I tried (2 / 3) * 3 - 2 on my Casio FX-180P [1] (now almost 40 years old!) and on Android Realcalc [2] (which mimics a very similar calculator) and I got 0 on b

I tried (2 / 3) * 3 - 2 on my Casio FX-180P [1] (now almost 40 years old!) and on Android Realcalc [2] (which mimics a very similar calculator) and I got 0 on both. Same with sqrt(6)^2 - 6 - 0 on both. (-1)^5 works fine too. So full marks for the ancient Casio and its emulator on the initial quality tests! [1] https://www.calculator.org/calculators/Casio_fx-180P.html https://www.calculator.org/calculators/Casio_fx-180P.html [2] https://play.google.com/store/apps/details?id=uk.co.nickfines.RealCalc&hl=en&gl=US https://play.google.com/store/apps/details?id=uk.co.nickfine... Note that [1] claims the calculator came out in 1985 but I'm sure I got mine in 1983 or 1984