.\"
.\" Copyright (c) 1994 David I. Bell and Landon Curt Noll
.\" Permission is granted to use, distribute, or modify this source,
.\" provided that this copyright notice remains intact.
.\"
.\" calculator by David I. Bell
.\" man page by Landon Noll
.TH calc 1 "^..^" "15nov93"
.SH NAME
calc \- arbitrary precision calculator
.SH SYNOPSIS
\fIcalc\fP
[\fI\-h\fP]
[\fI\-m mode\fP]
[\fI\-p\fP]
[\fI\-q\fP]
[\fI\-u\fP]
[\fI\-v\fP]
[\fIcalc_cmd \&.\|.\|.\fp]
.SH DESCRIPTION
\&
.br
CALC COMMAND LINE
.PP
.TP
\fI\-h\fP
Print a help message.
This option implies \fI \-q\fP.
This is equivalent to the calc command \fIhelp help\fP.
The help facility is disabled unless the \fImode\fP is 5 or 7.
See \fI\-m\fP below.
.sp
.TP
\fI\-m mode\fP
This flag sets the permission mode of calc.
It controls the ability for \fIcalc\fP to open files
and execute programs.
\fIMode\fP may be a number from 0 to 7.
.sp
The \fImode\fP value is interpreted in a way similar
to that of the \fRchmod(1)\fP octal mode:
.sp
.in +0.5i
.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 -0.5i
.sp
If one wished to run calc from a privledged user, one might
want to use \fI\-m 0\fP in an effort to make calc more secure.
.sp
\fIMode\fP bits for reading and writing apply only on an open.
Files already open are not effected.
Thus if one wanted to use the \fI\-m 0\fP in an effort to make
\fIcalc\fP more secure, but still wanted to read and write a specific
file, one might want to do:
.sp
.in +0.5i
.nf
\fRcalc \-m 0 3<a.file\fP
.fi
.in -0.5i
.sp
Files presented to \fIcalc\fP in this way are opened in an unknown mode.
\fICalc\fP will attempt to read or write them if directed.
.sp
If the \fImode\fP disables opening of files for reading, then
the startup library scripts are disabled as of \fI\-q\fP was given.
The reading of key bindings is also disabled when the \fImode\fP
disables opening of files for reading.
.TP
\fI \-p\fP
Pipe processing is enabled by use of \-p.  For example:
.sp
.in +0.5i
.nf
\fRecho "print 2^21701\-1, 2^23209\-1" | calc \-p | fizzbin\fP
.fi
.in -0.5i
.sp
In pipe mode, \fIcalc\fP does not prompt, does not print leading tabs
and does not print the initial header.
.TP
\fI \-q\fP
Disable the use of the \fI$CALCRC\fP startup scripts.
.TP
\fI \-u\fP
Disable buffering of stdin and stdout.
.TP
\fI \-v\fP
Print the version and exit.
.PP
Without \fIcalc_cmd\fPs, \fIcalc\fP operates interactively.
If one or more \fIcalc_cmd\fPs are given on the command line,
\fIcalc\fP will execute them and exit.
The printing of leading tabs on output is disabled
as if \fIconfig("tab",0)\fP had been executed.
.PP
Normally on startup, \fIcalc\fP attempts to execute a collection
of library scripts.
The environment variable \fI$CALCRC\fP (if non-existent then
a compiled in value) contains a \fI:\fP separated list of
startup library scripts.
No error conditions are produced if these startup library scripts
are not found.
.PP
If the \fImode\fP disables opening of files for reading, then
the startup library scripts are disabled as of \fI\-q\fP was given
and \fI$CALCRC\fP as well as the default compiled in value are ignored.
.PP
Filenames are subject to ``~'' expansion (see below).
The environment variable \fI$CALCPATH\fP (if non-existent then
a compiled in value) contains a \fI:\fP separated list of search
directories.
If a file does not begin with \fI/\fP, \fI~\fP or \fI./\fP,
then it is searched for under each directory listed in the \fI$CALCPATH\fP.
It is an error if no such readable file is found.
.PP
Calc treats all open files, other than stdin, stdout and stderr
as files available for reading and writing.
One may present calc with an already open file in the following way:
.sp
.in +0.5i
.nf
\fRcalc 3<open_file 4<open_file2\fP
.fi
.in -0.5i
.PP
For more information use the following calc commands:
.PP
.in 1.0i
help usage
.br
help help
.br
help environment
.in -1.0i
.PP
OVERVIEW
.PP
\fICalc\fP is arbitrary precision arithmetic system that uses
a C-like language.
\fICalc\fP is useful as a calculator, an algorithm prototyped
and as a mathematical research tool.
More importantly, \fIcalc\fP provides one with a machine
independent means of computation.
.PP
\fICalc\fP comes with a rich set of builtin mathematical
and programmatic functions.
.PP
\fICalc\fP is distributed with library of scripts.
Written in the same C-like language, library scripts may be
read in and executed during a \fIcalc\fP session.
These library scripts are also provided because they are
useful and to serve as examples of the \fIcalc\fP language.
One may further extend \fIcalc\fP thru the
use of user defined scripts.
.PP
Internally calc represents numeric values as fractions reduced to their
lowest terms.
The numerators and denominators of these factions may grow to
arbitrarily large values.
Numeric values read in are automatically converted into rationals.
The user need not be aware of this internal representation.
.PP
For more information use the following calc commands:
.PP
.in 1.0i
help intro
.br
help builtin
.br
help stdlib
.br
help define
.br
show builtins
.br
show functions
.in -1.0i
.PP
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 calc commands:
.PP
.in 1.0i
help types
.br
help obj
.br
show objfuncs
.in -1.0i
.PP
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
a list that permits stack and queue style operations.
.PP
For more information use the following calc commands:
.PP
.in 1.0i
help variable
.br
help mat
.br
help list
.br
show globals
.in -1.0i
.PP
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 calc command:
.PP
.in 1.0i
help file
.in -1.0i
.PP
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 library scripts, dump files to a file, error notification,
configuration control and status.
.PP
For more information use the following 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
\&
.br
.PD 0
.TP 20
${LIBDIR}/*.cal
library scripts shipped with calc
.br
.sp
.TP 20
${LIBDIR}/help/*
help files
.br
.sp
.TP 20
${LIBDIR}/bindings
command line editor bindings
.sp
.SH ENVIRONMENT
\&
.br
.PD 0
.TP 5
CALCPATH
A :-separated list of directories used to search for
scripts filenames that do not begin with /, ./ or ~.
.br
.sp
Default value: ${CALCPATH}
.br
.sp
.TP 5
CALCRC
On startup (unless \-h or \-q was given on the command
line), calc searches for files along this :-separated
environment variable.
.br
.sp
Default value: ${CALCRC}
.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), calc reads
key bindings from the filename specified
by this environment variable.
.br
.sp
Default value: ${CALCBINDINGS}
.sp
.SH CREDIT
\&
.br
The majority of calc was written by David I. Bell.
.sp
Calc archives and calc-tester mailing list maintained by Landon Curt Noll.
.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.
.sp
Most of this source and binary has one of the following copyrights:
.sp
.in +0.5i
Copyright (c) 19xx David I. Bell
.br
Copyright (c) 19xx David I. Bell and Landon Curt Noll
.br
Copyright (c) 19xx Landon Curt Noll
.br
Copyright (c) 19xx Ernest Bowen and Landon Curt Noll
.in -0.5i
.sp
Permission is granted to use, distribute, or modify this source,
provided that this copyright notice remains intact.
.sp
Send calc comments, suggestions, bug fixes, enhancements
and interesting calc scripts that you would like you see included
in future distributions to:
.sp
.in +0.5i
dbell@auug.org.au
.br
chongo@toad.com
.in -0.5i
.sp
Landon Noll maintains the official calc ftp archive at:
.sp
.in +0.5i
ftp://ftp.uu.net/pub/calc
.in -0.5i
.sp
Alpha test versions, complete with bugs, untested code and
experimental features may be fetched (if you are brave) under:
.sp
.in +0.5i
http://reality.sgi.com/chongo/calc/
.in -0.5i
.sp
One may join the calc testing group by sending a request to:
.sp
.in +0.5i
calc-tester-request@postofc.corp.sgi.com
.in -0.5i
.sp
Your message body (not the subject) should consist of:
.sp
.in +0.5i
subscribe calc-tester address
.br
end
.br
name your_full_name
.sp
where "address" is your EMail address and "your_full_name"
is your full name.
.in -0.5i
.sp
Enjoy!