Question

which of the following is used to implement the c++ interfaces?

(a) absolute variables

(b) abstract classes

(c) constant variables

(d) default variables

The question was posed to me during an online exam.

This key question is from Modularization and Interfaces in chapter Functions, Namespaces & Exceptions in C++ of C++

Answer 1

Right option is (b) abstract classes

The best I can explain: Abstract classes in C++ are purposely defined for making base classes containing atleast one virtual function which can be overloaded on inheritance, which means single function name for different sub-classes, hence acts as an interface.