TTCE: Tax, Tips and Currencies in Euro

Purposes

When you come from a country where the prices always include taxes, tips are banned, prices are expressed in another currency, and your bank will charge additional fee for the transaction, it is very difficult to have an idea of the price to be paid. This is especially true when several taxes apply (some of them also applying to taxes).
TTCE aims at quickly providing a raw estimate of the price to pay from the labelled price.
It can also retrocompute the tax, tip, change commission and exchange rate level (or retrocompute the price if you are looking for a fair price).
Additionally TTCE can split the bill in several parts
The rates can be stored in a database when they are clearly identified or recorded as the prefered values.

Beware: TTCE is provided as is. In particular it is not a financial or scientific calculator. Its purpose is to provide a raw estimate of the result. In no case, these results can be considered exact.

TTCE has been designed for being as intuitive as possible (see next paragraph for non intuitive aspects). You can either load it alone to your PalmOS running machine, or load as well the database for some predefined rates.

Caveats: I feel that there are four slightly non obvious things to understand:

• Tax(2) check box: when ticked require the second tax to be applied to the amount of the first tax as well as the initial amount;
• Commission computation: can have (only when entered in the database) a minimum amount that applies per operation. So, under the threshold of this amount the commission is that minimum amount, even if the initial amount is 0.
• Question mark: in three places in the interface a question mark is raised when TTCE has had to decrease the accuracy of the computations when faced with an overflow (note that in some other places the values are rounded). This should provide a reasonable result anyway.
• Overflow warning: it is raised when TTCE is not able to deal with the overflow. Usually it returns a value of 0. and the result of the computation is not accurate. This should not happen very often

As said above the computation does only provide raw estimates based on integer computation. But the computation scheme must be enough for many purposes. Here are the limitations of TTCE:

• Amounts and percentages are represented as an integer (the number of cents).
• Currency conversion rates must be expressible as x*10^m where x is between 0 and 0x7FFFFFFF and m is between 0 and -11.

The name TTCE stands for "Tax, tips and currencies in Euro" or "Toutes taxes comprises en Euro" (meaning "all taxes included in Euro").

Screen gallery

Copyright and legal notice

The software "TTCE" described by and downloadable from this web page, hereafter named "the software", is Copyright (C) 1998, 2000-2002, Jérôme Euzenat.
Some parts of it are Copyright (C) 1999, Alan Harder

The software can be downloaded, executed, copied, modified, free of charge under the express condition that this legal notice remains with it and that all the copyright statements remains clearly visible.

All express warranties and all implied warranties, including the warranties of merchantability and fitness for a particular purpose, of the software are disclaimed by the author.

The software is meant to be used by computer professionals able to evaluate the risks faced. The author is not liable for any damage whatsoever, direct or indirect, resulting from the use, reuse or performance of this software or its modified versions.

TTCE does only provide an idea of the amounts involved but not an accurate computation. It is thus non suitable for accountant or changing money. In particular, Euro conversions do not comply with EU rules.

By using the software, the user agrees to be bound by the terms of this notice. The author reserves the right to revise these terms at any time without notice by modifying the content of the present legal notice.

All company and product names may be trademarks of their respective owners and are gracefully acknowledged.

Download current version

Config	Size (ko)
ttce.prc	21
Sources	217

The previous versions can be downloaded from the history section, they are available in source format with the prc included.

Identifier

TTCE is registred with Palm under the TTCE, and TTCE Desk application under TTDA creator identifier.

Price

TTCE is freeware. If you like it, drop a mail to freeee À free . fr.

Bug notification

You can notify bugs and comments to freeee À free . fr. Please, for bug reports, provide the kind of machines, extensions (memory...), OS version and revision, hacks and circumstances (available memory).

Compatibility

TTCE should work on PalmOS 2.0 and above. It has been reported to work on:

Machine	OS	Language	Hacks
PilotPro+2Mo	3.3	US	no
PilotPro	2.0.4	FR	no
Palm m500	4.0	EN	no
POSE 3.5	4.0	EN	no
POSE 3.5	3.5	EN	no
POSE 3.5	2.0	EN	no
Tungsten T3	5.2.1	ML	no

History

Version	Comments
0.6.1 05/09/2002	Correction of doubled input keys (55)
0.6.0 02/09/2002	Beware new preference and database format Added bank commission management Added split and share feature Added date field in each record More rounding correction Developped a more precise currency rate computation (rate computation has been completely rewritten) Provided an initial database containing EURO conversion rates Some rewritting
0.5.0 19/08/2002	Color icon Corrected a bug on currency selection (rate reset to 1 when first list was selected) Corrected update of the rate when currencies have changed Corrected the update of newly created object indicator Revised navigation interface Added the checkbox for the second tax (indicating cumulative tax)
0.4.0 18/8/2002	Beware, new preference format Database storing and fetching of tax, tips and curencies New database and preference formats (with conversion) Compiled on MacOS X
0.3.0 5/3/2001	Unreleased version First non working database implementation Corrected URL in (i)
0.2.0 8/2/2001	Inital minimal working version (no database) Computation improved Bug in some field editing fixed Euro sign Corrected copyright Corrected "cancel" bug in editors Suppressed initial list values
0.1.0 18/01/2001	Unreleased version Navigation logic and calc function implemented

Todo list

• Solve the memory leaking coming from the fields (POSE detected)
• Desk accessory version
• Add a notion of configuration instead of simply tip, tax and currencies
• Import/export of databases
  The format would be:

           <ttce version="2" name="TipTaxCurrency">
             <currency name="EUR" value="1.00"/>
             <tip name="serv" value="15.00" chooser="222"/>
             <tax name="tva" onall="1" value="19.60"/>
             <commission name="mbank" min="0.75" value="2."/>
           </ttce>
  

  If you provide me with a lightweight analyser for this, I implement it right away.
• Version compatible with system 5

Software

TTCE has been compiled on Linux (RedHat 6.2) (resp. MacOS X 10.1.5) with:

• gcc for PalmOS
• prc-tools (2.1)
• pilrc 2.4 (2.9)
• PalmOS 2.0 SDK