Mar 4, 2025 · In C programming, a header file is a file that ends with the .h extension and contains features like functions, data types, macros, etc that can be used by any other C program by including that particular header file using "#include" preprocessor.

header files contain prototypes for functions you define in a .c or .cpp/.cxx file (depending if you're using c or c++). You want to place #ifndef/#defines around your .h code so that if you include the same .h twice in different parts of your programs, the prototypes are only included once.

Header files are additional files in a C language containing definitions of different functions and their associated variables that need to be imported into a C program with the help of a preprocessor #include statement.

Oct 24, 2017 · In C programming, a header file is a file that ends with the .h extension and contains features like functions, data types, macros, etc that can be used by any other C program by including that particular header file using "#include" preprocessor.

Each of the system header files contains a number of utility functions. These functions are often called library functions. For example, printf () and scanf () functions, needed for performing IO operations, are the library functions available in the "stdio.h" header file.

Nov 24, 2016 · In this tutorial we learn more about header files, how to create our own custom header files and why we use then in our codes.

Dec 9, 2018 · In this article I will explain how to create and include custom header file to a C program. Basic C programming, C preprocessor directives. What is C header file? C header file is a normal C file that ends with .h extension. It contains function declarations and macros.

Jul 9, 2022 · A header file in C is a file that can be shared by several source files and contains C declarations and macro definitions (see Macros).

Jan 7, 2025 · Header files in C are files with a .h extension that contain declarations of functions, macros, constants, and data types used in a program. They act as a bridge between the implementation of code and its usage, ensuring that different parts of …

In C programming, header files serve as a way to declare function prototypes, types, and macros that can be shared across multiple source files. The syntax of header files typically consists of the following elements: Here, #ifndef HEADER_NAME_H: This is known as a header guard.