help me

fix error…?? help

Post code and full error message

ielhamzgmr: fix error...?? help

Declare a function called A in scope.

Edit: Or a macro.

And B(), C(), etc as you are likely going to have the same issue with the following lines...

Don’t post screenshots of text! That is very unhelpful. When you encounter an error you’ll see a button on the right side of the orange bar “Copy error messages”. Click that button. Paste the error in a message here USING CODE TAGS (</> button on the toolbar). It is almost never appropriate to post screenshots but in some rare cases it is helpful to post images. You should attach and embed the image following these instructions:

Oddly my version of the Arduino IDE and compiler doesn't do optical character recognition so I couldn't compiler your sketch (and it was incomplete anyway).

Hi, Welcome to the forum.

Please read the first post in any forum entitled how to use this forum. http://forum.arduino.cc/index.php/topic,148850.0.html then look down to item #7 about how to post your code. It will be formatted in a scrolling window that makes it easier to read.

Can you tell us your electronics, programming, Arduino, hardware experience?

Can you tell us what your code is supposed to do?

Is English you native language?

Tom... :)

J-M-L: And B(), C(), etc as you are likely going to have the same issue with the following lines...

I'd change the names. Single capital letters are often defined macros and can get you some really weird errors.