I wonder, is there a way to pass a variable's value on Arduino by reference, like in C++ ( say, int function(int &number) { ... } )
Essentially, I want to make a function that returns three different values to three separate variables. Return would work just for single variable. I tried to simply use "&" in arguments declaration list, but compiler wouldn't allow me
Sure enough I can group my variables in array, then function works on actual variable ( or rather memory address it's assigned to ) and not a copy and right now this is a solution I'm using. But nonetheless I would like to find out if there are alternatives available.
C does not have the concept of "reference" ala c++. Instead you can use a pointer. It's basically the same as a reference (the main differences being pointer arithmetic and initialization).
Here is a code snippet:
#include <stdio.h>
void my_func(int* a, int *b, int *c) {
 int temp = *a;
 *a = *b;
 *b = *c;
 *c = temp;
}
void main(void) {
 int i = 23;
 int j = 45;
 int k = 56;
 printf("i=%d, j=%d, k=%d\n", i, j, k);
 my_func(&i, &j, &k);
 printf("i=%d, j=%d, k=%d\n", i, j, k);
}
a pointer to an integer is declare like this:
int * my_pointer;
Two operators for pointer:
to dereference a pointer (the value of what is pointed by your pointer)
& to get a pointer to a variable
