Casio FX602P vs fx4000P, different results

10272021, 07:33 PM
Post: #2




RE: Casio FX602P vs fx4000P, different results
Both calculators evaluate results to 12 significant figures: \(\sqrt{2}\approx 1.414\,213\,562\,37\). Squaring this number gives 2, to 10 significant figures. This is what is displayed on the FX602P.
However, pressing the EXE key on the FX4000P rounds the result to 10 significant figures: \(\sqrt{2}\approx 1.414\,213\,562\). Squaring this rounded number gives \(1.999\,999\,999\), to 10 significant figures. The rounding happens, I guess, because registers on the FX4000P only store 10 significant figures. Pressing EXE stores the displayed number into the Ans register, hence the rounding. There is no Ans register on the FX602P, and in any case the FX602P's registers store all 12 digits of a calculated result. Typing \((\sqrt{2})^2\) EXE on the FX4000P gives an answer of 2, as the rounding doesn't occur until the calculation is complete. Incidentally, the answer on the FX602P is not exactly correct. Squaring \(1.414\,213\,562\,37\) gives \(1.999\,999\,999\,99\), rounded to 12 significant figures. The FX602P rounds the answer to 2, exactly. Quite a lot of Casio calculators do this  personally, I disapprove! Nigel (UK) 

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