C language Structure (.) Operator or sizeof() - Structures are one of the two important building blocks in the understanding of classes and objects. A structure is a collection of data while a class is a collection of data and functions. In other words, we can say, a structure plus related functions make a class. Technically, there is no difference between a structure and a class. The keyword struct tells the compiler that a structure is begin defined.
It's a special area where you can find special questions and answers for CSE students or IT professionals. Also, In this section, we try to explain a topic in a very deep way.