Test: Class And Objects - 1 - Back-End Programming MCQ

The classes in c++ are used to manipulate both data and functions.

#include<iostream>
using namespace std;
  
class Empty {};
  
int main()
{
  cout << sizeof(Empty);
  return 0;
}
Output : 1

Size of an empty class is not zero. It is 1 byte generally. It is nonzero to ensure that the two different objects will have different addresses. 

There are two kinds of classes in c++. They are absolute class and concrete class.

Every object maintains a copy of non-static data members. For example, let Student be a class with data members as name, year, batch. Every object of student will have its own name, year and batch. On a side note, static data members are shared among objects.
All objects share codes of all methods. For example, every student object uses same logic to find out grades or any other method.

Struct and union take the same definition of class but differs in the access techniques.

The above program compiles & runs fine. Like variables it is possible to create 2 objects having same name & in different scope.

Virtual function is can’t be static in C++. So, option (B) is correct.

Header file can not be passed to a function in C++. While array, constant and structure can be passed into a function.
So, option (D) is correct.