How to malloc array of structs without knowing size

Question

I have a struct of words:

typedef struct {
   char *word;
   unsigned long occurrences;
} Word;

and I want to malloc an array of these but I don't know how large the size will be. Is there a way to malloc an array of structs without knowing the size of the array beforehand?

Thanks.

heh? if you don't know the size, what's the point of allocating memory? — Sourav Ghosh
– Sourav Ghosh, Commented Apr 21, 2016 at 17:31
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. — Sourav Ghosh
– Sourav Ghosh, Commented Apr 21, 2016 at 17:31

fandyushin · Accepted Answer · 2016-04-21 17:39:26Z

3

You can allocate memory with malloc(), and then change size with realloc()

typedef struct {
 char *word;
 unsigned long occurrences;
} Word;

int main()
{
  Word *arr = malloc(sizeof(Word) * n);
  // do smth
  // need more
  arr = realloc(arr, sizeof(Word) * more);

  return 0;
}

edited Apr 21, 2016 at 17:39

answered Apr 21, 2016 at 17:34

fandyushin

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