Really simple NEWB questions... What are the { } for?

Projects Programming
40

Sorry to address your specific point - YES - Arduino ALWAYS requires setup(), as I just discovered! If you were compiling directly into GCC, you could use main(), and ignore the Arduino overheads.

SETUP ONLY
Works fine...

bool toggle;

void setup() {
 pinMode(13, OUTPUT);
 while(1) {
 toggle = !toggle;
 digitalWrite(13, toggle);
 delay(300); 
 }
}

LOOP ONLY
Oops! - I expected Arduino IDE would ignore the lack of a setup() function - just like it does for the lack of a loop()

bool toggle;

void setup(){ /* needed to satisfy the !Arduino! pre-processor*/ } 

void loop() {
 pinMode(13, OUTPUT);
 while(1) {
 toggle = !toggle;
 digitalWrite(13, toggle);
 delay(300); 
 }
}

Same for "Hello World" - or any other code you like
It's a bit odd the Arduino pre-compiler REQUIRES the setup(), but not the loop()