how to create our own header files

Hello friends I am here with my post which is how to create your own header files but before start I would like to explain what a header file is and why it is used in our program.
We all know that a program contain different library functions to perform the given job by user. A header file contains the definition of the functions which is included in that header file. Definition of a function tells the compiler that what operation that function have to perform or in what manner and how many number of argument it accept and how many argument it will return .the type of arguments everything about that function. There are number of header files used in c programming we just have to call as per as our requirement .header files are very useful so let’s make a header file of our own.
Follow these steps:
First of all create the definition of a function and save it with the extension .h (my_func.h)
Example:
int sum(int a,int b)
{
return(a+b);
}
·         Now create a program for adding two numbers and include it with directive #include<my_func.h>
·         And create the program and call the function which you have made
Example:
#include<my_func.h>
Void main()
{
int i,j,s;
Printf(“enter two numbers”);
Scanf(“%d%d”,&i,&j);
s=sum(i,j);
printf(“The sum of given number is =%d”,s);
}

So similarly we can make many header files using this method and call it whenever we need .
To see how to include a user defined function  in a library function visit helpaks.blogspot.in

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