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Sep 12th, 2007
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Multiple files

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I have this C program with multiple files and I want to introduce a new file called enemy.c.
and I'm wondering if I'm going about this right.

game.h 
  1. #ifndef GAME_
  2. #define GAME_
  3.  
  4. extern void game (void);
  5. extern void enemyFunc (void);
  6. extern int enemyPosX;  
  7.  
  8. #endif
main.c
  1. int main (void) 
  2. {
  3.     game();
  4. }
game.c
  1. #include "game.h"
  2.  
  3. int enemyPosX = 452;
  4.  
  5. void game (void)
  6. {
  7.    enemyFunc();
  8. }
enemy.c
  1. #include "game.h"
  2.  
  3. void enemyFunc (void)  
  4. {
  5.   enemyPosX -= 4;  
  6. }
The program works but I'm wondering if I should make a new file called enemy.h
and put

extern void enemyFunc (void);
in it instead of in game.h, to have a header defining each .c file?
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Colin Mac is offline Offline
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Sep 12th, 2007
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Re: Multiple files

>The program works but I'm wondering if I should make a new file called enemy.h
You can if you'd like. I don't see any benefit for it at this point though.
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Sep 12th, 2007
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Re: Multiple files

If I were to do it, I would need to include "game.h" in enemy.c as well seeing as I'm using the variable enemyPosX from it?
Last edited by Colin Mac; Sep 12th, 2007 at 5:22 pm.
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Sep 12th, 2007
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Re: Multiple files

>If I were to do it, I would need to include "game.h" in enemy.c
>as well seeing as I'm using the variable enemyPosX from it?
I would move everything that pertains to enemies into enemy.h. Then you would need to include enemy.h in game.c, which is a smidge more intuitive.
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Re: Multiple files

Thanks for your help.
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Mar 27th, 2010
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Re: Multiple files
Hi I wrote a code that may serve a good example for future visitors. Thought I'll post it anyway even though ur question has been answered.

  1. /* Working with Multiple C files Example program by virgoptrex (c) 2010 */
  2. /* All extern variables and structures defined here */
  3. /*This is lol.h */
  4.  
  5. #ifndef _LOL
  6. #define _LOL
  7.  
  8. extern int howdie;
  9. #define me 10
  10. extern void lol2();
  11. extern void lol3();
  12. extern int a1;
  13. extern int b1;
  14.  
  15.  
  16. extern int hello();
  17.  
  18. typedef struct lol123{
  19.  
  20. int dude;
  21. char alpha;
  22.  
  23. }lol123;
  24.  
  25.  
  26. extern lol123 lolol;
  27.  
  28. #endif

  1. /* Working with Multiple C files Example program by virgoptrex (c) 2010 */
  2. /* always a good practice to make a common group file*/
  3. /* There may be multiple common group files in a project*/
  4. /* This file is common to 'lol1.c','lol2.c','lol3.c'*/
  5. /*This is common.c */
  6.  
  7. #include "lol.h"
  8.  
  9. int hello();
  10. void lol2();
  11. void lol3();
  12. lol123 lolol;
  13.  
  14. int a1;
  15. int b1;
  16.  
  17. int hello(){
  18. int howdie=10;
  19. return howdie;
  20. }

  1. /* Working with Multiple C files Example program by virgoptrex (c) 2010 */
  2. /*This is lol1.c */
  3.  
  4. #include <stdio.h>
  5. #include "lol.h"
  6.  
  7.  
  8. int main()
  9. {
  10. printf ("lol1:hello+me %d\n", hello()+me);
  11. lol2();
  12. lol3();
  13. return 0;
  14. }

  1. /* Working with Multiple C files Example program by virgoptrex (c) 2010 */
  2. /*This is lol2.c */
  3.  
  4. #include <stdio.h>
  5. #include "lol.h"
  6.  
  7. /* please don't write something like 'b1=20' here outside void lol2() function */
  8.  
  9. void lol2()
  10. {
  11. b1=20;
  12. lolol.alpha='a';
  13. lolol.dude =12;
  14. printf ("This is lol2: %d\n", hello());
  15. printf ("lol2: alpha = %c and dude+b1 = %d\n", lolol.alpha, lolol.dude+b1 );
  16. }

  1. /* Working with Multiple C files Example program by virgoptrex (c) 2010 */
  2. /*This is lol3.c */
  3.  
  4. #include <stdio.h>
  5. #include "lol.h"
  6.  
  7.  
  8.  
  9. void lol3()
  10. {
  11. lolol.alpha='b';
  12. lolol.dude =99;
  13. a1=2;
  14. printf ("hello from lol3 %d\n", hello()+me+me);
  15. printf("lol3: alpha %c and dude+a1 %d \n", lolol.alpha, lolol.dude+a1 );
  16.  
  17. }

  1. #The Makefile (c) 2010 by Virgoptrex
  2. sample:
  3. 	gcc -c lol1.c lol2.c lol3.c common.c
  4. 	gcc lol1.o lol2.o lol3.o common.o -o lol
  5.  
  6. clean:
  7. 	rm -r lol1.o lol2.o lol3.o common.o lol
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