actionscript 3 - Why does uint break my for loop? -

this not problem fix simple , pretty costless. i'm guessing it's property of for or uint don't understand , know going on so...

using actionscript 3 set for loop run backwards through elements of vector.

var limit:uint = myvector.length-1; for(var a:uint = limit; >= 0; a--) {     trace(a); } 

when run outputs 2, 1, 0 expected moves on 4294967295 , begins counting down there until loop times out , throws error #1502.

the fix type a int rather uint don't why. surely dealing values of 0 , greater uint correct data type right?

i guess 4294967295 max value uint how count there?

if do

var myuint:uint = 0; trace(myuint - 1); 

then output -1 why, in loop should jump 4294967295?

sorry rambling question , cheers help.

you close. said, loop gives 2, 1, 0, 4294967295. because uint can't negative. loop run while a >= 0 , since never -1 break loop condition, continues loop forever.

var myuint:uint = 0; trace(myuint - 1); 

i didn't test happening myuint being converted int , having 1 subtracted. following code should able confirm this.

var myuint:uint = 0; trace((myuint - 1) uint); trace((myuint - 1) int); 

to fix loop use int or use for each(var x:type in myvector) loop if don't need index (a).