Numworks - Question about frac()

[rkf]

Obviously, the implementations differ for negative arguments. Unfortunately, I'm unfamiliar with C, but who is, may have a look at the source of Numwork's frac here.

I guess Numwork uses floor C function, which gives -4 when applied to -3.95, and if you subtract -4 from -3.95, you are given 0.05?

Also I guess HP is simply truncating what's on the left hand side of the decimal point, so -0.95 is remaining. HP code aficionados know better for sure.

At the end of the day, mathematically speaking 0.05 and -0.95 are the same modulo 1. :-)