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pito · (This post was last modified: 06-08-2014 01:52 PM by pito.)

A friend of mine has advised me today there is following quick precision test when testing better calculators in the shop:

Take 1.0000001 and do x^2 27times..

Windows calculator (most probably using at least 34digits decimal fp) gives me:
674530.4707410845593826891780296

Wp34s emulator shows:
674530.47054

It seems to me all the relevant digits in this test fits into 39digits standard precision the wp34s uses. Why the diff then?

UPDATE:
Basic precision:

Code:

Calculator        Display           Display-INT           Note

=======================================================================

W.Alfa (Ref)      674530.470741     .4707410845           The reference

-----------------------------------------------------------------------

Citizen SRP-325G  674530.4707411                          ? basic precision, web source

Citizen SRP-400G  674530.4707411                          ? basic precision, web source

Canon X Mk I Pro  674530.4707       .4707399243

Casio CPad300Plus 674530.4706                             web source

WP-34s            674530.47054      .4705396874

WP-31s            674530.47054      .4705396874

Canon F-715SG     674530.4702       .470205499

Olympia LCD-8110  674530.4702       .470205499

Ti-80             674530.318        .3180426

TI-83 Plus Silver 674529.4131                             web source

Ti-89             674529.413051     .41305068

TI-92 Plus        674529.413051                           web source

Casio fx-9860     674529.1121                             web source

Casio FX-6910AG   674529.1097                             web source

Sharp EL-W506X    674523.3747       .3747398

SR-52             674520.6053                             web source

TI-59             674520.6053                             web source

HP-50g            674514.86877      .86877

HP-35s            674514.86877      .86877

HP-39GII          674514.86877                            web source

HP Prime          674514.86877                            web source

HP-49g            674514.86877                            web source

HP-30b            674514.86877                            web source

Sigma GC 500      674512.576        .576

Casio FX-602p     674494.0561                             web source

HP-25             674494.05         .0561

Anitech SC100     674492.7511       .75112

Casio fx-3650P    674475.4416                             web source

Casio FX-702p     674475.3961                             web source

Casio fx-991MS    674472.4416       .441611

TI-57             674432.82                               web source

Truly SC106A      674294.1172       .1172

Casio FX-502p     674185.8477                             web source