Easiest to understand way using a struct-ured variable with functions

[gfvalvo]

@StefanL38

myDataSet_t  myFunc(byte myInputVar) {
   myDataSet_t myLocalDataSet ;

  myLocalDataSet.myIntegerVar = myInputVar * 100;
  myLocalDataSet.myLongVar = myInputVar * 50000;
  myLocalDataSet.myShortName = "XY1234"; 

  return myLocalDataSet; 
 }

That will work. C++ can return a local struct variable. In this case, it will be done with a simple shallow copy. A struct with dynamically-allocated memory (an Arduino String variable for example) would require a proper copy (or move) constructor.

The (more efficient) alternative is to pass the struct variable FROM the calling function INTO myFunc() by using a C++ reference. myFunct() would then operate on that variable directly even though it "belongs" to the calling function.

The latter of these seems better to me.