Header File Creation in C

Creating a header file in C is a common practice to declare function prototypes, constants, and macros that can be used across multiple source files in a C program.

Open your preferred text editor or IDE and create a new file. By convention, header files usually have a '.h' extension, For example : pba.h.

Inside the header file, declare your functions using function prototypes and define any constants or macros that you want to make available to other source files.

Save the file with a '.h' extension, such as 'pba.h'.

• 1. Include the Header File: In your C source files where you want to use the functions or constants, include the header file using #include directive :   #include "pba.h"
• 2. Use the Functions and Constants:Once included, you can use the functions and constants defined in 'pba.h' just like any other function or constant in your program.

#include<stdio.h>
#include"pba.h"
 
main() 
{
   int num1 = 10, num2 = 10, num3;
   num3 = add(num1, num2);
   printf("Addition of Two numbers : %d", num3);
} 

header files are essential in C programming for structuring code, managing dependencies, promoting reusability, and enhancing overall code organization and maintenance. They are a foundational tool for building modular and maintainable software systems in C.