What are digital pin numbers?

I an exaple i found this at beginning:

const int RED_PIN = 9;
const int GREEN_PIN = 10;
const int BLUE_PIN = 11;

I have a this breadboard:

Where are pin 9,10,11

How do i know which pins are where, i just see a3, j8 etc. etc.

They are pin numbers on the arduino board, not on a breadboard unless YOU make a connection. The marking on a arduino board is usually very clear

Is this a joke ? The variables you mentioned are for RGB LEDS and the pin numbers are arduino digital output pins. (that drive those color leds). Next time you post code, post the ENTIRE CODE . they have NOTHING to do with a breadboard. This is a joke , right ?

Checks dateā€¦ nope, not April 1

Edit: Sorry about that: forum software insisted I say something even though all I really wanted was to add the picture.

ArduinoUno_R3_Front_450px.jpg

raschemmel: Is this a joke ? The variables you mentioned are for RGB LEDS and the pin numbers are arduino digital output pins. (that drive those color leds). Next time you post code, post the ENTIRE CODE . they have NOTHING to do with a breadboard. This is a joke , right ?

Checks date.... nope, not April 1

Really sorry, i thing this form is not for newbie, Do you know a newbie forum?

Of course it's a newbie forum. I think we were all just astonished that even if you've only had your Arduino a day or so, that you didn't see the numbers on the Uno. Sorry if that offended you......

Think logically: even if the Uno had no numbers marked, how could pin numbers in a sketch possibly relate to some arbitrary external breadboard which has nothing specific to do with Arduino?

The Red ,Green , Blue was a clue.

i thing this form is not for newbie, Do you know a newbie forum?

There's Newbie, and there's NEWBIE !

Is this a joke ?

It was just a question.

I thought is was someone just having some fun with us for a laugh.

Think logically: even if the Uno had no numbers marked, how could pin numbers in a sketch possibly relate to some arbitrary external breadboard which has nothing specific to do with Arduino?

thank you

Welcome to the forum. Lots here are ready to help with your questions.