Re: Arduino HP-25 Simulator

[Paul Dale]

Changing the processor is unlikely to make a difference. The C types float and double don't change -- they are generally IEEE 754 binary reals. The performance will vary but not the accuracy.

Calculators use decimal arithmetic, you need a decimal big number library or an arbitrary precision floating point library. Or, as Tony mentioned, a emulation of HP's firmware.

If you want some code to lift, try the WP 34S project which has a pretty reasonable decimal floating point library. It is also quite accurate and requires little RAM but it isn't fast.


Pauli

[disclaimer: I authored most of the WP 34S mathematical code, so I might be slightly biassed]