Bug - Function "multiplier"

[regis76]

Hello everybody,

I noticed a potential bug with the function "Multiplier". Maybe there is a rational explanation but I don't see for this moment.

I did 80*10 and the result is 32 and not 800 ??? Why???

I joined a picture.

Thank by advance at the community

regards,

Régis

[crossrulz · Accepted solution]

Your data type is a U8 or I8.  The value is being rolled over and so you get 32 (800 mod 256 = 32).

[regis76]

Yes, the local variable with the number "10" is U8. I forgot. But I'm surprised the result was 32 and not 256?

I put U16 and my problem has been corrected.

I'm a stupid man. ^^

Thank you very much.

Have a nice day,

Regards,

Régis

[RavensFan]

It can't be 256 because a U8 can only b3 0-255.

It can't be 255 because when you do math on integers and the results go out of range, the value rolls over.  It doesn't stay stuck at the max or min.

[regis76]

Ok, I understand better. Effectively, I thought the value blocked on max value 255 (and not 256, I did a mistake in my previous message, thank you for the correction).

Thank you a lot for your full explanation. Very clear.

I will sleep less stupid tonight ^^.

Have a nice day,

Regards,

Régis

[crossrulz]

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@regis76 wrote:

Yes, the local variable with the number "10" is U8. I forgot. But I'm surprised the result was 32 and not 256?

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The mathematical algorithm down in the processor does not do a range check.  It will just do that mathematical process and stop once 8 bits have been defined.