.\"
.\" Copyright (C) 1999-2007,2014,2018,2021	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.
.\"
.\" Under source code control:	    1991/07/23 05:48:26
.\" 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/
.\"
.\" calculator by David I. Bell
.\" man page by Landon Noll
.\"
.TH calc 1 "^..^" "Share and enjoy!  :-)"
.SH NAME
calc \- arbitrary precision calculator
.SH SYNOPSIS
\fIcalc\fP
.RB [ \-c ]
.RB [ \-C ]
.RB [ \-d ]
.br
.in +5n
.RB [ -D\ \&calc_debug[:resource_debug[:user_debug]] ]
.br
.RB [ \-e ]
.RB [ \-f\ \&filename ]
.RB [ \-h ]
.RB [ \-i ]
.RB [ \-m\ \&mode ]
.RB [ \-O ]
.br
.RB [ \-p ]
.RB [ \-q ]
.RB [ \-s ]
.RB [ \-u ]
.RB [ \-v ]
.RB [ [\-\-]\ calc_cmd\ \&.\|.\|. ]
.in -5n
.sp
\fI#!/usr/bin/calc\fP\ [optional_other_flags\ \&...] \fB\-f\fP

.PP

.SH DESCRIPTION

.PP

.TP
.B \-c
Continue reading command lines even after a scan/parse
error has caused the abandonment of a line.
Note that this option only deals with scanning and
parsing of the calc language.
It does not deal with execution or run-time errors.
.sp 1
For example:
.sp 1
.in +5n
.nf
calc read many_errors.cal
.fi
.in -5n
.sp 1
will cause
.B calc
to abort on the first syntax error, whereas:
.sp 1
.in +5n
.nf
calc -c read many_errors.cal
.fi
.in -5n
.sp 1
will
cause
.B calc
to try to process each line being read
despite the scan/parse errors that it encounters.
.sp 1
By default, calc startup resource files are silently
ignored if not found.
This flag will report missing
startup resource files unless
.B \-d
is also given.

.TP
.B \-C
Permit the execution of custom builtin functions.
Without
this flag, calling the custom() builtin function will
simply generate an error.
.sp 1
Use of this flag may cause
.B calc
to execute functions
that are non-standard and that are not portable.  Custom builtin
functions are disabled by default for this reason.

.TP
.B \-d
Disable the printing of the opening title.  The printing
of resource file debug and informational messages is also disabled
as if \fBconfig("resource_debug", 0)\fP had been executed.
.sp 1
For example:
.sp 1
.in +5n
calc "read qtime; qtime(2)"
.in -5n
.sp 1
will output something like:
.sp 1
.in +5n
.nf
qtime(utc_hr_offset) defined
It's nearly ten past six.
.fi
.in -5n
.sp 1
whereas:
.sp 1
.in +5n
.nf
calc -d "read qtime; qtime(2)"
.fi
.in -5n
.sp 1
will just print:
.sp 1
.in +5n
.nf
It's nearly ten past six.
.fi
.in -5n
.sp 1
This flag disables the reporting of missing calc
startup resource files.
.sp 1

This flag also disables the printing the leading tilde. For example:
.sp 1
.in +5n
.nf
calc 2/3
.fi
.in -5n
.sp 1
will print:
.sp 1
.in +5n
.nf
~0.66666666666666666667
.fi
.in -5n
.sp 1
.sp 1
whereas:
.sp 1
.in +5n
.nf
calc -d 2/3
.fi
.in -5n
.sp 1
will just print:
.sp 1
.in +5n
.nf
0.66666666666666666667
.fi
.in -5n
.sp 1

.TP
.BR -D " calc_debug[:resource_debug[:user_debug]]"
Force the initial value of config("calc_debug"),
config("resource_debug") and config("user_debug").
.sp 1
The : separated strings are interpreted as signed 32 bit integers.
After an optional leading sign a leading zero indicates octal
conversion, and a leading ``0x'' or ``0X'' hexadecimal
conversion.  Otherwise, decimal conversion is assumed.
.sp 1
By default,
.I calc_debug
is 0,
.I resource_debug
is 3 and
.I user_debug
is 0.
.sp 1
For more information use the following
.B calc
command:
.sp 1
.in +5n
.nf
help config
.fi
.in -5n

.TP
.B \-e
Ignore any environment variables on startup.
The getenv() builtin will still return values, however.

.TP
.BR \-f " filename"
This flag is normally only with calc shell scripts.
.sp 1
This flag is required when using calc in
.BR "shell script mode" .
It must be at the end of the initial
.B #!
line of the script, as in:
.sp 1
.in +5n
.nf
\fI#!/usr/bin/calc\fP\ [optional_other_flags\ \&...] \fB\-f\fP
.fi
.in -5n
.sp 1
the rest of the file will be processed in
.BR "shell script mode" .

.sp 1
A common flag to use, prior to the
.B \-f
on the #! line is the
.B \-q
flag.
For example:
.sp 1
.in +5n
.nf
\fI#!/usr/bin/calc\fP \fB\-q\fP \fB\-f\fP
.fi
.in -5n

.sp 1
See
.B "SHELL SCRIPT MODE"
section of this man page
below for details.
.sp 1
While the actual form of this flag is:
.sp 1
.in +5n
.BR \-f
filename
.in -5n
.sp 1
for systems that treat an executable that begins with
.B #!
as a script, the path of the executable is appended by the kernel
as the final argument to the exec() system call.
This is why the
.B \-f
flag at the very end of the
.B #!
line.
.sp 1
It is possible use
.B \-f
filename
on the command line:
.sp 1
.in +5n
.nf
\fIcalc\fP\ [optional_other_flags\ \&...] \fB\-f\fP filename
.fi
.in -5n
.sp 1
This will cause calc to process lines in
.B filename
in
.BR "shell script mode" .

.sp 1
.B NOTE:
The use of
.BR \-f
does
.B NOT
imply
.BR \-q
and thus one would need to use
.sp 1
.in +5n
.nf
\fIcalc\fP\ [optional_other_flags\ \&...] \fB\-q\fP \fB\-f\fP filename
.fi
.in -5n
.sp 1
to disable the use of calc startup files as well.

.sp 1
The use of
.B \-f
filename
implies the
.B \-s
flag.

.TP
.B \-h
Print a help message.  This option implies
.BR \-q .
This
is equivalent to the
.B calc
command help help.
The help facility is disabled unless the mode is 5 or 7.
See
.BR \-m .

.TP
.B \-i
Become interactive if possible.
This flag will cause
.B calc
to drop into interactive mode after the
.I calc_cmd
arguments on the command line are evaluated.
Without this flag,
.B calc
will exit after they are evaluated.
.sp 1
For example:
.sp 1
.in +5n
.nf
calc 2+5
.fi
.in -5n
.sp 1
will print the value 7 and exit whereas:
.sp 1
.in +5n
.nf
calc -i 2+5
.fi
.in -5n
.sp 1
will print the value 7 and prompt the user for more
.B calc
commands.

.TP
.BR \-m " mode"
This flag sets the permission mode of
.BR calc .
It controls the ability for
.B calc
to open files and execute programs.
.I Mode
may be a number from 0 to 7.
.sp 1
The mode value is interpreted in a way similar to that
of the
.BR chmod (1)
octal mode:
.sp 1
.in +5n
.nf
0  do not open any file, do not execute progs
1  do not open any file
2  do not open files for reading, do not execute progs
3  do not open files for reading
4  do not open files for writing, do not execute progs
5  do not open files for writing
6  do not execute any program
7  allow everything (default mode)
.fi
.in -5n
.sp 1
If one wished to run
.B calc
from a privileged user, one might want to use
.BR \-m " 0"
in an effort to make
.B calc
somewhat more secure.
.sp 1
Mode bits for reading and writing apply only on an
open.
Files already open are not effected.
Thus if one wanted to use the
.BR \-m " 0"
in an effort to make
.B calc
somewhat more secure, but still wanted to read and write a specific
file, one might want to do in
.BR sh (1),
.BR ksh (1),
.BR bash (1)-like
shells:
.sp 1
.in +5n
.nf
calc -m 0 3<a.file
.fi
.in -5n
.sp 1
Files presented to
.B calc
in this way are opened in an
unknown mode.
.B Calc
will attempt to read or write them if directed.
.sp 1
If the mode disables opening of files for reading, then
the startup resource files are disabled as if
.B \-q
was given.
The reading of key bindings is also disabled
when the mode disables opening of files for reading.

.TP
.B \-O
Use the old classic defaults instead of the
default configuration.
This flag as the same effect
as executing \fBconfig("all", "oldcfg")\fP at startup time.
.sp 1
NOTE: Older versions of calc used
.B \-n
to setup a modified form of the default calc configuration.
The
.B \-n
flag currently does nothing.
Use of the
.B \-n
flag is now deprecated and may be used for
something else in the future.

.TP
.B \-p
Pipe processing is enabled by use of
.BR \-p .
For example:
.sp 1
.in +5n
.nf
calc -p "2^21701-1" | fizzbin
.fi
.in -5n
.sp 1
In pipe mode,
.B calc
does not prompt, does not print leading
tabs and does not print the initial header.
The
.B \-p
flag overrides
.BR \-i .

.sp 1
When running calc as a shell script (see
.B "SHELL SCRIPT MODE"
for details), calc will close standard input (stdin)
during startup
.B UNLESS
the
.B \-p
flag is given on the command line.
When calc is running in
.BR "shell script mode" ,
shell scripts that call the
.BR prompt (str)
builtin will not work properly (the prompt builtin
will always fail) unless the
.B \-p
flag is given on the command line.

.TP
.B \-q
Disable the reading of the startup scripts.
.sp 1
This allows the script to run independently of
startup scripts such those managed by the
.B $CALCRC
environment variable.
For example, this will disable the use of the common calcrc file
(usually ~/.calcrc).

.TP
.B \-s
By default, all
.I calc_cmd
args are evaluated and executed.
This flag will disable their evaluation and instead make
them available as strings for the argv() builtin function.

.TP
.B \-u
Disable buffering of stdin and stdout.

.TP
.B \-v
Print the
.B calc
version number and exit.

.TP
.B \-\-
The double dash indicates to calc that no more options follow.
Thus calc will ignore a later argument on the command line
even if it starts with a dash.
This is useful when entering negative values on the command line as in:
.sp 1
.in +5n
.nf
calc \-p \-\- \-1 - -7
.fi
.in -5n
.sp 1

.PP

.SH CALC COMMAND LINE

.PP

With no
.I calc_cmd
arguments,
.B calc
operates interactively.
If one or more
arguments are given on the command line and
.B \-s
is NOT given, then
.B calc
will read and execute them and either attempt
to go interactive according as the
.B \-i
flag was present or absent.
.sp
If
.B \-s
is given,
.B calc
will not evaluate any
.I calc_cmd
arguments but instead make them available
as strings to the argv() builtin function.

Sufficiently simple commands with no characters like
parentheses, brackets, semicolons, '*', which have special
interpretations in UNIX shells may be entered, possibly with
spaces, until the terminating newline.
For example:
.sp 1
.in +5n
.nf
calc 23 + 47
.fi
.in -5n
.sp 1
will print 70.
However, command lines will have problems:
.sp 1
.in +5n
.nf
calc 23 * 47
.sp 1
calc -23 + 47
.fi
.in -5n
.sp 1
The first example above fails because the shell interprets the '*'
as a file glob.
The second example fails because '\-23' is viewed as a calc option
(which it is not) and do calc objects to that it thinks of as an unknown option.
These cases can usually be made to work as expected by
enclosing the command between quotes:
.sp 1
.in +5n
.nf
calc '23 * 47'
.sp 1
calc "print sqrt(2), exp(1)"
.fi
.in -5n
.sp 1
or in parentheses and quotes to avoid leading \-'s as in:
.sp 1
.in +5n
.nf
calc '(-23 + 47)'
.fi
.in -5n
.sp 1
One may also use a double dash to denote that calc options have ended as in:
.sp 1
.in +5n
.nf
calc -- -23 + 47
.sp 1
calc -q -- -23 + 47
.fi
.in -5n
.sp 1
If '!' is to be used to indicate the factorial function, for
shells like
.BI csh (1)
for which '!' followed by a non-space character
is used for history substitution, it may be necessary to
include a space or use a backslash to escape the special
meaning of '!'.
For example, the command:
.sp 1
.in +5n
.nf
print 27!^2
.fi
.in -5n
.sp 1
may have to be replaced by:
.sp 1
.in +5n
.nf
print 27! ^2	or	print 27\\!^2
.fi
.in -5n

Reading from standard input when calc is part of a pipe works
as long as the \-p flag is given to calc.  For example, this
will print chongo was here:
.sp 1
.in +5n
.nf
echo chongo was here | calc \-p 'print fgetline(files(0));'
.sp 1
.fi
.in -5n
.sp 1
while this does not:
.sp 1
.in +5n
.nf
echo chongo was here | calc 'print fgetline(files(0));'
.sp 1
.fi
.in -5n
.sp 1
nor will this print chongo was here:
.sp 1
.in +5n
.nf
echo chongo was here | calc \-i 'print fgetline(files(0));'
.sp 1
.fi
.in -5n
.sp 1
This is because without
.BR \-p ,
the interactive parser, in an effort
to parse interactive commands, flushes data on standard input.

.PP

.SH CALC STARTUP FILES

.PP

Normally on startup,
if the environment variable
.B $CALCRC
is undefined and
.B calc
is invoked without the
.B \-q
flag, or if
.B $CALCRC
is defined and calc is invoked with
.BR \-e ,
.B calc
looks for a file "startup" in the calc resource directory
.B .calcrc
in the user's home directory, and
.B .calcinit in the current directory.
If one or more of these are found, they are read in succession as
.B calc
scripts and their commands executed.
When defined,
.B $CALCRC
is to contain a ':' separated list of names of files,
and if calc is then invoked without either the
.B \-q
or
.B \-e
flags, these files are read in succession and their commands executed.
No error condition is produced if a listed file is not found.
.sp
If the mode specified by
.B \-m
disables opening of files for reading, then the reading of startup
files is also disabled as if
.B \-q
was given.

.PP

.SH CALC FILE SEARCH PATH

.PP

If the environment variable
.B $CALCPATH
is undefined, or if it
is defined and
.B calc
is invoked with the
.B \-e
flag, when a file name not beginning with
.BR / ,
.B ~
or
.BR ./ ,
is specified as in:
.sp 1
.in +5n
.nf
calc read myfile
.fi
.in -5n
.sp 1
.B calc
searches in succession:
.sp 1
.in +5n
.nf
\a./myfile
\a./myfile.cal
/usr/lib/myfile
/usr/lib/myfile.cal
/usr/share/calc/custom/myfile
/usr/share/calc/custom/myfile.cal
.fi
.in -5n
.sp 1
If the file is found, the
search stops and the commands in the file are executed.
It is an error if no readable file with the specified name is found.
An alternative search path can be specified by defining
.B $CALCPATH
in the same way as PATH is defined, as a ':' separated
list of directories, and then invoking
.B calc
without the
.B \-e
flag.
.PP
.B Calc
treats all open files, other than stdin, stdout and
stderr as files available for reading and writing.
One may
present
.B calc
with an already open file using
.BR sh (1),
.BR ksh (1),
.BR bash (1)-like
shells is to:
.sp 1
.in +5n
calc 3<open_file 4<open_file2
.in -5n
.sp 1
For more information use the following
.B calc
commands:
.sp 1
.in +5n
.nf
help help
help overview
help usage
help environment
help config
.fi
.in -5n
.sp 1

.PP

.SH SHELL SCRIPT MODE

.PP

If the first line of an executable file begins
.B #!
followed by the absolute pathname of the
.B calc
program and the first line ends with the flag
.B \-f
as in:
.sp 1
.in +5n
.nf
\fI#!/usr/bin/calc\fP\ [optional_other_flags\ \&...] \fB\-f\fP
.fi
.in -5n
.sp 1
the rest of the file will be processed in
.BR "shell script mode" .
Note that
.B \-s
.B \-f
must be at the end of the initial ``#!'' line.
Any other optional
.B "optional_other_flags"
must come before
the
.B \-f
flag.
.sp 1
In
.B "shell script mode"
the contents of the file are read and
executed as if they were in a file being processed by a read
command, except that a "command" beginning with '#' followed by
whitespace and ending at the next newline is treated as a comment.
Any optional
.B "optional_other_flags"
will be parsed first followed by
the later lines within the script itself.
.sp 1
In
.BR "shell script mode" ,
.B \-s
is always assumed.
In addition,
.B \-d
and
.B \-p
are automatically set if
.B \-i
is not given.
.sp 1
.B NOTE:
The use of
.BR \-f
does
.B NOT
imply
.BR \-q
and thus one would need to use
.sp 1
.in +5n
.nf
\fIcalc\fP\ [optional_other_flags\ \&...] \fB\-q\fP \fB\-f\fP filename
.fi
.in -5n
.sp 1
to disable the use of calc startup files as well.
.sp 1
For example, if
the file
.BR /tmp/mersenne :
.sp 1
.in +5n
.nf
\fI#!/usr/bin/calc\fP\ \&\fB\-q\fP \fB\-f\fP

/* setup */
argc = argv();
program = argv(0);
stderr = files(2);

/* parse args */
if (argc != 2) {
    fprintf(stderr, "usage: %s exp\n", program);
    abort "must give one exponent arg";
}
exp = eval(argv(1));
if (!isint(exp) || exp < 0) {
    fprintf(stderr, "%s: exp must be non-negative integer\n", program);
    abort "must give one exponent arg";
}

/* print the mersenne number */
print "2^": exp : "-1 =", 2^exp-1;
.fi
.in -5n
.sp 1
is made an executable file by:
.sp 1
.in +5n
.nf
chmod +x /tmp/mersenne
.fi
.in -5n
.sp 1
then the command line:
.sp 1
.in +5n
.nf
/tmp/mersenne 127
.fi
.in -5n
.sp 1
will print:
.sp 1
.in +5n
.nf
2^127-1 = 170141183460469231731687303715884105727
.fi
.in -5n
.sp 1
Note that because
.B \-s
is required in
.B "shell script mode"
non-dashed args are made available as
strings via the
.BR argv ()
builtin function.
Therefore:
.sp 1
.in +5n
.nf
2^eval(argv(1))-1
.fi
.in -5n
.sp 1
will print the decimal value of 2^n-1
whereas
.sp 1
.in +5n
.nf
2^argv(1)-1
.fi
.in -5n
.sp 1
will not.

.sp 1
By default, using calc startup in
.BR "shell script mode" ,
calc will close standard input (stdin).
Thus builtin functions such as
.BR prompt (str)
will fail (return a null value).
Calc shell scripts that call the
.BR prompt (str)
builtin will not work properly (the prompt builtin
will always fail and return a null value) unless the
.B \-p
flag is given on the command line.

.sp 1
The following shell script will always print "got null" because
stdin will be closed by calc during startup:

.sp 1
.in +5n
.nf
#!/usr/bin/calc \-q \-f

# The prompt will ALWAYS FAIL and return a null value
n = prompt("Test> ");
if (isnull(n)) {
  print("got null");
} else {
  print("got " + n);
}
.fi
.in -5n
.sp 1
However the following shell script (note the
.B \-p
before the
.B \-f
in the 1st line) will be interactive, prompt with "Test> " and print
the "got" result as expected:

.sp 1
.in +5n
.nf
#!/usr/bin/calc \-q \-p \-f

n = prompt("Test> ");
if (isnull(n)) {
  print("got null");
} else {
  print("got " + n);
}
.fi
.in -5n

.sp 1
Note in the example above, the
.B \-p
flag must be given before the final
.B \-f
command line flag.

.PP

.SH DATA TYPES

.PP

Fundamental builtin data types include integers, real numbers,
rational numbers, complex numbers and strings.
.PP
By use of an object, one may define an arbitrarily complex
data types.
One may define how such objects behave a wide range of
operations such as addition, subtraction,
multiplication, division, negation, squaring, modulus,
rounding, exponentiation, equality, comparison, printing
and so on.
.PP
For more information use the following
.B calc
commands:
.PP
.in 1.0i
help types
.br
help obj
.br
show objfuncs
.in -1.0i

.PP

.SH VARIABLES

.PP

Variables in \fIcalc\fP are typeless.
In other words, the fundamental type of a variable is determined by its content.
Before a variable is assigned a value it has the value of zero.
.PP
The scope of a variable may be global, local to a file, or local to a
procedure.
Values may be grouped together in a matrix, or into
a list that permits stack and queue style operations.
.PP
For more information use the following
.B calc
commands:
.PP
.in 1.0i
help variable
.br
help mat
.br
help list
.br
show globals
.in -1.0i

.PP

.SH INPUT/OUTPUT

.PP

A leading ``0x'' implies a hexadecimal value,
a leading ``0b'' implies a binary value,
and a ``0'' followed by a digit implies an octal value.
Complex numbers are indicated by a trailing ``i'' such as in ``3+4i''.
Strings may be delimited by either a pair of single or double quotes.
By default, \fIcalc\fP prints values as if they were floating point numbers.
One may change the default to print values in a number of modes
including fractions, integers and exponentials.
.PP
A number of stdio-like file I/O operations are provided.
One may open, read, write, seek and close files.
Filenames are subject to ``\~'' expansion to home directories
in a way similar to that of the Korn or C-Shell.
.PP
For example:
.PP
.in 1.0i
~/.calcrc
.br
~chongo/lib/fft_multiply.cal
.in -1.0i
.PP
For more information use the following
.B calc
command:
.PP
.in 1.0i
help file
.in -1.0i

.PP

.SH CALC LANGUAGE

.PP

The \fIcalc\fP language is a C-like language.
The language includes commands such as variable declarations,
expressions, tests, labels, loops, file operations, function calls.
These commands are very similar to their counterparts in C.
.PP
The language also include a number of commands particular
to \fIcalc\fP itself.
These include commands such as function definition, help,
reading in resource files, dump files to a file, error notification,
configuration control and status.
.PP
For more information use the following
.B calc
command:
.PP
.in 1.0i
help command
.br
help statement
.br
help expression
.br
help operator
.br
help config
.in -1.0i

.PP

.SH FILES

.PP

.PD 0
.TP 5
/usr/bin/calc
calc binary
.sp 1
.TP 5
/usr/share/doc/calc/examples/*
calc shell scripts
.sp 1
.TP 5
/usr/lib/*.cal
calc standard resource files
.sp 1
.TP 5
/usr/lib/help/*
help files
.sp 1
.TP 5
/usr/lib/bindings
non-GNU-readline command line editor bindings
.sp 1
.TP 5
/usr/include/calc/*.h
include files for C interface use
.sp 1
.TP 5
/usr/lib/libcalc.a
calc binary link library
.sp 1
.TP 5
/usr/lib/libcustcalc.a
custom binary link library
.sp 1
.TP 5
/usr/share/calc/custom/*.cal
custom resource files
.sp 1
.TP 5
/usr/share/calc/custhelp/*
custom help files
.sp 1

.PP

.SH ENVIRONMENT

.PP

.PD 0
.TP 5
CALCPATH
A :-separated list of directories used to search for calc
resource filenames that do not begin with /, ./ or ~.
.br
.sp
Default value: .:\:./cal:\:~/.cal:\:/usr/local/share/calc:\:/usr/share/calc:\:/usr/share/calc/custom
.br
.sp
.TP 5
CALCRC
On startup (unless \-h or \-q was given on the command
line),
.B calc
searches for files along this :-separated
environment variable.
.br
.sp
Default value: ./.calcinit:\:~/.calcrc:\:/usr/local/share/calc/startup:\:/usr/share/calc/startup
.br
.sp
.TP 5
CALCBINDINGS
On startup (unless \fI\-h\fP or \fI\-q\fP was given on the command
line, or \fI\-m\fP disallows opening files for reading),
.B calc
reads
key bindings from the filename specified
by this environment variable.
The key binding file is searched for along the $CALCPATH list
of directories.
.sp
Default value: binding
.sp
This variable is not used if calc was compiled with GNU-readline support.
In that case, the standard readline mechanisms (see readline(3)) are used.
.sp
.TP 5
CALCHISTFILE
Location of the calc history file.
.sp
Default value: ~/.calc_history
.sp
This variable is not used if calc was compiled with GNU-readline support.
.sp
.TP 5
CALCHELP
Location of the calc help directory.
.sp
Default value: /usr/share/calc/help
.sp
.TP 5
CALCCUSTOMHELP
Location of the calc custom help directory.
.sp
Default value: /usr/share/calc/custhelp
.sp

.PP

.SH CREDIT

.PP

The main chunk of
.B calc
was written by David I. Bell.
.sp
The
.B calc
primary mirror, and calc bug report
processing is performed by Landon Curt Noll.
.sp
Landon Curt Noll maintains the master reference source, performs
release control functions as well as other calc maintenance functions.
.sp
Thanks for suggestions and encouragement from Peter Miller,
Neil Justusson, and Landon Noll.
.sp
Thanks to Stephen Rothwell for writing the original version of
hist.c which is used to do the command line editing.
.sp
Thanks to Ernest W. Bowen for supplying many improvements in
accuracy and generality for some numeric functions.  Much of
this was in terms of actual code which I gratefully accepted.
Ernest also supplied the original text for many of the help files.
.sp
Portions of this program are derived from an earlier set of
public domain arbitrarily precision routines which was posted
to the net around 1984.
By now, there is almost no recognizable
code left from that original source.

.PP

.SH "COPYING / CALC GNU LESSER GENERAL PUBLIC LICENSE"

.PP

Calc is open software, and is
covered under version 2.1 of the GNU Lesser General Public License.
You are
welcome to change it and/or distribute copies of it under certain
conditions.
The calc commands:
.sp
.in +0.5i
.nf
help copyright
help copying
help copying-lgpl
help credit
.fi
.in -0.5i
.sp
should display the contents of the COPYING and COPYING-LGPL files.
Those files contain information about the calc's GNU Lesser General
Public License, and in particular the conditions under which you
are allowed to change it and/or distribute copies of it.
.sp
You should have received a copy of the version 2.1 of the GNU Lesser General
Public License.
If you do not have these files, write to:
.sp
.in +0.5i
.nf
Free Software Foundation, Inc.
51 Franklin Street
Fifth Floor
Boston, MA  02110-1301
USA
.fi
.in -0.5i
.sp
Calc is copyrighted in several different ways.
These ways include:
.sp
.in +0.5i
.nf
Copyright (C) year  David I. Bell
Copyright (C) year  David I. Bell and Landon Curt Noll
Copyright (C) year  David I. Bell and Ernest Bowen
Copyright (C) year  David I. Bell, Landon Curt Noll and Ernest Bowen
Copyright (C) year  Landon Curt Noll
Copyright (C) year  Ernest Bowen and Landon Curt Noll
Copyright (C) year  Ernest Bowen
Copyright (C) year  Petteri Kettunen and Landon Curt Noll
Copyright (C) year  Christoph Zurnieden
Copyright (C) year  Landon Curt Noll and Thomas Jones-Low
Copyright (C) year  Klaus Alexander Seistrup and Landon Curt Noll
.fi
.in -0.5i
.sp
This man page is:
.sp
.in +0.5i
.nf
Copyright (C) 1999-2023  Landon Curt Noll
.fi
.in -0.5i
.sp
and is covered under version 2.1 GNU Lesser General
Public License.
.sp
A few files in calc are covered under "The Unlicense".
For more information on this license, see:
.sp
.in +0.5i
.nf
https:\://unlicense.org
.fi
.in -0.5i
.sp

.PP

.SH "CALC QUESTIONS"

.PP

To ask the calc maintainers a general question about calc,
see the output of the following calc command:

.sp
.in +0.5i
.nf
; help question
.fi
.in +0.5i
.sp
.PP

or read the source file:

.sp
.in +0.5i
.nf
QUESTIONS
.fi
.in +0.5i
.sp

.PP

or visit the following URL:
.sp
.in +0.5i
.nf
https:\://github.com/lcn2/calc/blob/master/QUESTIONS
.fi
.in +0.5i
.sp

.PP

.SH "BUG REPORTS / BUG FIXES"

.PP

To inform the calc maintainers about a bug, or to submit a bug fix,
see the output of the following calc command:

.sp
.in +0.5i
.nf
; help bugs
.fi
.in +0.5i
.sp
.PP

or read the source file:

.sp
.in +0.5i
.nf
BUGS
.fi
.in +0.5i
.sp
.PP

or visit the following URL:
.sp
.in +0.5i
.nf
https:\://github.com/lcn2/calc/blob/master/BUGS
.fi
.in +0.5i
.sp

.PP

.SH "CONTRIBUTING CODE TO CALC"

.PP

.I Calc
is open source.
You are welcome to contribute code to calc, or submit bug fixes to to calc.
.sp
To contribute code to calc, please see see the output of
the following calc command:

.sp
.in +0.5i
.nf
; help contrib
.fi
.in +0.5i
.sp

.PP

or read the source file:

.sp
.in +0.5i
.nf
CONTRIB-CODE
.fi
.in +0.5i

.PP

or visit the following URL:
.sp
.in +0.5i
.nf
https:\://github.com/lcn2/calc/blob/master/CONTRIB-CODE
.fi
.in +0.5i
.sp

.PP

.SH "CALC WEB SITE"

.PP

Landon Noll maintains the
.B calc
web site is located at:
.sp
.in +0.5i
www.isthe.com/chongo/tech/comp/calc/
.in -0.5i

.SH "CALC SOURCE CODE"

The latest version of calc source code may be obtained at
the following GitHub repo:
.sp
.in +0.5i
https:\://github.com/lcn2/calc
.in -0.5i
.sp
The very latest calc souece is found at the top master branch.

.PP

You may download the calc releases from:
.sp
.in +0.5i
https:\://github.com/lcn2/calc/releases
.in -0.5i
.sp
The releases marked
.B ((Pre-release))
are beta releases.
.sp
The most recent release that is NOT  marked
.B ((Pre-release))
is the recommended stable release.