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

[Ioannis V. <iv...@at...>]

-----Original Message-----
From: dev...@li...
[mailto:dev...@li...] On Behalf Of David =
McKen
Sent: Friday, May 09, 2003 5:52 AM
To: dev...@li...
Subject: [Dev-C++] Structures and Arrays and Pointers, Oh My!



Ok, I am having trouble using the above 3 together.
=20
Slay_msg is a array of pointers to characters (strings)
struct pc_data {
  char * slay_msg[3];
}
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//a pointer to pc_data is a member of the char_data struct.
struct char_data {
   ...
   pc_data *  pcdata;
}
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//A pointer is declared of type char_data and initalized to the required
values.
char_data * ch =3D new char_data; //Assume everything has been =
initalized.

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Since you use operator new, it is a C++ program. In C you have to use =
the
malloc() family.
=20

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My question is: How do I access the strings in the array slay_msg?
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ch->pcdata->slay_msg[<index here>];=20

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C90:
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unsigned long i;
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char_data *ch=3Dmalloc(sizeof(*ch));
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if(!ch)
{
  /* Error handling code */
}
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ch->pcdata=3Dmalloc(sizeof(*(ch->pcdata));
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if(!(ch->pcdata))
{
 /* Error handling code */
}
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for(i=3D0; i<3; ++i)
{
  ch->pcdata->slay_msg[i]=3Dmalloc(WHATEVER_SIZE_OF_CHARACTERS);
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  if(ch->pcdata->slay_msg[i]=3D=3DNULL)
  {
      /* Error handling code */
   }
}
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This low level stuff in C++98:
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#include <new>
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// This try block in reality is usually applied in the function call, =
not in
the definition
// but i place it here to demonstrate the whole error handling =
mechanism.
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try
{
=20
  char_data *ch=3Dnew char_data;
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   ch->pcdata=3Dnew pc_data;
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   for(unsigned long i=3D0; i<3; ++i)
       ch->pcdata->slay_msg[i]=3Dnew char[WHATEVER_SIZE_OF_CHARACTERS];
}
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catch(std::bad_alloc)
{
  // Error handling code
}
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=20
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Ioannis Vranos

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