lately, I had to learn C lang, when I reached the header file section I noticed that I have to include the header file that contains prototypes in the calling source and also in the source file where I defined those functions in the first place.
let's say that file.c is where I want to call the header prototypes myheader.h . Then I have to include the header #include "myheader.h" in file.c , which is understandable.
but why I can't understand is that I have to include it in the prototype definition file proto_source.c too :
/**
* THE PROTYPES DEFINITION SOURCE proto_source.c
*/
#include "myheader.h" //what this include is doing here?
void foo(void)
{
....
}
What is the logic behind that?
Doing that in C is considered beneficial as a proficient compiler would indicate disparities between the function's prototype and its implementation. Furthermore, in intricate scenarios, you may have to declare a structure or something similar in the header file that your function relies on. To avoid duplication, including the header file is the preferred approach.