Btukfyl

So I have 3 files: main.c,countries.h and countries.c

I declare pointer of the structure called "Country" in the countries.h

I have included the countries.h in countries.c and in main.c

and declared the structure its self in countries.c

countries.h

typedef struct Country* pCountry;

countries.c

struct Country {

    char *name;

    pCity cities;

    int numCities;

    pTerritory countryTerr;

};

now, I want to create array of pointers of the Country structure, using malloc

so I did that:

pCountry countries_array;

countries_array = (pCountry); 

malloc(num_of_countries*sizeof(countries_array));

and to assign pointers to each pointer,even though the malloc, does seems to work I cant

assign pointers to the elements in the array using :

countries_array[0]= new_pointer;

I get "invalid use of undefine struct country" and "derefrecing pointer to incomplete",

what is the problem with the code?

thanks

Looks good. Just assign it to something of the same type, struct Country. Also, as pointed out in the comments, it should be malloc num_of_countries * sizeof struct Country (not the pointer type), which is now correctly dereferenced below as sizeof (*countries_array) which also works.

pCountry countries_array;

countries_array = malloc(num_of_countries * sizeof (*countries_array));

struct Country Jefferson = {"Jefferson", 1,2,3 };

countries_array[0] = Jefferson;



// don't forget to free the memory when no longer needed.

free (countries_array);

If we must put a pointer into this array of structs, we can either dereference the pointer like countries_array[0] = *pointer, or... we could declare countries_array as an array of pointers, instead of an array of structs. Perhaps this is what you may want. Either way, the actual structures have to occupy memory somewhere...

pCountry *countries_array = malloc(num_of_countries*sizeof countries_array);

pCountry j = &Jefferson; // `&`, "address of" operator

countries_array[0] = j; // put a `pointer` into the array...