[c-prog] accessing structure members

Sun, 26 Dec 2004 10:57:22 -0800



OK, I'm new here and new to C.  I'm using the DJGPP (GNU) setup to
learn C.  I'm having some difficulty accessing a structure ,which I
believe I defined globally, inside a function.

Here's the list of files I'm working with:

DOS_BAT  BAT
DOS_MAK  BAT        batch file to run MAKE
DOS_XXXX MAK        MAKE file


386_XXXX C      x86 specific routines
386_XXXX H      x86 specific routine header file
DOS_XXXX C      DOS text interface


BD_XXXX  C      basic engine data
BD_XXXX  H
ENV_XXXX C      basic environmental data
ENV_XXXX H
BM_XXXX  C      basic math routines
BM_XXXX  H
CMB_XXXX C      combustion chamber routines
CMB_XXXX H

The structure is defined in bd_xxxx.h as follows:

struct engine {

    float bore;
    float stroke;
    float con_rod_len;
    unsigned short num_cyl;
    float comp_ratio;

    float int_open;
    float int_close;
    float int_valve_lift;
    float int_valve_dia;
    unsigned short num_int_valve;
    float int_port_dia;

    float exh_open;
    float exh_close;
    float exh_valve_lift;
    float exh_valve_dia;
    unsigned short num_exh_valve;
    float exh_port_dia;

    float carb_thr_size;
    unsigned short num_carb;

    char note_1[70];
    char note_2[70];
    char note_3[70];
    char note_4[70];
    char note_5[70];
};

typedef struct engine ENGINE;
ENGINE cur_engine;

Now in bm_xxxx.c I have a function that uses bore and stroke to
compute cylinder volume:

void cyl_volume(ENGINE *ptr_engine)
/*float cyl_volume(ENGINE *ptr_engine)      */
/*      float cyl_volume(*ptr_engine)            */
/*            float cyl_volume(void)                  */
{
    float cyl_vol = 0.0;

/*      cyl_vol = PI * pow((ptr_engine->bore/2), 2) * ptr_engine-
>stroke;   */

      locate(15,5);
      cyl_vol = &(*ptr_engine.bore);
      printf("bore - %2.6f", cyl_vol);

/*    return cyl_vol;            */

      pause(0);
}

The commented out definitions are things I've tried.  When I try to
compile this, I get:

  parse error before *

and

  ptr_engine not defined

Any help would be appreciated.

Willy

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