1.  03/11/2005, 06:44 PM I entered the following: 10 + 8% = ...and the answer I get is 0.18 Well, when I enter the exact same thing on my Treo 600 I get 10.8 as the answer...seems better, right? So I tried the calculator on my iPAQ and got 10.8 as well. the I pulled out the TI-83 from a few years ago in statistics. I got 10.8. Oddly enough, even when I do it by hand, I get 10.8. So why can't the Treo 650 do this correctly? It gets worse. I switched to the advanced mode and did the calculation on the 650 and got 10.64. So, I suggest that those of you who use your calculators look into something other than what comes bundled, because I sure as hell wouldn't trust it.
2.  03/11/2005, 06:53 PM Not a mathmatician - but I think it has to do with the fact your question doesn't have enough data. 8% of what? The 650 assumes you mean 10% + 8% and thus gives you 18%
3.  03/11/2005, 07:12 PM LOL well I tried it on my Sony Clie NX-80 and a few other calcs I have laying around. Your right. The 650 gives a different result then the rest. Wierd Should note. It does give the correct result if you enter a percent as a decimal and avoid using the percentage key.
4.  03/11/2005, 07:18 PM Ok, sorry... I simplified the numbers from those that I initially used, and recalculated using the small numbers 10 and 8% (of ten). If I want to find out what the sales tax is that I should be paying on an item I type into the Treo 650 the following: 10 + 8% = This stands for ten dollars, plus 8 percent of ten dollars. I then hit the "equals" key to tell it to calculate. This works properly on every other calculator I have tried, but not on the 650's calculator. The item I was actually doing this for actually cost me \$429. With sales tax at 8% it cost \$463.32. Correct me if you think I'm wrong. The Treo 650 is coming up with \$4.37. No typo there either. Either this calculator requires a different way to input this information, or it is not accurate.
5.  03/11/2005, 07:24 PM I see what your doing - as I am unfamiliar with the language Treo uses hard to say. Why not just to "10 x .08" and that will give you the tax. Either way - it is kinda odd that they give different interpretations.
6.  03/11/2005, 07:25 PM I think I agree with both posters here. The key sequence "10 + 8 %" is ambiguous and open to interpretation. However, the standard interpretation (at least on the 4 non-RPN calculators I could find in my house) seems to be 10 + (.08 * 10)
7.  03/11/2005, 07:26 PM It seems clear that what it actually did is first add 10 and 8 and then divide by 100 (the "%" key), which makes perfect sense for this calculator. Try this: 10 + 8 X. 01. The result is .18, though of course it really should be 10.08 if normal math rules of precedence were applied, doing the multiplication first, then the addition. Note that if you do the same thing in "advanced" mode you get 10.08 as the result! Obviously, in "basic" mode the operations are all done as you go, while in "advanced" mode normal rules of math apply.
8.  03/11/2005, 10:43 PM So is this something we can add to the Treo 650's already long list of "shortcomings"?
9.  03/11/2005, 11:58 PM Originally Posted by IsLNdbOi So is this something we can add to the Treo 650's already long list of "shortcomings"? Nope. This is not a shortcoming. This is more like "operator error." 10 + 8% is an incorrect way to figure out 8% tax. Try 10 X 1.08. Simple, eh? Frannkly, no calculator should have a "%" key as its operation is confusing and the way it works is not universal.
10.  03/12/2005, 12:04 AM Originally Posted by westronic Nope. This is not a shortcoming. This is more like "operator error." 10 + 8% is an incorrect way to figure out 8% tax. Try 10 X 1.08. Simple, eh? Frannkly, no calculator should have a "%" key as its operation is confusing and the way it works is not universal. I'm talking about what the original poster said: 10 + 8% = ...and the answer I get is 0.18 I use the % button alot and if the Treo650 doesn't give the correct answer when you use x + y%, then it's not working correctly, thus another "shortcoming".
11.  03/12/2005, 12:47 AM You can't really say it gives the wrong answer when the function of the key is not documented. It obviously is not the answer you expected, and it may not be the same as other implementations, but as has been pointed out, it is a valid answer given strict left-to-right operation hierarchy. Palm Pilot Personal -> Palm III -> Palm IIIx -> Visor Prism -> Clie TJ37 -> Treo 650 -> GSM Centro