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[Reply #15 on:]

Yes your code works

Code:

void myProc (int& a, int& b) {
  a = 2;
  b = 7;
}

int myA = 0;  //Belt AND braces.
int myB = 0;

void setup () {
  myProc (myA, myB);
  Serial.begin (9600);
  Serial.println (myA);
  Serial.println (myB);
}

void loop () {
}

but this one doesn't

Code:

int myA = 0;  //Belt AND braces.
int myB = 0;

void setup () {
  myProc (myA, myB);
  Serial.begin (9600);
  Serial.println (myA);
  Serial.println (myB);
}

void loop () {
}

void myProc (int& a, int& b) {
  a = 2;
  b = 7;
}

The IDE does not generate a prototype for functions that use arguments with reference parameters.

see:
http://code.google.com/p/arduino/issues/detail?id=205
(please ignore that the OP of the google-code issue got the headline wrong)

Eberhard