What is the difference between a class and a struct

In C++, a comment can only be specified with a leading //.

std::vector<int> v(4); std::fill(v.begin(), v.end(), 4); What is the content of vector v?

What will 'int a = 'a';' do?

Which of the following can cause a memory corruption error?

Consider this code fragment: a = 25; b = &a; What does b equal?

Which STL class is the best fit for implementing a phonebook? Suppose each entry contains a name and a phone number, with no duplicates, and you want to have lookup by name.

What is the purpose of a destructor?

Consider a class named CustomData. Which choice is a correct declaration syntax to overload the postfix ++ operator as a class member?

What does this function do? auto buff = new char[50]; Std::memset(buff,20,50);

What is this expression equivalent to? A->B->C->D