FOR LOOP repeating

[em00k]

I find this for loop repeats, only happens if to is set to 255

for x = 0 to 255 
	print at 0,0;x
	pause 1
next x 
pause 0

[ghost]

That's to be expected if x is of type UByte.
By default, if you don't DIM x it will assign the shortest / narrowest type (UByte in this case).

FOR loops like the above means the loop must enter when x = 255, and stop when x = 256. Since x is of type UByte, it will never reach 256. Hence the infinite loop.

EDIT: I repost my comment because the previous response has been lost :(

[em00k]

Sorry ignore my last post on this.

[boriel]

I've been thinking of an alternate (and efficient) way to implement this, by using Carry Flag (at least for 8 bits variables).
Maybe in the near future I could come up with a better solution.
In the mean time, the loop above can be rewritten as:

Dim x as UByte
Let x = 0
Do
  Print At 0, 0; x
  Pause 1
  Let x = x + 1
Loop Until x = 0  : REM yes, overflow

[boriel]

Alternatively, the initial FOR loop will cause the Z80's Carry Flag to be set. Maybe I can take advantage of this and detect the FOR loop ending!