First impressions on Casio FX-5800P

[Eddie W. Shore]

Due to the lack of modulo (MOD) and signum (SIGN) functions on the fx-5800P, here are several subroutines to help compensate for it:

SIGN(x): // x is any calculation stored in a variable
...
x > 0 ⇒ 1 → x :
-x > 0 ⇒ -1 → x:
....

n MOD d :
...
numerator → N
denominator → D
Frac(Abs(N ÷ D)) × D
...

Alternative (better way for MOD):

N - D Intg(N ÷ D)