Subject: SP

(This message is being sent to all CPSC 102 Sec 1 students )

Another student points out:

"When working on the project, I received an error:

camera.c:4: error: conflicting types for camera_init
rayhdrs.h:23: error: previous declaration of camera_init was here

I think this is because the function in the notes was a void
function, but the function in the "rayhdrs.h" file is camera_t
*camera_init Which one am I supposed to use?

Also, this compiles as a warning:

camera.c:14: warning: implicit declaration of function !Fcamera_load_attributes!G

Does this mean I need to type that prototype into the "rayhdrs.h" file?"


---------------------
Answer:


As you have correctly  understood,  the problem is incompatibility
between notes and rayhdrs.h.  Fix rayhdrs.h to be consistentent
with the version in the notes.

   void camera_init(
   FILE *in,
   model_t *model,
   int  attrmax);

-------------------------------------------

On the second problem, since camera_load_attributes() is a
private function to the camera module you should either

(1) put a prototype for camera_load_attributes() at the top of camera.c

or

(2) just rearrange the code so that camera_load_attributes()
appears physically before camera_init()

I use approach (2) but either one is perfectly fine.