Thread: Dynamic memory

Hi guys,

I would like to check with all of you. Let say if I would like to do something inside a function. Will it be better if I delcare a dynamic memory then using a static one?

Let say if I would like to store the value of the array into a temp array inside a function. How can I do it? will it be something like that? Do I need to add a null at the back of the char array ? what was the best way to do it ?

Code:

void function(char* item1)
{
   unsigned int i;

   char *p = (char*)malloc(strlen(item1) * (char))
 
    for(i=0;i<strlen(item1);i++){
              
    p[i] = item1[i];

   }
   

   // some code 
   free(p); 
}

Dynamic memory will probably be most appropriate in this situation, and you deal with it mostly appropriately. Few minor things:

1) Yes, you do need strlen + 1 for the extra null-byte.
2) You don't want to check to strings length on each loop iteration if it is unchanging. Initialize a variable with strlen(item) and use it in the loop condition.
3) Don't cast the return value of malloc.

Thanks Tonto.

By the way, what do you mean by cast a return value? I'm pretty new so if you don't mind could you briefly explan what you mean by that ?

ptr = (char *) malloc();
-------^^^^^

That'd be a cast. Kind of like when you'd want to force an int to a char:

ch = (char) intvar;

Oh... I get it ..Thanks kennedy

Just one more thing, let say if I want to allocate memory to a pointer. Must I always check that whether there is enough memory? what will be ideal way to deal with pointer?