Comments

• AsmGuru62

  May 2011

  [color=Blue]Header file contains function prototypes, structure declarations, constant definitions, like #define.[/color]
  [code]
  //
  // MODULE1.H FILE:
  //
  void func1 (int x);
  float func2 (float y);
  int func3 (char a);
  [/code]
  [color=Blue]Source file contains function bodies. It is preferred that names of both files are same, but they have different extension, like MODULE1.H and MODULE1.C:[/color]
  [code]
  //
  // MODULE1.C FILE:
  //
  #include "MODULE1.H"
  
  void func1 (int x)
  {
  // ... your implementation here ...
  }
  
  float func2 (float y)
  {
  // ... your implementation here ...
  }
  
  int func3 (char a)
  {
  // ... your implementation here ...
  }
  [/code]
  
  [color=Blue]After these TWO files are done they are used in a project - or you call it a large program. Usually, the development environment which you use has the ability to insert files into project. You need to insert both files into projects and then just "#include ".h"" into other C files of the project where you need those functions.
  
  If you do not have an environment (like Dev-C++ or Visual C++ or something else...) then "include .c" is the way to go.
  
  There are few other ways: like to compile the C file into .OBJ file and then use LINK tool to build the full program. It is usually done by the environment, but you can also do it manually - using command line tools.
  [/color]
• lutzhell

  July 2013

  And don't forget to put your header code between [link=http://en.wikipedia.org/wiki/Include_guard]include guards[/link] to avoid problems with multiple inclusions.
  
  Like this:
  
  module1.h:
  [code]
  #ifndef MODULE1_H_
  #define MODULE1_H_
  
  //
  // MODULE1.H FILE:
  //
  void func1 (int x);
  float func2 (float y);
  int func3 (char a);
  
  #endif // MODULE1_H_
  
  [/code]
  
• srinathReddyD

  August 2013

  You can find the complete details and the tutorial on creating header files in c from the below link
  
  [link=http://www.beginners-tutorials.com/2012/05/how-to-create-our-own-header-files-in-c.html]How To Create Header And Library Files in C[/link]
  
  Regards:
  Srinath Reddy.
  http://www.beginners-tutorials.com
  
• srinathReddyD

  August 2013

  check the below link for complete tutorial on creating header files in c.
  
  [link=http://www.beginners-tutorials.com/2012/05/how-to-create-our-own-header-files-in-c.html]How To Create Header And Library Files in C[/link]
  Regards:
  D.srinath Reddy
  Admin
  http://www.beginners-tutorials.com
• tushars1994 Pune

  August 2016

  It is very simple. Follow the steps below:
  1. Create a .h file.
  2. Create a .c file and include the header file in it.
  Find more about how to create own header files in C Programming here: C Program To Create Your Own Header Files
  This is the sample:

  include<stdio.h>

  include"newheaderfile.h"

  void main()
  {
  printf("Sum:\t", sum(10,20));
  }
• webiletechnologies India

  September 2016

  A header file is a file with extension .h which contains C function declarations and macro definitions to be shared between several source files. 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.h header file, which comes along with your compiler.

  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.

  A simple practice in C or C++ programs is that we keep all the constants, macros, system wide global variables, and function prototypes in the header files and include that header file wherever it is required.