All variables use data-type during declaration to restrict the type of data to be stored. Therefore, we can say that data types are used to tell the variables the type of data it can store. Whenever a variable is defined in C++, the compiler allocates some memory for that variable based on the data type with which it is declared. Every data type requires a different amount of memory.

C++ supports a wide variety of data types and the programmer can select the data type appropriate to the needs of the application. Data types specify the size and types of value to be stored. However, storage representation and machine instructions to manipulate each data type differ from machine to machine, although C++ instructions are identical on all machines.

C++ supports the following data types:

C++ is a programming language that is widely used in developing software applications. Like any programming language, C++ has various data types that define the type of data a variable can hold. The data types in C++ are classified into four categories: fundamental, enumeration, derived, and user-defined.

Fundamental data types are the basic data types provided by the language, and they include bool, char, int, float, double, and void. These data types are used to store values like true/false, characters, integers, real numbers, and nothing respectively.

Enumeration data types are used to define a set of named constants. They are defined using the enum keyword and are used to make code more readable and understandable.

Derived data types are created from fundamental data types. They include arrays, pointers, and references.

User-defined data types are created by the programmer. They include structures, classes, and unions. Structures are collections of variables of different data types, while classes are a type of structure with methods and functions. Unions are similar to structures but allow different variables to share the same memory space.

In conclusion, understanding C++ data types is important for programming in C++. By using the appropriate data type, programmers can create efficient and effective code that can handle the different data types required by the software.