Modular Programming

hi all
take a look at this codes

Code:

---

/*source.c*/
#include<stdio.h>
#include "file.h"
main()
{
      char *name="strom man\n";
      sy_hay(name);
      }

---

Code:

---

/*file.c*/
#include "file.h"
void say_hay(char *string)
{
    printf("Hy %s",string);
    }

---

Code:

---

/*file.h*/
void say_hay(char *string);

---

i get this

Code:

---

  Circular ss <- ss.o dependency dropped.

---

? i don't get it ? why is that?

Why are you including file.h in file.c ?

It gives me a linker error

Code:

---

/*source.c*/
#include<stdio.h>
#include "file.h"
main()
{
      char *name="strom man\n";
      sy_hay(name);  // shouldn't it be say_hay(name);
}

---

but hen what is ss and ss.o ?

BTW including file.h in file.c is ok but not necessary in this case.

Kurt

file.h has already been included by "source.c", but it's been included again by "file.c"

You need some 'inclusion guards'

ie in file.h

Code:

---

#ifndef INCLUDED_FILE_H
#define INCLUDED_FILE_H

extern void say_hay(char * string);

#endif /* INCLUDED_FILE_H */

---

Quote:

---

Originally Posted by zacs7

You need some 'inclusion guards'

---

They are always a good idea but not "needed" in this case.

We have two compilation units in this case. each includes file.h only once -> no problem.
'inclusion guards' protect against multiple inclusions in the same compilation unit only.
Kurt

Sorry, it's become a habit for me to use them everywhere :)

Just incase it is included more than once ;)

Willie Mays won't like it unless "say_hay" is spelled the same in all three files. :D

Edit:

I was suggesting that the spelling might be the cause of errors in your program, of course.

sorry about the spelling :(
and thanks for the advices
i will be back