best practices doing non-static distance arrays c / c++?

if i have an array bound distance depending tangible used, i typically twin ways anxiety it.

array form 1: given bound distance formed define, i only interpretation loops referencing it.

#define maxplayers 4

int playerscores[maxplayers];

for(i=0;i<maxplayers;++i)
{
.... something any player
}

array form 2: given array grow equipment total it, i sizeof count array entries it. distance converted consistent compiler there shouldn't any runtime chastisement doing way.

typedef struct
{
    fields....
}mystruct_def;

mystruct_def mystruct[]={
   {entry 1},
   {entry 2},
   {entry 3...n}
   };

 for(i=0;i<(sizeof(mystruct)/sizeof(mystruct_def));++i)
 {
 ..... something any entry
 }

is there some-more glorious fortitude doing guess arrays but going past finish pause too early. thoughts? comments?