Re: basic BASIC question

On 1/31/2025 7:38 PM, Dave Froble wrote:

On 1/31/2025 11:53 AM, Arne Vajhøj wrote:

On 1/31/2025 11:39 AM, Dave Froble wrote:

On 1/31/2025 10:18 AM, Arne Vajhøj wrote:

Is it common to use:
>
declare integer constant TRUE = -1
declare integer constant FALSE = 0
>
>
?

>
It works.  Doesn't really matter if declared a constant.  Zero is false,
anything else is true.  Using 1 vs -1 has been more my experience.

>
I got the impression that the manual/compiler prefer -1 over 1.

 Manuals usually have a preference, but, can be incomplete.
 

print not 0%
>
does print -1.

 That is an operation to flip the bits.  The opposite of 0000000000000000 is 1111111111111111 ...

Ah - yes. The manual say that NOT is bit wise but AND, OR and XOR
are logical.
<quote>
Operator Example Meaning
NOT NOT A% The bit-by-bit complement of A%. If A% is true (–1), NOT
A% is false (0).
AND A% AND B% The logical product of A% and B%. A% AND B% is true
only if both A% and B% are true.
OR A% OR B% The logical sum of A% and B%. A% OR B% is false only if
both A% and B% are false; otherwise, A% OR B% is true.
XOR A% XOR B% The logical exclusive OR of A% and B%. A% XOR B% is
true if either A% or B% is true but not if both are true.
</quote>
Arne