How to write header file in c programming

Save the file with the same name but the extension. You might have noticed as I have included util. Just like util. You can use the command to find all header file locations included in your program. So basically both the functions printf and sumOfTwoNumbers are defined in the remote file. To use these functions, you need to add respective header files.

I tried my best to make it simple. Hope you understand this tutorial to create a header file in the C program. Save my name, email, and website in this browser for the next time I comment. What do you want to Learn Today?

How to do that? Writing C program with a function definition that needs to be called from another program file A header file with declarations of all the defined functions C program file to call the remote functions How to Create Header File in C Program?

Here is a step-by-step procedure with complete code and a detailed explanation with examples. Step 1: Write a program and define any function that needs to be called from other files. Step 2: Create header file in C Program and declare all the functions defined in the above util. A header file is a file with extension. There are two types of header files: the files that the programmer writes and the files that comes with your compiler. You request to use a header file in your program by including it with the C preprocessing directive include , like you have seen inclusion of stdio.

Including a header file is equal to copying the content of the header file but we do not do it because it will be error-prone and it is not a good idea to copy the content of a header file in the source files, especially if we have multiple source files in a program.

Both the user and the system header files are included using the preprocessing directive include. This form is used for system header files. It searches for a file named 'file' in a standard list of system directories. You can prepend directories to this list with the -I option while compiling your source code.

Below is the illustration of header file: CPP. Skip to content. Change Language. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. Output: Using math. We provide nothing but the best curated videos and practice problems for our students.