DB48X: HP48-like RPL implementation for DM42

[c3d]

(Yesterday 09:47 PM)battlecoder Wrote:  

(Yesterday 05:07 PM)n1msr Wrote:  I did wonder if there is a setting I could make in the DB48X calculator to change the way the functions behave, i.e. accept Real Numbers as well as, or instead of Real Integers?

This is an interesting problem. I've not used the DB48X much (yet! waiting for a DM42n and overlay to arrive) but it could be implemented like some programming languages do; If a function expects a parameter of type T, but a parameter of type P is supplied, it would check if there's an straightforward conversion from P->T, and apply it automatically to the input.

RPL is a highly polymorphic language, where the exact conversions that are allowed are really per command, and not really consistent across HP models.

So in that context, any kind of implicit conversion is practically out of the question. This is even more true for conversions that would lose value, like decimal to integer. FIX, for example, accepts 2.3 as input, and truncates it to 2. FACT, on the other hand, does not truncate fractional input, and clearly should not.