Copying arrays of structs in C

Question

It\'s been a long since I don\'t use C language, and this is driving me crazy. I have an array of structs, and I need to create a function which will copy one array to another (

Answer 1

This has a feel of poorly masqueraded homework assignment... Anyway, given the predetermined call format for copySolution in the original post, the proper definition of copySolution would look as follows

void copySolution(struct group (*a)[4], struct group (*b)[4])
{
  /* whatever */
}

Now, inside the copySolution you can copy the arrays in any way you prefer. Either use a cycle

void copySolution(struct group (*a)[4], struct group (*b)[4])
{
  const struct group *pb, *pbe;
  struct group *pa;

  for (pa = *a, pb = *b, pbe = pb + sizeof *b / sizeof **b; 
       pb != pbe; 
       ++pa, ++pb)
    *pa = *pb;
}

or use memcpy as suggested above

void copySolution(struct group (*a)[4], struct group (*b)[4])
{
  memcpy(b, a, sizeof *b);
}

Of course, you have to decide first which direction you want your arrays to be copied in. You provided no information, so everyone just jumped to some conclusion.