I cant see any dynamic here.

The pointer-array (Superku's example) is a static array, not dynamic.
And entities are static in memory once created.

Just remember to fill your array with NULLs at startup time.
eg
Code:
#define MAX_BULLET 10
ENTITY* BULLET[MAX_BULLET];

void BULLET_startup()
{  int i;   for(i=0; i<MAX_BULLET; i++)   BULLET[i] = NULL;   }


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