What is the purpose of a function in C plus plus?

Answer 1

The purpose of C++ is to produce machine code programs from a text-based source. While much of what you can do in C++ you can also do in C, the addition of object-oriented programming (OOP) in C++ makes it possible to model highly complex structures more easily than with C alone. OOP adds a much greater degree of abstraction but C++ still retains the low-level features of C, allowing programmers the freedom to use the tools that best suit the task at hand. While modern OOP languages such as Java are ideally suited to rapid-application development, they simply cannot compete with C++ in terms of efficiency and performance. Hence all major software developments, particularly operating systems, drivers, games and office applications are still programmed in C++ to this day.

Answer 2

.h files are header files. These files allow programmers to separate certain elements of a program's source code into reusable files. Header files commonly contain forward declarations of classes, subroutines, variables, and other identifiers. Programmers who wish to declare standardized identifiers in more than one source file can place such identifiers in a single header file, which other code can then include whenever the header contents are required. This is to keep the interface in the header separate from the implementation.

In C++ the standard functions are stored in header files.

Answer 3

Very simply, a function performs some type of action, whether 'internal', or visible to the user.

For example, a function could manipulate data in a file, or print text or graphics to the screen, or accept user input from an input device.