Question

How many times does the setup() function run on every startup of the Arduino System?

(a) 1

(b) 2

(c) 3

(d) 4

I have been asked this question during an online interview.

My question comes from The setup() Function in chapter Arduino Programming of Arduino

Answer 1

The correct answer is (a) 1

For explanation I would say: The setup() function is used predominantly to configure the pins, variables, Serial data, etc. and is executed only once throughout the entire cycle of the program. However other than the above-mentioned uses, it can also be used to execute technically all aspects of an Arduino program, but since it only runs one time, it’s not very useful for anything other than configuring.