Question about arguments in Serial.print()

Projects Programming
1

Hello, I'm using a code for RC522 and I've found this line:

Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");

The program works correctly but I'd like to know what exactly does this line.

I've found that it takes a byte from a string like "803C2933" and make it like "80 3C 29 33" but I don't know why.

"80" > "80 "
"3C" > "3C "
...

Could anybody help me? Thanks in advance.

2

Hi pevire. Read about the ternary (or conditional) operator "?" here: HERE.

3

Thank you, doubt solved.

I'm learning all by myself and this is something that I haven't found in the basic documentation of arduino.

Thanks again.

4

There's not much to the Arduino docs. It just describes the basics and the custom library stuff added by Arduino like digitalRead and digitalWrite. If you want a real reference then forget the word Arduino and look instead at the programming language it uses. It's called C++.