Unintialized array or dynamic pointer array

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Unintialized array or dynamic pointer array #404489 07/09/12 21:50 07/09/12 21:50
Joined: Apr 2006 Posts: 159 Latvija Arrovs OP Member
Arrovs OP Member Joined: Apr 2006 Posts: 159 Latvija	So in struct i could vish line like this: Code: BMAP* bmap_array[]; it gives erros - no idea vhat bad is in this. In C# its standart. Code: BMAP* bmap_array[10]; But this vorks - but i cant knov its length at moment so it sucks. Code: function blabla(var parameter) { BMAP* bmap_array[parameter]; } And again. In function i cant initialize pointer array vith variable, but only vith handvritten number. Vhat is difference - vhy it happens? or im just too stupid to do things right? Arrovs once will publish game

Re: Unintialized array or dynamic pointer array [Re: Arrovs] #404491 07/09/12 22:04 07/09/12 22:04
Joined: Feb 2009 Posts: 3,207 Germany, Magdeburg Rei_Ayanami Expert
Rei_Ayanami Expert Joined: Feb 2009 Posts: 3,207 Germany, Magdeburg	This is the normal behavior in LiteC (and standard C). You need to initialize your (dynamic) array by "malloc" (or sys_malloc). Like, if you want to alloc space for 10 BMAP pointers: BMAP *bmap_array = malloc(sizeof(BMAP)*10); MarianFrische.com

Re: Unintialized array or dynamic pointer array [Re: Rei_Ayanami] #404492 07/09/12 22:22 07/09/12 22:22
Joined: Apr 2006 Posts: 159 Latvija Arrovs OP Member
Arrovs OP Member Joined: Apr 2006 Posts: 159 Latvija	I vant something like in c# int[] numbers = new int[5]; if it just could be int[] numbers = sys_malloc(size_of(int)5); /// int numbers = sys_malloc(size_of(int)5); makes it just like one object and i cant make pointers to one from 5 made objects. At least i didnt managed to do it vithout memory copying, but i dont vant to double memory size if i can use pointer. Ou, and thanks. I didnt knev about possibility to make pointer array.I vill try it out and im hoping it vorks good. Arrovs once will publish game

Re: Unintialized array or dynamic pointer array [Re: Arrovs] #404493 07/09/12 22:23 07/09/12 22:23
Joined: Feb 2009 Posts: 3,207 Germany, Magdeburg Rei_Ayanami Expert
Rei_Ayanami Expert Joined: Feb 2009 Posts: 3,207 Germany, Magdeburg	int[] numbers = new int[5]; is int numbers = sys_malloc(size_of(int)5); in LiteC (You can access numbers like in C# then) MarianFrische.com

Re: Unintialized array or dynamic pointer array [Re: Rei_Ayanami] #404494 07/09/12 22:40 07/09/12 22:40
Joined: Apr 2006 Posts: 159 Latvija Arrovs OP Member
Arrovs OP Member Joined: Apr 2006 Posts: 159 Latvija	Code: #define jauns(struktura) sys_malloc(sizeof(struktura)) #define jauni(struktura,daudzums) sys_malloc(daudzumssizeof(struktura)) typedef struct { int i; }Str; function main() { Str otrs; Str* tress; Str* int_mas = jauni(Str, 10); int lok_i; for(lok_i = 0; lok_i<10; lok_i++) { int_mas[lok_i].i = lok_i; } otrs = int_mas; tress = int_mass[0];//dont vork anymore } So this is all right? Strange feeling about struct array vho already is throughout initialized. But here is problem - i cant point out just to one element. Its vhat i said - nov i need copy it and its so unright. Last edited by Arrovs; 07/09/12 22:59. Arrovs once will publish game

Re: Unintialized array or dynamic pointer array [Re: Arrovs] #404505
07/10/12 06:36 07/10/12 06:36

Joined: Sep 2007
Posts: 62
Germany

bodden

Junior Member

bodden

Junior Member

Joined: Sep 2007
Posts: 62
Germany

tress is a pointer, int_mas[0] is not a pointer. try this:

Code:

#define jauns(struktura) sys_malloc(sizeof(struktura))
#define jauni(struktura,daudzums) sys_malloc(daudzums*sizeof(struktura))

typedef struct 
{
   int i;
}Str;

function main()
{
   Str* otrs;
	Str* tress;
   Str* int_mas = jauni(Str, 10);
   
   int lok_i;
   
   
   for(lok_i = 0; lok_i<10; lok_i++)
   {
      int_mas[lok_i].i = lok_i;
   }
   otrs = int_mas;
	tress = &int_mas[0];// <===== works now
	
	printf("tress.i: %.3f",(double)tress.i);
}

Re: Unintialized array or dynamic pointer array [Re: bodden] #404510 07/10/12 09:03 07/10/12 09:03
Joined: Aug 2007 Posts: 1,922 Schweiz Widi Serious User
Widi Serious User Joined: Aug 2007 Posts: 1,922 Schweiz	Is your ,w' key on your keyboard brocken? Edit: see the answer in another post from you. Last edited by Widi; 07/10/12 09:06.

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