main purpose of the 'this' pointer?
To refer to the current object instance
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28. What is the result of attempting to access an uninitialized pointer in C++?
The pointer will point to a random memory location
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29. What is the purpose of the 'friend' keyword in C++?
To access private members of a class
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30. Which data structure is used to implement a stack in C++?
Both Array and Linked List
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