如何在不知道大小的情况下分配结构数组

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.

Answer 1

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;
}