Re: [Dev-C++] Structures and Arrays and Pointers, Oh My!

[<or...@vp...>]

David McKen wrote:
> Ok, I am having trouble using the above 3 together.
>  
> Slay_msg is a array of pointers to characters (strings)
> struct pc_data {
>   char * slay_msg[3];
> }
>  
> //a pointer to pc_data is a member of the char_data struct.
> struct char_data {
>    ...
>    pc_data *  pcdata;
> }
>  
> //A pointer is declared of type char_data and initalized to the required 
> values.
> char_data * ch = new char_data; //Assume everything has been initalized.
>  
> My question is: How do I access the strings in the array slay_msg?

First of all, this is NOT a pure C program, as you are using "new", and 
that is only in C++.
Do you EXPLICITLY create pcdata inside ch? As it will *not* be created.
This is what I have done, and this works:

int main()
{
   char_data *ch = new char_data;
   ch->pcdata = new pc_data;
   ch->pcdata->slay_msg[1] = "Dead!";
   printf("%s\n",ch->pcdata->slay_msg[1]);
   delete ch;
   return 0;
}

Another note: slay_msg is an array of pointers, so you can only assign 
values to them, not copy into them!

Access is as follows: ch->pcdata->slay_msg[<index here>], what you used! 
Your problem is at creation I guess. You don't initialize pcdata I 
think. You must explicitly create it, as it's constructor won't get 
called (it is a pointer)!

But again, I WARN you! This is *not* pure C! C doesn't have "new", and 
structs should be typedefed, so you can create variables without writing 
the "struct" word before the declaration. ("struct char_data ch;" would 
be needed in pure C)

Try to compile it with gcc, not g++. It won't :)

--
Greetings,
   Balázs