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Why jExacter

Witold Kossowski, 2009

jExacter, written in Java, is an application of high precision calculus.

*** The precision is adjustable within the limit of 1 - 240 significant digits (30 by default).

*** The user can choose a System Keyboard (48 standard functions) as well as the Private one (with 48 customizable keys, see Read Me).

*** Every "private" button can be titled and linked to any formula entered by the operator at any moment and for permanent using.

*** Calculation is carried out starting from the formula of the length limited to 248 characters.

*** The formula, written in natural notation, is built of operators (max.73), constants and variables.

*** The syntax of the formula is verified and all error is interpreted.

*** The compilation of the formula is followed by the optimization of the calculus.

*** Incremental (for any number of variables with different incrementation values ) as well as recurrent calculus are possible.

*** The formula, as well as any argument can be modified by the user at any moment.

*** jExacter makes the direct access to any variable.

*** Any argument can be entered in fixed or scientific format.

*** In the case of periodic number, the use of the parentheses is authorized, e.g. 1,0(53) that corresponds to 1,053535353… .

*** Every entered argument is tested and all error is interpreted.

*** The largest/smallest accepted number is 1e1.000.000.000.

*** "Infinity", "NaN" (Not a Number), "TLN" (Too Large Number, i.e. a number > 1e+ and inferior to Infinity) can be entered and displayed as a result and correctly treated as an itermediate result in any context.

*** There are two predefined values, e and pi.

*** The operator has a direct access to the Help file which, among others, contains the presentation of all functions. The access to the Help file is free at any moment, and one can add his own remarks to the text.

*** The operator has at his disposal another editable system file called FORMULA FILE ("formfile"), as well as the file CONSTANTS where any constant (with or without its name and possible comments) may be registered.

*** According to the run mode chosen, the calculation may be followed by a Report containing a list of arguments and all intermediate results in chronological order.

*** A Find function was added to the Report window, as the report might be very large, especially in the case of the list of primes in some range (exemple : pra[0;10000000] gives all primes from 0 to 10 millions, e.g. 664579 primes organized in 65033 report lines).

*** Every file controlled by jExacter can be printed directly from the File menu.

*** The formula, the arguments, the result, the precision level as well as the report never disappear from the screen. When moving from one window to another, the window colors change, so the user is never lost in his action.

*** In the set of operators, one can find a division modulo as the rest of division by a real number, nth root, a logarithm with any base, a product of all successive numbers of any range, number format conversion (between any bases in the range 2...16), liste of all primes from the range[a..b], nth prime, etc.

*** The use of a special variable name "me" (memory) is authorized. The operator enters the value of "me" before the first run, and at every successive execution "me" takes the value of the last result. This enables the recursive computation.

*** Besides, jExacter has a simple and direct mode of calculation called CASH REGISTER that enables a continuous addition of numbers, products, percents and divisions (precision limited to 25 digits) with the control of the syntax of arguments and operations.

*** Supports copy / paste / cut / Save As / etc.

*** The execution time is measured and displayed.




divdivision (no remainder)
moddivision modulo
gcdgreatest common divisor
absabsolute value
intinteger part
inr the nearest integer
dec fractional part
! factorial
pro product from ... thru ...

max max. of 2 numbers
min min. of 2 numbers
mo increment
bas conversion of the base-n to the base-m in the range [2..16]

r nth root
r2 square root
ln natural logarithm
lg2 binary logarithm
log decimal logarithm
lg any base logarithm

rd degrees => radians
deg radians => degrees
sn sine
cn cosine
tg tangent
cg cotangent
asn anti-sine
acn anti-cosine
atg anti-tangent
acg anti-cotangent

sh hyperbolic sine
ch hyperbolic cosine
ht hyperbolic tangent
hc hyperbolic cotangent
ash hyperbolic anti-sine
ach hyperbolic anti-cosine
aht hyperbolic anti-tangent
ahc hyperbolic anti-cotangent


pra list of all primes from the range [n..m]
prn value of nth prime number
prx prime number nearest to x, x : real
pr1 Is number "i" a prime ? (otherwise the list of all prime divisors)
pr2 list of all common prime divisors of two numbers 




Warranty This software is offered "as is" without warranty of any kind. In no event shall the author be liable for incidental or consequential damages, including but not limited to loss of use, loss of revenue or profit, loss of data or data being rendered inaccurate, or losses sustained by third parties even if the authors have been advised of the possibilities of such damages.


Technical Support Sorry, no support or help is available, but please send any comments or "bug" reports via email to: