Thread: Organizing files/function in header files.

Hi all,

if i have the following
a header file called "temp.h" :

Code:

#ifndef TEMP_H
#define TEMP_H
double to_celsius(double fahrenheit);
#endif

the temp.cpp file :

Code:

#include "temp.h"
double to_celsius(double fahrenheit){
      double celcius = (fahrenheit - 32) * 5.0 / 9.0;
      return celcius;
}

the main.cpp:

Code:

#include "temp.h"
int main() {
    cout << to_celsius(32) << endl;
    return 0;
}

My question, is it necessary to include the header in "temp.cpp" and "main.cpp" ? or is it enough only "main.cpp" (because it works for me when i include it only in main.cpp).

are there different cases? or is there some best practice?

any hints or links to read more about it is appreciated

alright, got it, thanks a lot