Flowcode Support Board

Hi!

I am playing with a project with an Ili9341 and an ESP32 with XPT2046

If I use an IF contain this: X > 34 AND X < 130 AND Y > 110 AND Y < 65 I get an error when compiling look like the ESP32 don´t like AND. It work with arduino and Arm I also try with &

Is there other command for AND in ESP32?

****** SOLVED***** Search in the net, USE &&

Thank´s in advance

Jorgen

Hi, Jorgen.
Just to clarify, You always use && instead of AND in any decisions when comparing values.
&& is Logical.
AND is bitwise.
Also for when comparing values use the following logical operators:
|| = OR (| is the pipe key next to Z on a UK keyboard).
! = NOT

Hi MArtin!

Thank you very much. Learn some new today

So AND versus is not equal to && I have earlyer used OR and AND in Arduino and Pic whith good luck.

Thank´s again I will be aware in the future

Br Jorgen

Hi Jorgen,
Your'e welcome.

jgu1 wrote: ↑

Tue Mar 09, 2021 6:29 pm

So AND versus is not equal to &&

No definitely not the same.
The AND OR NOT etc for bit wise manipulation only.

The bitwise AND (&) can sometime appear to work like the logical &&, but not always. I think it's always safer to avoid "AND", "OR", etc., and always use the correct symbol (e.g. & or &&) to avoid confusion.

For example, consider three byte variables (X=1, Y=2, Z=3) in the following decisions:

"if (X & Y)" is false, but "if (X & Z)" is true (the bitwise operator results in "if 0" and "if 1" respectively).

"if (X && Y)" is true, and "if (X && Z)" is true (X, Y and Z are all non-zero and converted to "true" when using the logical operators).

Hi Martin and Steve!

Thank you very much. Yes , I though it doesn´t matter how to use And as Steve said it sometimes work I Expeince it work with AND OR ect. It have always used this. I am glad to know your explanation and of course, from now always use you advice.

But please tell me, why sometime use two &,|.

Eks:

If A & B =2

If A && B =2

Br Jorgen

Google C operators

jgu1 wrote: ↑

Thu Mar 11, 2021 5:57 pm

But please tell me, why sometime use two &,|.

Single is boolean operation: "10 & 7" => 2

Double is a logical operation: "true && false" => false

A further complication is that in logical operations (e.g. in the decision icon) any non-zero number is converted to "true" and zero is converted to "false". So "if (10 & 7)" becomes "if (2)" which becomes "if (true)".

But "if (10 & 5)" becomes "if (0)" which becomes "if (false)".

But Leigh is correct - there are lots of better explanations elsewhere on the internet!

This one is very good, which explains its top ranking
https://www.tutorialspoint.com/cprogram ... rators.htm

Thank you Leigh. As Steve said Google it ,I am in full speed and begin to understand

I will have a look at your link, thank you and have a nice weekend.

Br Jorgen