WP34S x=? in integer mode  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: WP34S x=? in integer mode (/thread214140.html) 
WP34S x=? in integer mode  Harald  03132012 I have written a little program to "benchmark" a few of my calculators. It simply adds all the integers from the start value down to 1. I am using x=0? to determin when to stop. According to the manual I should use x=+0? or x=0?, but haven't tried that yet (forgot the calculator at home)
Cheers,
Edited: 13 Mar 2012, 9:48 a.m.
Re: WP34S x=? in integer mode  Dominic Richens  03132012 notwithstanding what the manual says about x=0 and x=+0, x=0? should still work as expected in integer mode.
Not only does 75 x=0? return true, 0 x=0? returns false!
Re: WP34S x=? in integer mode  Walter B  03132012 Good find :) Strange things happening there: 16 x=0? returns (correctly) false, so what's happening in between? We'll look into that. Thanks for reporting!
Re: WP34S x=? in integer mode  Marcus von Cube, Germany  03132012 I have an idea where to look but I need time to investigate it.
Re: WP34S x=? in integer mode  Paul Dale  03132012 Fix committed but not built. This was a result of the rearrangement of the internal constants table recently. There was a second bug where the integer test against 1 was really against 1 :( You only need to use x=+0? and x=0? in special occasions and if you don't know or understand when, you don't need to use them :) Just use x=0? instead.
Re: WP34S x=? in integer mode  Harald  03132012 Quote:So basically you are saying they are only interesting if I am using ones' complement because then I have both +0 and 0? But x=0? should be true for both +0 and 0? Re: WP34S x=? in integer mode  Paul Dale  03132012 Quote: That is a third of the ways negative zero can appear. The sign & mantissa integer mode also has positive and negative zero. This isn't really any different to the 1s complement mode however. Real numbers have positive and negative zeros, which is invaluable for numerical programming. You'll have to set flag D to see the difference. And yes, x=0? is true for both positive and negative zero.
Re: WP34S x=? in integer mode  Harald  03132012 Quote: I never thought about that, but I suppose it helps to know which side you are approaching a limit from.
Quote:Ok, thanks for the info!
Harald
Re: WP34S x=? in integer mode  Paul Dale  03132012 Quote: Exactly. Very useful for complex branch cuts e.g.
