C++ Programming.

The C++ language: references, classes, virtual dispatch, lambdas and casts. Covers 16 topics.

• C++ Programming · 1 of 3

  Range-based for & Initialization

  In C++, what value does int z{}; give z?

  Ait has no valueBit is set to 0Cit is set to 1Dit is left unset

• C++ Programming · 2 of 3

  Lambdas & Captures

  A closure that captured a local by reference is returned and then called. What does this program do?

  #include <iostream>#include <functional>std::function<int()> make() { int local = 7; return [&local]() { return local; }; }int main() {  auto f = make();  std::cout << f();}

  Ait reads a zero valueBit reads dead storageCit reads a fresh localDit reads a safe copy

• C++ Programming · 3 of 3

  Inheritance & Virtual Functions

  A developer copies a Circle into a cache slot of type Shape, a polymorphic class that Circle inherits from, then calls dynamic_cast<Circle*> on the slot's address. The cast always yields nullptr. Why?

  AThe copy dropped the vtable pointer, so RTTI is unavailableBdynamic_cast needs a reference type here, not a pointerCCopying it in sliced off everything the subclass addedDThe cache slot holds a null pointer, not the copied object