fejlécfájlokban

The term "fejlécfájlokban" is a Hungarian compound word that translates to "in header files". In the context of computer programming, it refers to the practice of including or referring to header files within other source files. Header files, often denoted by the `.h` or `.hpp` extensions, typically contain declarations of functions, classes, variables, and macros. They act as an interface, informing the compiler about the structure and existence of code defined elsewhere, often in corresponding `.c` or `.cpp` source files.

When a programmer uses the `#include` directive in C or C++, they are essentially instructing the preprocessor to insert the contents of the specified header file at that point in the source code. This allows different parts of a program, or even separate programs, to share common declarations and definitions, promoting modularity and reusability. By organizing code into header and source files, developers can manage complexity, facilitate collaboration, and ensure that interfaces are consistent across different modules. The phrase "fejlécfájlokban" highlights this fundamental aspect of how code is structured and organized in many programming languages.