Nothing "happens", but if you dont put null in you get random numbers in them.
That then makes it more difficult to know which ones are used or not.

If you NULL them all, you can then use this to see what elements are in use.
Code:
if(BULLET[idx]) { bullet-IS-being-used     }
else            { bullet-is-NOT-being-used }

//or

if(BULLET[idx]==NULL) { bullet-is-NOT-being-used     }
else                  { bullet-IS-being-used }

Just remember to set them to NULL when youve finished using them...
Code:
ent_remove(BULLET[idx]);
BULLET[idx] = NULL;


"There is no fate but what WE make." - CEO Cyberdyne Systems Corp.
A8.30.5 Commercial