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Explain the custom header files in C language
Problem
Can the user create his/her own custom header files in the C language? If yes, how can we access the user-defined header files?
Solution
Yes, the user can create his/her own custom header files in C.
It helps you to manage the user-defined methods, global variables, and structures in a separate file, which can be used in different modules.
Let’s see an example of how to create and access custom header files −
Example
Given below is the C program to call an external function named swap in the main.c file.
#include<stdio.h>
#include"swaping.h" //included custom header file
void main(){
int a=40;
int b=60;
swaping (&a,&b);
printf ("a=%d
", a);
printf ("b=%d
",b);
}Swapping method is defined in swapping.h file, which is used to swap two numbers by using a temporary variable.
This code is saved by using swapping.h in same folder, where the main.h is saved.
void swapping (int* a, int* b){
int temp;
temp = *a;
*a = *b;
*b = temp;
}Note
Header file have .h file extension.
Both files swapping.h and main.c must be in the same folder.
To differentiate between predefined and custom-defined header files, instead of <swapping.h>, we have written #include "swapping.h".
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