Code question - Use of //

MichelB

Hi specialists of code. In NewDistanceFollowingWithAverageAndDeadband.bs2 (Andy Lindsay) we can find:
...
Elements·· CON·· 4
...
'

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{ Subroutine - Get IR Distances }

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Get_IR_Distances:

index = index + 1
index = index // Elements (or index = index // 4)

If it was a beginner writting the 2 last lines how it should be?
Something with IF... THEN, ENDIF, but what?
Thank you.
Best regards

Mike Green

The "//" operator gives you the remainder from a division. In the case of "index = index // Elements", you divide "index" by "Elements" and use the remainder as the result. If "Elements" is 4 like in the comment to the right ("or index = index // 4"), you'd get the following for results:

index     index//4
   0           0
   1           1
   2           2
   3           3
   4           0

This has the effect of index "wrapping around" at Elements. It's not exactly the same, but these two statements could be rewritten as:

index =  index + 1
if index = Elements then index = 0

MichelB

OK Mike, well understood, thank you.