Usually two functions can be seen on an Arduino code

• main

  • The main function runs at first when the board is powered up, or after RESET.

• loop

  • The loop function runs repeatedly or untill a certain condition is met.

Arduino uses a C++ like syntax.

Which is pretty similar to C language.

The main difference is that C++ supports classes, and methods while C does not.

This makes C++ support OOP (Object Oriented Programming), which Arduino also does.

In C language we have data structures.

For the moment think as C++ supports having functions inside a structure.

In Arduino codes, we will see for example Serial.println("Hello World"); here println is a function or what we call a method in Serial.

We will be using such commands which might at first look confusing, but will get very familiar very soon.