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2.12.3.1
calc/help/config
Landon Curt Noll b3648f030f Release calc version 2.12.2.2
2017-05-21 15:38:51 -07:00

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NAME
config - configuration parameters
SYNOPSIS
config(parameter [,value])
TYPES
parameter string
value int, string, config state
return config state
DESCRIPTION
The config() builtin affects how the calculator performs certain
operations. Among features that are controlled by these parameters
are the accuracy of some calculations, the displayed format of results,
the choice from possible alternative algorithms, and whether or not
debugging information is displayed. The parameters are
read or set using the "config" built-in function; they remain in effect
until their values are changed by a config or equivalent instruction.
The following parameters can be specified:
"all" all configuration values listed below
"trace" turns tracing features on or off
"display" sets number of digits in prints.
"epsilon" sets error value for transcendentals.
"maxprint" sets maximum number of elements printed.
"mode" sets printout mode.
"mode2" sets 2nd base printout mode.
"mul2" sets size for alternative multiply.
"sq2" sets size for alternative squaring.
"pow2" sets size for alternate powering.
"redc2" sets size for alternate REDC.
"tilde" enable/disable printing of the roundoff '~'
"tab" enable/disable printing of leading tabs
"quomod" sets rounding mode for quomod
"quo" sets rounding mode for //, default for quo
"mod" sets "rounding" mode for %, default for mod
"sqrt" sets rounding mode for sqrt
"appr" sets rounding mode for appr
"cfappr" sets rounding mode for cfappr
"cfsim" sets rounding mode for cfsim
"round" sets rounding mode for round and bround
"outround" sets rounding mode for printing of numbers
"leadzero" enables/disables printing of 0 as in 0.5
"fullzero" enables/disables padding zeros as in .5000
"maxscan" maximum number of scan errors before abort
"prompt" default interactive prompt
"more" default interactive multi-line input prompt
"blkmaxprint" number of block octets to print, 0 means all
"blkverbose" TRUE => print all lines, FALSE=>skip duplicates
"blkbase" block output base
"blkfmt" block output format
"calc_debug" controls internal calc debug information
"resource_debug" controls resource file debug information
"user_debug" for user defined debug information
"verbose_quit" TRUE => print message on empty quit or abort
"ctrl_d" The interactive meaning of ^D (Control D)
"program" Read-only calc program or shell script path
"basename" Read-only basename of the program value
"windows" Read-only indicator of MS windows
"cygwin" TRUE=>calc compiled with cygwin, Read-only
"compile_custom" TRUE=>calc was compiled with custom functions
"allow_custom" TRUE=>custom functions are enabled
"version" Read-only calc version
"baseb" bits in calculation base, a read-only value
"redecl_warn" TRUE => warn when redeclaring
"dupvar_warn" TRUE => warn when variable names collide
"hz" Read-only operating system tick rate or 0
The "all" config value allows one to save/restore the configuration
set of values. The return of:
config("all")
is a CONFIG type which may be used as the 2rd arg in a later call.
One may save, modify and restore the configuration state as follows:
oldstate = config("all")
...
config("tab", 0)
config("mod", 10)
...
config("all", oldstate)
This save/restore method is useful within functions.
It allows functions to control their configuration without impacting
the calling function.
There are two configuration state aliases that may be set. To
set the backward compatible standard configuration:
config("all", "oldstd")
The "oldstd" will restore the configuration to the default at startup.
A new configuration that some people prefer may be set by:
config("all", "newstd")
The "newstd" is not backward compatible with the historic
configuration. Even so, some people prefer this configuration
and place the config("all", "newstd") command in their CALCRC
startup files; newstd may also be established by invoking calc
with the flag -n.
The following are synonyms for true:
"on"
"true"
"t"
"yes"
"y"
"set"
"1"
any non-zero number
The following are synonyms for false:
"off"
"false"
"f"
"no"
"n"
"unset"
"0"
the number zero (0)
Examples of setting some parameters are:
config("mode", "exp"); exponential output
config("display", 50); 50 digits of output
epsilon(epsilon() / 8); 3 bits more accuracy
config("tilde", 0) disable roundoff tilde printing
config("tab", "off") disable leading tab printing
=-=
config("trace", bitflag)
When nonzero, the "trace" parameter activates one or more features
that may be useful for debugging. These features correspond to
powers of 2 which contribute additively to config("trace"):
1: opcodes are displayed as functions are evaluated
2: disables the inclusion of debug lines in opcodes for functions
whose definitions are introduced with a left-brace.
4: the number of links for real and complex numbers are displayed
when the numbers are printed; for real numbers "#" or for
complex numbers "##", followed by the number of links, are
printed immediately after the number.
8: the opcodes for a new functions are displayed when the function
is successfully defined.
See also resource_debug, calc_debug and user_debug below for more
debug levels.
=-=
config("display", int)
The "display" parameter specifies the maximum number of digits after
the decimal point to be printed in real or exponential mode in
normal unformatted printing (print, strprint, fprint) or in
formatted printing (printf, strprintf, fprintf) when precision is not
specified. The initial value for oldstd is 20, for newstd 10.
The parameter may be changed to the value d by either
config("display", d) or by display (d). This parameter does not change
the stored value of a number. Where rounding is necessary to
display up to d decimal places, the type of rounding to be used is
controlled by config("outround").
=-=
config("epsilon", real)
epsilon(real)
The "epsilon" parameter specifies the default accuracy for the
calculation of functions for which exact values are not possible or
not desired. For most functions, the
remainder = exact value - calculated value
has absolute value less than epsilon, but, except when the sign of
the remainder is controlled by an appropriate parameter, the
absolute value of the remainder usually does not exceed epsilon/2.
Functions which require an epsilon value accept an
optional argument which overrides this default epsilon value for
that single call. The value v can be assigned to the "epsilon"
parameter by either config("epsilon", v) or epsilon(v); each of
these functions return the current epsilon value; config("epsilon")
or epsilon() returns but does not change the epsilon value.
For the transcendental functions and the functions sqrt() and
appr(), the calculated value is always a multiple of epsilon.
=-=
config("mode", "mode_string")
config("mode2", "mode_string")
The "mode" parameter is a string specifying the mode for printing of
numbers by the unformatted print functions, and the default
("%d" specifier) for formatted print functions. The initial mode
is "real". The available modes are:
config("mode") meaning equivalent
string base() call
"binary" base 2 fractions base(2)
"bin"
"octal" base 8 fractions base(8)
"oct"
"real" base 10 floating point base(10)
"float"
"default"
"integer" base 10 integer base(-10)
"int"
"hexadecimal" base 16 fractions base(16)
"hex"
"fraction" base 10 fractions base(1/3)
"frac"
"scientific" base 10 scientific notation base(1e20)
"sci"
"exp"
Where multiple strings are given, the first string listed is what
config("mode") will return.
The "mode2" controls the double base output. When set to a value
other than "off", calc outputs files in both the "base" mode as
well as the "base2" mode. The "mode2" value may be any of the
"mode" values with the addition of:
"off" disable 2nd base output mode base2(0)
The base() builtin function sets and returns the "mode" value.
The base2() builtin function sets and returns the "mode2" value.
The default "mode" is "real". The default "mode2" is "off".
=-=
config("maxprint", int)
The "maxprint" parameter specifies the maximum number of elements to
be displayed when a matrix or list is printed. The initial value is 16.
=-=
config("mul2", int)
config("sq2", int)
Mul2 and sq2 specify the sizes of numbers at which calc switches
from its first to its second algorithm for multiplying and squaring.
The first algorithm is the usual method of cross multiplying, which
runs in a time of O(N^2). The second method is a recursive and
complicated method which runs in a time of O(N^1.585). The argument
for these parameters is the number of binary words at which the
second algorithm begins to be used. The minimum value is 2, and
the maximum value is very large. If 2 is used, then the recursive
algorithm is used all the way down to single digits, which becomes
slow since the recursion overhead is high. If a number such as
1000000 is used, then the recursive algorithm is almost never used,
causing calculations for large numbers to slow down.
Units refer to internal calculation digits where each digit
is BASEB bits in length. The value of BASEB is returned by
config("baseb").
The default value for config("sq2") is 3388. This default was
established on a 1.8GHz AMD 32-bit CPU of ~3406 BogoMIPS when
the two algorithms are about equal in speed. For that CPU test,
config("baseb") was 32. This means that by default numbers up to
(3388*32)+31 = 108447 bits in length (< 32645 decimal digits) use
the 1st algorithm, for squaring.
The default value for config("mul2") is 1780. This default was
established on a 1.8GHz AMD 32-bit CPU of ~3406 BogoMIPS when
the two algorithms are about equal in speed. For that CPU test,
config("baseb") was 32. This means that by default numbers up to
(1779*32)+31 = 56927 bits in length (< 17137 decimal digits) use
the 1st algorithm, for multiplication.
A value of zero resets the parameter back to their default values.
The value of 1 and values < 0 are reserved for future use.
Usually there is no need to change these parameters.
=-=
config("pow2", int)
Pow2 specifies the sizes of numbers at which calc switches from
its first to its second algorithm for calculating powers modulo
another number. The first algorithm for calculating modular powers
is by repeated squaring and multiplying and dividing by the modulus.
The second method uses the REDC algorithm given by Peter Montgomery
which avoids divisions. The argument for pow2 is the size of the
modulus at which the second algorithm begins to be used.
Units refer to internal calculation digits where each digit
is BASEB bits in length. The value of BASEB is returned by
config("baseb").
The default value for config("pow2") is 176. This default was
established on a 1.8GHz AMD 32-bit CPU of ~3406 BogoMIPS when
the two algorithms are about equal in speed. For that CPU test,
config("baseb") was 32. This means that by default numbers up to
(176*32)+31 = 5663 bits in length (< 1704 decimal digits) use the
1st algorithm, for calculating powers modulo another number.
A value of zero resets the parameter back to their default values.
The value of 1 and values < 0 are reserved for future use.
Usually there is no need to change these parameters.
=-=
config("redc2", int)
Redc2 specifies the sizes of numbers at which calc switches from
its first to its second algorithm when using the REDC algorithm.
The first algorithm performs a multiply and a modular reduction
together in one loop which runs in O(N^2). The second algorithm
does the REDC calculation using three multiplies, and runs in
O(N^1.585). The argument for redc2 is the size of the modulus at
which the second algorithm begins to be used.
Units refer to internal calculation digits where each digit
is BASEB bits in length. The value of BASEB is returned by
config("baseb").
The default value for config("redc2") is 220. This default was
established as 5/4 (the historical ratio of config("pow2") to
config("pow2")) of the config("pow2") value. This means that if
config("baseb") is 32, then by default numbers up to (220*32)+31 =
7071 bits in length (< 2128 decimal digits) use the REDC algorithm,
for calculating powers modulo another number.
A value of zero resets the parameter back to their default values.
The value of 1 and values < 0 are reserved for future use.
Usually there is no need to change these parameters.
=-=
config("tilde", boolean)
Config("tilde") controls whether or not a leading tilde ('~') is
printed to indicate that a number has not been printed exactly
because the number of decimal digits required would exceed the
specified maximum number. The initial "tilde" value is 1.
=-=
config("tab", boolean)
Config ("tab") controls the printing of a tab before results
automatically displayed when working interactively. It does not
affect the printing by the functions print, printf, etc. The initial
"tab" value is 1.
=-=
config("quomod", bitflag)
config("quo", bitflag)
config("mod", bitflag)
config("sqrt", bitflag)
config("appr", bitflag)
config("cfappr", bitflag)
config("cfsim", bitflag)
config("outround", bitflag)
config("round", bitflag)
The "quomod", "quo", "mod", "sqrt", "appr", "cfappr", "cfsim", and
"round" control the way in which any necessary rounding occurs.
Rounding occurs when for some reason, a calculated or displayed
value (the "approximation") has to differ from the "true value",
e.g. for quomod and quo, the quotient is to be an integer, for sqrt
and appr, the approximation is to be a multiple of an explicit or
implicit "epsilon", for round and bround (both controlled by
config("round")) the number of decimal places or fractional bits
in the approximation is limited. Zero value for any of these
parameters indicates that the true value is greater than the approximation,
i.e. the rounding is "down", or in the case of mod, that the
residue has the same sign as the divisor. If bit 4 of the
parameter is set, the rounding of to the nearest acceptable candidate
when this is uniquely determined; in the remaining ambiguous cases,
the type of rounding is determined by the lower bits of the parameter
value. If bit 3 is set, the rounding for quo, appr and sqrt,
is to the nearest even integer or the nearest even multiple of epsilon,
and for round to the nearest even "last decimal place". The effects
of the 3 lowest bits of the parameter value are as follows:
Bit 0: Unconditional reversal (down to up, even to odd, etc.)
Bit 1: Reversal if the exact value is negative
Bit 2: Reversal if the divisor or epsilon is negative
(Bit 2 is irrelevant for the functions round and bround since the
equivalent epsilon (a power of 1/10 or 1/2) is always positive.)
For quomod, the quotient is rounded to an integer value as if
evaluating quo with config("quo") == config("quomod"). Similarly,
quomod and mod give the same residues if config("mod") == config("quomod").
For the sqrt function, if bit 5 of config("sqrt") is set, the exact
square-root is returned when this is possible; otherwise the
result is rounded to a multiple of epsilon as determined by the
five lower order bits. Bit 6 of config("sqrt") controls whether the
principal or non-principal square-root is returned.
For the functions cfappr and cfsim, whether the "rounding" is down
or up, etc. is controlled by the appropriate bits of config("cfappr")
and config("cfsim") as for quomod, quo, etc.
The "outround" parameter determines the type of rounding to be used
by the various kinds of printing to the output: bits 0, 1, 3 and 4
are used in the same way as for the functions round and bround.
The C language method of modulus and integer division is:
config("quomod", 2)
config("quo", 2)
config("mod", 2)
=-=
config("leadzero", boolean)
The "leadzero" parameter controls whether or not a 0 is printed
before the decimal point in non-zero fractions with absolute value
less than 1, e.g. whether 1/2 is printed as 0.5 or .5. The
initial value is 0, corresponding to the printing .5.
=-=
config("fullzero", boolean)
The "fullzero" parameter controls whether or not in decimal floating-
point printing, the digits are padded with zeros to reach the
number of digits specified by config("display") or by a precision
specification in formatted printing. The initial value for this
parameter is 0, so that, for example, if config("display") >= 2,
5/4 will print in "real" mode as 1.25.
=-=
config("maxscan", int)
The maxscan value controls how many scan errors are allowed
before the compiling phase of a computation is aborted. The initial
value of "maxscan" is 20. Setting maxscan to 0 disables this feature.
=-=
config("prompt", str)
The default prompt when in interactive mode is "> ". One may change
this prompt to a more cut-and-paste friendly prompt by:
config("prompt", "; ")
On windowing systems that support cut/paste of a line, one may
cut/copy an input line and paste it directly into input. The
leading ';' will be ignored.
=-=
config("more", str)
When inside multi-line input, the more prompt is used. One may
change it by:
config("more", ";; ")
=-=
config("blkmaxprint", int)
The "blkmaxprint" config value limits the number of octets to print
for a block. A "blkmaxprint" of 0 means to print all octets of a
block, regardless of size.
The default is to print only the first 256 octets.
=-=
config("blkverbose", boolean)
The "blkverbose" determines if all lines, including duplicates
should be printed. If TRUE, then all lines are printed. If false,
duplicate lines are skipped and only a "*" is printed in a style
similar to od. This config value has not meaning if "blkfmt" is "str".
The default value for "blkverbose" is FALSE: duplicate lines are
not printed.
=-=
config("blkbase", "blkbase_string")
The "blkbase" determines the base in which octets of a block
are printed. Possible values are:
"hexadecimal" Octets printed in 2 digit hex
"hex"
"default"
"octal" Octets printed in 3 digit octal
"oct"
"character" Octets printed as chars with non-printing
"char" chars as \123 or \n, \t, \r
"binary" Octets printed as 0 or 1 chars
"bin"
"raw" Octets printed as is, i.e. raw binary
"none"
Where multiple strings are given, the first string listed is what
config("blkbase") will return.
The default "blkbase" is "hexadecimal".
=-=
config("blkfmt", "blkfmt_string")
The "blkfmt" determines for format of how block are printed:
"lines" print in lines of up to 79 chars + newline
"line"
"strings" print as one long string
"string"
"str"
"od_style" print in od-like format, with leading offset,
"odstyle" followed by octets in the given base
"od"
"hd_style" print in hex dump format, with leading offset,
"hdstyle" followed by octets in the given base, followed
"hd" by chars or '.' if no-printable or blank
"default"
Where multiple strings are given, the first string listed is what
config("blkfmt") will return.
The default "blkfmt" is "hd_style".
=-=
config("calc_debug", bitflag)
The "calc_debug" is intended for controlling internal calc routines
that test its operation, or collect or display information that
might be useful for debug purposes. Much of the output from these
will make sense only to calc wizards. Zero value (the default for
both oldstd and newstd) of config("resource_debug") corresponds to
switching off all these routines. For nonzero value, particular
bits currently have the following meanings:
n Meaning of bit n of config("calc_debug")
0 outputs shell commands prior to execution
1 outputs currently active functions when a quit instruction
is executed
2 some details of hash states are included in the output
when these are printed
3 when a function constructs a block value, tests are
made that the result has the properties required for use of
that block, e.g. that the pointer to the start of the
block is not NULL, and that its "length" is not negative.
A failure will result in a runtime error.
4 Report on changes to the state of stdin as well as changes
to internal variables that control the setting and restoring
of stdin.
5 Report on changes to the run state of calc.
6 Report on rand() subtractive 100 shuffle generator issues.
7 Report on custom function issues.
Bits >= 8 are reserved for future use and should not be used at this time.
By default, "calc_debug" is 0. The initial value may be overridden
by the -D command line option.
=-=
config("resource_debug", bitflag)
config("lib_debug", bitflag)
The "resource_debug" parameter is intended for controlling the possible
display of special information relating to functions, objects, and
other structures created by instructions in calc scripts.
Zero value of config("resource_debug") means that no such information
is displayed. For other values, the non-zero bits which currently
have meanings are as follows:
n Meaning of bit n of config("resource_debug")
0 When a function is defined, redefined or undefined at
interactive level, a message saying what has been done
is displayed.
1 When a function is defined, redefined or undefined during
the reading of a file, a message saying what has been done
is displayed.
2 Show func will display more information about a functions
arguments and argument summary information.
3 During execution, allow calc standard resource files
to output additional debugging information.
The value for config("resource_debug") in both oldstd and newstd
is 3, but if calc is invoked with the -d flag, its initial value
is zero. Thus, if calc is started without the -d flag, until
config("resource_debug") is changed, a message will be output when
a function is defined either interactively or during the reading of
a file.
The name config("lib_debug") is equivalent to config("resource_debug")
and is included for backward compatibility.
By default, "resource_debug" is 3. The -d flag changes this default to 0.
The initial value may be overridden by the -D command line option.
=-=
config("user_debug", int)
The "user_debug" is provided for use by users. Calc ignores this value
other than to set it to 0 by default (for both "oldstd" and "newstd").
No calc code or standard resource should change this value. Users
should feel free to use it in any way. In particular they may
use particular bits for special purposes as with "calc_debug", or
they may use it to indicate a debug level with larger values
indicating more stringent and more informative tests with presumably
slower operation or more memory usage, and a particular value (like
-1 or 0) corresponding to "no tests".
By default, "user_debug" is 0. The initial value may be overridden
by the -D command line option.
=-=
config("verbose_quit", boolean)
The "verbose_quit" controls the print of the message:
quit or abort executed
when a non-interactive quit or abort without an argument is encountered.
A quit of abort without an argument does not display a message when
invoked at the interactive level.
By default, "verbose_quit" is false.
=-=
config("ctrl_d", "ctrl_d_string")
For calc that is using the calc binding (not GNU-readline) facility:
The "ctrl_d" controls the interactive meaning of ^D (Control D):
"virgin_eof" If ^D is the only character that has been typed
"virgineof" on a line, then calc will exit. Otherwise ^D
"virgin" will act according to the calc binding, which
"default" by default is a Emacs-style delete-char.
"never_eof" The ^D never exits calc and only acts according
"nevereof" calc binding, which by default is a Emacs-style
"never" delete-char.
"empty_eof" The ^D always exits calc if typed on an empty line.
"emptyeof" This condition occurs when ^D either the first
"empty" character typed, or when all other characters on
the line have been removed (say by deleting them).
Where multiple strings are given, the first string listed is what
config("ctrl_d") will return.
Note that config("ctrl_d") actually controls each and every character
that is bound to ``delete_char''. By default, ``delete_char'' is
Control D. Any character(s) bound to ``delete_char'' will cause calc
to exit (or not exit) as directed by config("ctrl_d").
See the ``binding'' help for information on the default calc bindings.
The default "ctrl_d", without GNU-readline is "virgin_eof".
For calc that was compiled with the GNU-readline facility:
The "ctrl_d" controls the interactive meaning of ^D (Control D):
"virgin_eof" Same as "empty_eof"
"virgineof"
"virgin"
"default"
"never_eof" The ^D never exits calc and only acts according
"nevereof" calc binding, which by default is a Emacs-style
"never" delete-char.
"empty_eof" The ^D always exits calc if typed on an empty line.
"emptyeof" This condition occurs when ^D either the first
"empty" character typed, or when all other characters on
Where multiple strings are given, the first string listed is what
config("ctrl_d") will return.
The default "ctrl_d", with GNU-readline is effectively "empty_eof".
Literally it is "virgin_eof", but since "virgin_eof" is the
same as "empty_eof", the default is effectively "empty_eof".
Emacs users may find the default behavior objectionable, particularly
when using the GNU-readline facility. Such users may want to add the line:
config("ctrl_d", "never_eof"),;
to their ~/.calcrc startup file to prevent ^D from causing calc to exit.
=-=
config("program") <== NOTE: This is a read-only config value
The full path to the calc program, or the calc shell script can be
obtained by:
config("program")
This config parameter is read-only and cannot be set.
=-=
config("basename") <== NOTE: This is a read-only config value
The calc program, or the calc shell script basename can be obtained by:
config("basename")
The config("basename") is the config("program") without any leading
path. If config("program") has a / in it, config("basename") is
everything after the last /, otherwise config("basename") is the
same as config("program").
This config parameter is read-only and cannot be set.
=-=
config("windows") <== NOTE: This is a read-only config value
Returns TRUE if you are running on a MS windows system, false if you
are running on an operating system that does not hate you.
This config parameter is read-only and cannot be set.
=-=
config("cygwin") <== NOTE: This is a read-only config value
Returns TRUE if you calc was compiled with cygwin, false otherwise.
This config parameter is read-only and cannot be set.
=-=
config("compile_custom") <== NOTE: This is a read-only config value
Returns TRUE if you calc was compiled with -DCUSTOM. By default,
the calc Makefile uses ALLOW_CUSTOM= -DCUSTOM so by default
config("compile_custom") is TRUE. If, however, calc is compiled
without -DCUSTOM, then config("compile_custom") will be FALSE.
The config("compile_custom") value is only affected by compile
flags. The calc -D runtime command line option does not change
the config("compile_custom") value.
See also config("allow_custom").
This config parameter is read-only and cannot be set.
=-=
config("allow_custom") <== NOTE: This is a read-only config value
Returns TRUE if you custom functions are enabled. To allow the use
of custom functions, calc must be compiled with -DCUSTOM (which it
is by default) AND calc run be run with the -D runtime command line
option (which it is not by default).
If config("allow_custom") is TRUE, then custom functions are allowed.
If config("allow_custom") is FALSE, then custom functions are not
allowed.
See also config("compile_custom").
This config parameter is read-only and cannot be set.
=-=
config("version") <== NOTE: This is a read-only config value
The version string of the calc program can be obtained by:
config("version")
This config parameter is read-only and cannot be set.
=-=
config("baseb") <== NOTE: This is a read-only config value
Returns the number of bits in the fundamental base in which
internal calculations are performed. For example, a value of
32 means that calc will perform many internal calculations in
base 2^32 with digits that are 32 bits in length.
For libcalc programmers, this is the value of BASEB as defined
in the zmath.h header file.
This config parameter is read-only and cannot be set.
=-=
config("redecl_warn", boolean)
Config("redecl_warn") controls whether or not a warning is issued
when redeclaring variables.
The initial "redecl_warn" value is 1.
=-=
config("dupvar_warn", boolean)
Config("dupvar_warn") controls whether or not a warning is issued
when a variable name collides with an exist name of a higher scope.
Examples of collisions are when:
* both local and static variables have the same name
* both local and global variables have the same name
* both function parameter and local variables have the same name
* both function parameter and global variables have the same name
The initial "redecl_warn" value is 1.
=-=
config("hz") <== NOTE: This is a read-only config value
Returns the rate at which the operating system advances the clock
on POSIX based systems. Returns 0 on non-POSIX based systems.
The non-zero value returned is in Hetrz.
This config parameter is read-only and cannot be set.
EXAMPLE
; current_cfg = config("all");
; config("tilde", off),;
; config("calc_debug", 15),;
; config("all") == current_cfg
0
; config("all", current_cfg),;
; config("all") == current_cfg
1
; config("version")
"2.12.0"
; config("all")
mode "real"
mode2 "off"
display 20
epsilon 0.00000000000000000001
trace 0
maxprint 16
mul2 20
sq2 20
pow2 40
redc2 50
tilde 1
tab 1
quomod 0
quo 2
mod 0
sqrt 24
appr 24
cfappr 0
cfsim 8
outround 24
round 24
leadzero 1
fullzero 0
maxscan 20
prompt "; "
more ";; "
blkmaxprint 256
blkverbose 0
blkbase "hexadecimal"
blkfmt "hd_style"
resource_debug 3
lib_debug 3
calc_debug 0
user_debug 0
verbose_quit 0
ctrl_d "virgin_eof"
program "calc"
basename "calc"
windows 0
cygwin 0
compile_custom 1
allow_custom 0
version "2.12.0"
baseb 32
redecl_warn 1
dupvar_warn 1
hz 100
; display()
20
; config("display", 50),;
; display()
50
LIMITS
none
LINK LIBRARY
n/a
SEE ALSO
usage, custom, custom_cal, usage, epsilon, display
## Copyright (C) 1999-2007 Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL. You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.3 $
## @(#) $Id: config,v 30.3 2007/09/21 01:27:27 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/config,v $
##
## Under source code control: 1991/07/21 04:37:17
## File existed as early as: 1991
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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