Quiz: Memory and Smart Pointers

5 questionsNo time limitPass: 60%+10 XP on first pass

Manage memory the modern way: new and delete, RAII, unique_ptr and shared_ptr, the rule of three/five, copy vs move, and exception handling with try, catch and throw.

Free account · see your score, answers and explanations, earn XP

Question 1
Which smart pointer should be your default choice?
unique_ptrshared_ptrweak_ptrauto_ptr
Question 2
What happens when you try to copy a unique_ptr?
Both point to the objectCompile error — it can only be movedThe object is copiedIt becomes a shared_ptr
Question 3
Which correctly frees memory from new int[50]?
delete p;delete[] p;free(p);p = nullptr;
Question 4
What does RAII guarantee?
Faster codeResources are released automatically when the owning object is destroyedNo exceptions are thrownObjects are never copied

Question 5

What does this print?

#include <iostream>
#include <memory>
using namespace std;
int main() {
    auto a = make_shared<int>(5);
    auto b = a;
    auto c = b;
    cout << a.use_count();
    return 0;
}

1235