# First test **I want to succeed this way**

In folder Source file main.c

In folder Source file controller.c

In folder Headers file controler.h

In folder .vscode file c_cpp_properties.json

In folder .vscode file launch.json

#include <stdlib.h>
#include <stdio.h>
#include "controller.h" 


int main(){

double resultat;
resultat = airRectangle(10.0,20.0);

printf("L'aire du rectangle est %f",resultat);

    return 0;
}

`Give me

fatal error No such file or directory`

`#include "controller.h"
      |          ^~~~~~~~~~~~~~`

`# Second test

It works correctly this way for small projects so please help me
[J'ai changer le fichier controller.h dans le dossier source et changer dans le fichier main.c ( #include "controler.h" ) pour (#include "controller.c ) I change the controller.h file in the source folder and change in the main.c file ( #include "controler.h" ) to (#include "controller.c )I](https://i.sstatic.net/lmTju69F.png)I watch on stack overflow and youtube for all answer.`