Manpage of SPAR
Section: User Commands (1)
Updated: 26 Jun 2001
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spar - a modular console calculator
spar [options] [--] expression
Spar is a console calculator, primarily intended for problem
solving in arbitrary precision. It supports also modules (aka code that can be
loaded dynamically) and a number of other features, such as: user variables,
functions, and constants.
- -d, --decimals
Set the decimal precision (number of digits printed after the point).
- -i, --integers
Set the integer precision (number of digits printed before the point).
- -c, --config
Use a user-defined modules configuration file.
- -q, --quiet
Don't display the welcome message.
- -h, --help
Display usage information and exit.
- -v, --version
Print version information and exit.
Terminate option list: now all arguments is interpreted as an expression to
The most basic element in spar is the number. Numbers are
double precision numbers. All numbers are represented internally
as a standard C double variable. There are no attributes of numbers,
but the precision can affect the number output. This precision is both in the integer part and the decimal part.
The number 0.123456789 is represented internally as a double precision
variable, but if we change the precision, the output will change:
0.123456789 = 0.123457
Numbers can be stored in named variables. Variable names begin with a letter
followed by any number of letters, digits and underscores. The variable names
are case sensitive. Variables may have values assigned to them
as well as used in expressions and it contains a special data member that stores
the "previous" value".
To declare a variable you must supply both a name and a value. Any undeclared
variable generate an error.
For example, to
declare the variable i of value 5 enter:
- i = 5
Constants are special variables that is read-only. This means that you can
read a constant value but you can modify. There is a number of "preloaded"
variables such as "e", "pi" ecc.
spar support a number of often used scientific functions (directly from
The Spar Library). For example, to get the value of the natural logarithm
in 0 enter:
These are the familiar `sin', `cos', and `tan' functions. The
arguments to all of these functions are in units of radians; recall
that pi radians equals 180 degrees.
Inverse Trig Functions
These are the usual arc sine, arc cosine and arc tangent functions,
which are the inverses of the sine, cosine and tangent functions
Exponents and Logarithms
These are the 'exp' group, 'log' group, 'pow' group and 'sqrt' group.
sinh, cosh, tanh. The functions in this section are related to the exponential
Inverse Hyperbolic Functions
asinh, acosh, atanh. The functions in this section are related to the Hyperbolicfunctions.
isnan, finite, isinf.
Factorial, sum, and other specific spar functions.
The numbers are manipulated by expressions and statements. Since
the math parser was implemented to be interactive, statements and expressions
are executed as soon as possible.
A simple expression is just a constant. spar displays constants
using the current precision (see OPTIONS). Full expressions are similar
to many other high level languages. Since there is only one kind of number,
there are no rules for mixing types.
In the following descriptions of legal expressions, "expr" refers to a
complete expression and "var" refers to a simple variable.
- - expr
The result is the negation of the expression.
- expr + expr
The result of the expression is the sum of the two expressions.
- expr - expr
The result of the expression is the difference of the two expressions.
- expr * expr
The result of the expression is the product of the two expressions.
- expr / expr
The result of the expression is the quotient of the two expressions.
- expr % expr
The result of the expression is the "remainder" and it is computed in the
- expr ^ expr
The result of the expression is the value of the first raised to the
- ( expr )
This alters the standard precedence to force the evaluation of the
- var = expr
The variable is assigned the value of the expression.
This prints variable value's: note that "var" could be also a constant.
Print a brief commands notice. If a command name is supplied print a detailed
Print a longer warranty notice. No arguments.
Add a comment to a variable. At least two arguments.
Print the built-in constants table. No arguments.
Print the built-in functions table. No arguments.
Print the all loaded modules. No arguments.
Swap the current variable value with the old one. One argument.
Run a module. Note that you must supply a valid module name otherwise, the
list of the loaded modules is printed.
Print all user variables.
Spar supports terminal features (termios) to allow the program to be more
user-friendly and also more robust.
Spar can be compiled (via configure script) to use the
GNU readline input editor library. This allows the user
to do more editing of lines before sending them to spar.
It also allows for a history of previous lines typed: the history
can be viewed by '' key, whereas the readline auto-completion was
implemented by the TAB key. For more information, read the
user manuals for the GNU readline and history libraries.
Instead the key '!' run the last command and, finally the key ':' can be used
to display a specific history item. For example: ':1' shows the first history
During a session, the SIGINT signal (usually generated by the control-C
character from the terminal), SIGSTP signal (usually generated by the
control-Z character from the terminal) and SIGTERM signal will cause
execution to be interrupted. After all run-time structures have been cleaned up,
a message will be printed to notify the user that spar is aborted.
All variables and modules are removed during the clean up process.
The control key EOF is inhibited. spar restore this setting on exit.
The best way to submit a bug report for Spar is to use the file BUG-REPORT,
that will enable me to fix the problem. Please visit the Spar homepages at:
http://spar.sourceforge.net/index.html (main site)
for the latest version, patches and documentation.
/usr/local/lib/libspar.so Spar Library
/usr/local/include/spar/* Spar Headers
/usr/local/lib/spar/* Spar modules
/usr/local/share/spar/modules_config Spar modules config
The author would like to thank Sebastian Ritterbusch (Rascal@Ritterbusch.de) for
his extensive help in testing the program and the documentation. Many great
suggestions were given. Please visit his website http://rascal.sourceforge.net
or the sourceforge project at http://sourceforge.net/projects/rascal.
bc(1) An arbitrary precision calculator language
Spar can be used also as library, a API reference can be founded via web at
http://sourceforge.net/projects/spar. Please help me to extend and correct it.
- Trig Functions
- Inverse Trig Functions
- Exponents and Logarithms
- Hyperbolic Functions
- Inverse Hyperbolic Functions
- Infinite Functions
- Special Functions
- READLINE OPTION
- SIGNALS SUPPORT
- TERMCAP SUPPORT
- SEE ALSO
This document was created by
using the manual pages.
Time: 13:35:11 GMT, June 26, 2001