Message-ID: <33D1C734.C2A91B6E@gapeach.com>
Date: Sun, 20 Jul 1997 04:07:17 -0400
From: Jacob Martin <jake AT gapeach DOT com>
Reply-To: jake AT gapeach DOT com
MIME-Version: 1.0
Newsgroups: comp.os.msdos.djgpp
Subject: Re: declaring/passing ptrs to @D arrays
References: <33D10773 DOT 45C94A8D AT gapeach DOT com> <01bc94f3$a22308a0$b756dec2 AT algorithm>
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Russ Williams wrote:

> Jacob Martin <jake AT gapeach DOT com> wrote in article
> <33D10773 DOT 45C94A8D AT gapeach DOT com>...
> > how do I do this?  I keep getting bad comilation stuff....
> >
> > I thought I had it right, then I started the whole..."hmmm, add
> another
> > star?hmmm remove a star...hmmm"
> >
> > and I finally got it to compile( halfway) but it gives me this:
> >
> > E:\game>gxx test.cc -lj -lm
> > e:/djgpp/tmp\ccdaaaaa(.text+0xc0):test.cc: undefined reference to
> > `mapmaker(int
> > *, int)'
> > e:/djgpp/tmp\ccdaaaaa(.text+0x170):test.cc: undefined reference to
> > `frenchtile(i
> > nt *, buffer_rec *, bufinde *, int)'
> >
> > Here's the relevant  code...
> >
> > void frenchtile(int *,buffer_rec *bufferptr,bufinde *btp, int);
> > void mapmaker (int *,int) ;
> [...]
> > void frenchtile(int **mmp,buffer_rec *bufferptr,bufinde *btp,int
> page)
> [...]
> > void mapmaker (int **mmp, int size)  {
>
> The problem is that you're using C++ ;). If you compiled that code as
> C,
> the compiler would shout at you for passing int * to a function that
> wants
> int **. C++ allows multiple definitions for a given function, with
> different parameter types, so it compiles and then tries to link to
> the
> mapmaker (int **,int) function, which doesn't exist...
>

OK, now I get this...:

E:\game>gcc test.cc -lj
test.cc: In function `int main()':
test.cc:58: assignment to `int **' from `int *'

  I just can't seem to get the damn pointer procedural stuff to work:
So, what's the correct way to set a pointer to the first address of
mapmake, and then pass it to a function...

Please fill in the blanks for me:

void passit(int ___);  /* pass the pointer,Do I use one or two *'s?

int main()  {

int mapmake[100][100], __mmp; /*???????????????*/
mmp=&mapmake[0][0];   /*????????????*/
passit(int __mmp);
}
void passit(int __)  {

printf("whoopie!");
}



/*this is the old code*/



void frenchtile(int *,buffer_rec *bufferptr,bufinde *btp, int);
void mapmaker (int *,int) ;
int main(void) {


int *mmp;
int mapmake[100][256];

mmp=&mapmake[0][0];

mapmaker(mmp, size);
frenchtile(mmp,bufferptr,btp,page);

void frenchtile(int **mmp,buffer_rec *bufferptr,bufinde *btp,int page)
{

        int loop;
        int index;
        int x,y=0;
        for (loop=0;loop< 256;loop++)  {

                if ((loop%17)==0)
                 {
                 y=(32*(loop/17));
                 }
                if (x==544) x=0;
                if (*(*(mmp+page)+loop)!=NULL)
                   {

                index=*(*(mmp+page)+loop);

screen_blit_buff_to(x,y,bufferptr,btp[index].bx1,btp[index].by(THIS PART

I couldn't paste, but it don't matter);
                    }


                 x+=32;
        }
}

void mapmaker (int **mmp, int size)  {


  char width[100];
  int loop,count,loopa,first,second;

  /*SET LAND AREA*/
  for (loop=0;loop < 100; loop ++)  {
        width[loop]=rand() % 2;
        }
  /*REMOVE SIZE AMOUNT OF LAND*/
  for (loop=0;loop< 98;loop=loop+size)  {
        width[loop]=0;
       }
  /*MAKE EACH SCREEN WITH LAND FLAG*/
  for (loop=0;loop<100;loop++)  {
        if (width[loop]==1)  {
             first=1 + rand() % 8;
            second=10 + rand() % 17;
             while (count < 10)  {
             for (loopa=(10*count)+first;loopa <=  (10 *
count)+second;loopa++) mmp[loop][loopa]=1;

               count ++;
              } /*END WHILE*/
        }/*end IF*/
}/* end for*/

}



> [...]
> > Thanks...
> >
> No problem.
>
> ---
> Russ