The fact that the Arduino IDE simplifies things with setup() and loop() does not mean that an Uno can only use that type of program. Under the hood the Arduino IDE provides the other stuff to make your sketch into a standard C/C++ program.
The fact that the Arduino IDE simplifies things with setup() and loop() does not mean that an Uno can only use that type of program. Under the hood the Arduino IDE provides the other stuff to make your sketch into a standard C/C++ program.