How do you structure a C++ program?

In C++, a program is divided into the following three sections:

Structure is a collection of variables of different data types under a single name . It is similar to a class in that, both holds a collecion of data of different data types. For example: You want to store some information about a person: his/her name, citizenship number and salary.

In C++, classes and structs are blueprints that are used to create the instance of a class . Structs are used for lightweight objects such as Rectangle, color, Point, etc. Unlike class, structs in C++ are value type than reference type.