2d arrays

[Mungo]

I need to implement a 2D array of a variable size but i dont know how to malloc 2d arrays anyone know how??

thanks for any help.

[Andrew Davey]

try this link, not sure if it will help havent looked in a long time:

http://www.iota-six.co.uk/c/f7_dynam...allocation.asp

[miko]

for example you want array of floats

int arrayheight = 666;
int arraywidth = 5;
int i;
float **array;
 
array = (float**)malloc(sizeof(float*) * arrayheight);
if(*array == NULL) {
  fprintf(stderr,"not enought memory! buy a better machine!\n");
  exit(1);
}
 
for(i=0;i<arrayheight;i++) {
  array[i] = (float*)malloc(sizeof(float) * arraywidth);
  //TODO: check if malloc was succesful;-)
}
 
/* ...do something with array... */
 
for(i=0;i<arrayheight;i++)
  free(array[i]);
 
free(array);
 
/* we are done!!! let's buy another beer :)*/

should work...