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I have just release version 5.0.3 of Office Calculator Pro.
In this version I tried to make the licence check a bit more robust.
And you can check the licence state at the very end of the about dialog.
This version became necessary because of some although very rare reports of licence errors. See FAQ #19 (https://plus.google.com/u/0/b/102722080857874903362/+TaobitsNet/posts/J3jfoRGduWL)
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Office Calculator

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I just sponsored a review of Office Calculator at androidheadlines, see http://www.androidheadlines.com/2014/12/sponsored-app-review-office-calculator-free.html
It always feels so nice, when other people appreciate your work.
Description: Office Calculator for Android is yes, another calculator application, however it's designed specifically for those that work with numbers all
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Christof Vollrath's profile photoJose  Benedito's profile photo
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Road Map for Office Calculator (short term)

- Multiple tax rates
- Add subtotal line before +TX
- Make size of tape lines configurable
- Height of buttons configurable (in percentage of default size)
- Lock screen widget
- Support multi window (on devices which have this feature)
- More function keys (basic mathematics 1/x, x2, pi etc)
- Optionally disable sleep when the calculator is active
- Repeat last operation when pressing "=" button again.

This list sorted in any way, it  is not prioritized and garanties no temporal.

See also the Long Term Road Map https://plus.google.com/u/0/b/102722080857874903362/+TaobitsNet/posts/Y6hdvGeQ1wD
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I've just released a bug fix release 5.0.2 for Office Calculator Free which saves the swipe position of the function buttons more reliable.
When you have swiped through the function buttons to see the memory button, this position will be restored when you restart the calculator later. Please keep in mind that due to the different keypad layout in landscape and portrait orientation the function key position is stored separately.

I've just released it for the free variant, Office Calculator Pro and the Amazon variants will be released tomorrow.
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Office Calculator's profile photoChristof Vollrath's profile photo
 
Just released bug fix release 5.0.2 for Office Calculator Pro on Google Play and both Free and Pro variants on Amazon App Store.
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Office Calculator FAQ #17

Should 1 + 2 * 3 result to 9 or 7?

My Office Calculator can calculate with operator precedence or without it.
This can be controlled in Menu /Settings /Artithmetic Operations /Order of Operations, with "Standard" meaning multiplication over addition and "Normal" meaning no order.
Depending on these settings the simple expression 1 + 2 * 3 will have different results.
Without operator precedence it will result to 9 (1 + 2 = 3 and 3 * 3 = 9)
With operator precedence it will first calculate the multiplication (2 * 3 = 6) and then the addition ( 1 + 6 = 7).
By the way, you will always see the current interim result in the display as a grey value.
And when order of operation is applied the interim result will be displayed on the virtual tape.
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Does the new Office Caluclator icon really look like Windows 95?
I've got several critics for my new icon. The most hurting one was that it reminds of old Windows 95 icons. In fact I have never thought about it. But when you look at the icons, a similarity can't be denied. Maybe I should claim that I made a courageous retro design decision - I'm not so sure.
Nevertheless I like the new icon much more than the old one. There are so many different calculators on Google Play and the new icon makes it very clear what to expect form my Office Calculator, an app to replace your desktop device. And it really works, with the new icons downloads doubled. Thanks to everybody who is trying out my calculator.
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Justin Barrett's profile photoChristof Vollrath's profile photo
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+Justin Barrett Thank you for the encouragement.  What I did not like about the old icon was just it's resemblance to iPhone icons from the time of the iPhone 3G. This was an embarassing time when Android was still in the shadow of the iPhone and a lot of app programmers tried to make there app look like on the iPhone, the same was true for me. But now, Android has got it's own design language and I hat to get away from the old icon.
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Office Calculator

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Today my Office Calculator app crossed the one million downloads mark https://play.google.com/store/apps/details?id=net.taobits.officecalculator.android
Büro-Taschenrechner mit virtuellem Kontrollstreifen für Android, Festkomma-...
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Office Calculator FAQ #20

How can I print the tape?

Currently you can't print directly from the Office Calculator.
But there is a workaround, another app can be used for printing when you copy the content of the tape to it.
Here is a step by step guide:
Copy the content of the scrolling tape by doing a long press on the tape and select "Copy Tape" from the menu.
Then open another app, e.g. Docs from Google, create a new document.
Paste the content of the tape to this document by doing a long press and selecting "Paste".
Now you can print through Google Cloud Print by selecting Menu/Share&Export/Print or you can call another printing application like PrintHand by selecting Menu/Share&Export/Send a Copy
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Office Calculator FAQ #19

I'am getting a banner saying that the license ist not valid.  Why do I get it and how can I avoid it?

Supposing that you have bought my Office Calculator Pro (and that you are not trying to install a pirated version), there are two common causes: you might have changed the Google Account to which the phone is licensed or you have an ad blocker installed which blocks accidentally the licensing service.

(1) Wrong Google Account
If you buy something on Google Play, your license is connected to your Google Account.
In the case that you really needed to change your account, you could also add the former account to your phone, so that you can still use the apps, that you have bought with your former account.

(2) Ad Blocker
Some ad blocker seem also to block the validation request, which is send to Google Play to check if the app is licensed.
Sorry for this inconveniences but in this case the ad blocker is to be blamed, I am using exactly the licensing check as it is recommended by Google.
In this case it might help, if you clear the cache of Google Play Store.
You can do this by following these steps:
1. Uninstall Office Calculator
2. Clear data and clear cache of Google Play Store
   a) Got to settings
   b) Tap on apps
   c) Select Google Play Store
   d) Clear data
   e) Clear cache
3. Reinstall Office Calculator
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Fernando Ossandon's profile photoOffice Calculator's profile photo
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Are you sure, that you cleared the cache of Google Play?
This is weired, because Google Play does the licensing check, and if you download an app through Google Play, it should know, that the app is licensed.
I just released the new version 5.0.3 of Office Calculator Pro, where I made the licensing check a bit more robust and where the result of the check is displayed at the end of the about dialog.
Can you please update to the new version and check the licensing status in the about dialog.
You might also send me the result by mail to android@taobits.net
Thank you very much for your help.
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Office Calculator

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Road Map for Office Calculator (long term)

- Rounding Behaviour (always, before addition, on result)
- Grand Total of tape
- More corrections on tape
- Paste expressions like (6+4)+3+22+4+4+(2+2)+(2+2)+6=
- Export tape to different formats (e.g. Google Sheet)
- Save and Restore Tape
- Print Tape
- Archive for tape contents
- Currency conversion

This list sorted in any way, it  is not prioritized and garanties no temporal.
See also the Short Term Road Map (https://plus.google.com/u/0/b/102722080857874903362/+TaobitsNet/posts/AttPjf8WvnH)
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Office Calculator's profile photoKonrád Lőrinczi's profile photoChristof Vollrath's profile photo
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Great! I tried and works well! Good job! 
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Office Calculator

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Office Calculator FAQ #18

The [=] and [%] buttons are so close that I often tap on the wrong button. Can't you improve the keypad layout?

My Office Calculator has 3 different keypad layouts. When it is started for the first time on a device, it tries to select the optimal layout for your device size.
You can change the layout in the Menu /Settings /Input /Keypad Layout and select between "Compact", "Large Buttons" and "Extra Big Plus Button".
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Christof Vollrath's profile photoJim Thibault's profile photoErwin Narciso Galinato's profile photo
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200 x 0.04 is not hard to type in.
Some people have a use, me not so much.
To me it makes more sense if the bottom row was "%=" "="

Every calculation ends with an equal "=" 
If you are say in retail "%=" maybe every now and then.
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Just release the new Office Calculator Release 5.0.1 on Amazon App Store. Hope you like it.
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taobits.net Christof Vollrath Peter-Strasser-Weg 17 12101 Berlin Germany
Story
Tagline
Android Calculator optimized for office tasks
Introduction
Virtual tape calculator, fixed / floating point arithmetic, percent calculation.

Office calculator with a virtual tape,
fixed point or floating point calculator,
various rounding modes and percent calculation.
This is a calculator optimized for office tasks.