Discussion: Files with .h extension are called header files in C. These header files generally contain function declarations which we can be used in main C program, like for e.g. to include stdio.h in C program to use function printf() Exercise 2. Creating myhead.h : Write the below code and then save the file as myhead.h or you can give any name but the extension should be .h indicating it’s a header file.
Discussion: Files with .h extension are called header files in C. These header files generally contain function declarations which we can be used in main C program, like for e.g. to include stdio.h in C program to use function printf()
Exercise 2. Creating myhead.h : Write the below code and then save the file as myhead.h or you can give any name but the extension should be .h indicating it’s a header file.
// It is not recommended to put function definitions
// in a header file. Ideally there should be only
// function declarations. Purpose of this code is
// to only demonstrate working of header files.
void add(int a, int b)
{
printf("Added value=%d\n", a + b);
}
void multiply(int a, int b)
{
printf("Multiplied value=%d\n", a * b);
}
Including the .h file in other program : Now as we need to include stdio.h as #include in order to use printf() function. We will also need to include the above header file myhead.h as #include”myhead.h”. The ” ” here are used to instruct the preprocessor to look into the present folder and into the standard folder of all header files if not found in present folder. So, if you wish to use angular brackets instead of ” ” to include your header file you can save it in the standard folder of header files otherwise. If you are using ” ” you need to ensure that the header file you created is saved in the same folder in which you will save the C file using this header file.
Using the created header file :
// C program to use the above created header file
#include <stdio.h>
#include "myhead.h"
int main()
{
add(4, 6);
/*This calls add function written in myhead.h
and therefore no compilation error.*/
multiply(5, 5);
// Same for the multiply function in myhead.h
printf("BYE!See you Soon");
return 0;
}
Output:
Added value:10
Multiplied value:25
BYE!See you Soon
NOTE : The above code compiles successfully and prints the above output only if you have created the header file and saved it in the same folder the above c file is saved.
Source: Dimpy Varshni (GeeksforGeeks)
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