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README

GNU bc version 1.07:

Extra configuration options:

--with-readline tells bc to use the readline package that allows
	  for editing input lines when run interactive.

--with-editline tells bc to use the BSD editline package that
	  allows for editing input lines when run interactive.

Extra make steps:

The simple make compiles a version of bc with fixed parameters
	for the recursive multiplication algorithm.  The fixed parameter
	is the number of digits where a sequential algorithm is used
	instead of the recursive algorithm.  It is set to a value that
	is known good on a couple of machines. (Sparc Ultra 10, Pentium
	II, 450.)  I'm calling this point the crossover point.

To make a version of bc with a custom crossover point for your
	machine, do the following steps:

make timetest
		make

The timetest step takes a minimum of 10 minutes to complete.

-------- Original comp.sources.reviewed README --------

Program: GNU bc
Author: Philip A. Nelson
E-mail: phil@cs.wwu.edu
OS: UNIX (BSD, System V, MINIX, POSIX)
Copying: GNU GPL version 2
Copyright holder: Free Software Foundation, Inc. 
Version: bc version 1.01
Required: vsprintf and vfprintf routines.
Machines: It has been compiled and run on the following environments:
	BSD4.3 (VAX 11)
	MINIX 1.5 (IBM PC, both K&R and ANSI compilers)
	MINIX 1.5 (pc532)
	SUN-OS 4.1 (SUN 3 and SUN 4)
	SVR3V5 (Motorola 68K)
	SVR3.2 (3B2)
	SVR4.0.2 (a 386 box)
	ULTRIX 4.1 (DEC 5000)
	UTS (Amdahl)

bc is an arbitrary precision numeric processing language.  Syntax is
similar to C, but differs in many substantial areas.  It supports
interactive execution of statements.  bc is a utility included in the
POSIX P1003.2/D11 draft standard.

This version was written to be a POSIX compliant bc processor with
several extensions to the draft standard.  Option flags are available
to cause warning or rejection of the extensions to the POSIX standard.
For those who want only POSIX bc with no extensions, a grammar is
provided for exactly the language described in the POSIX document.
The grammar (sbc.y) comes from the POSIX document.  The Makefile
contains rules to make sbc.  (for Standard BC)

Since the POSIX document does not specify how bc must be implemented,
this version does not use the historical method of having bc be a
compiler for the dc calculator.  This version has a single executable
that both compiles the language and runs the a resulting "byte code".
The "byte code" is NOT the dc language.

Also, included in the initial distribution is the library file
vfprintf.c for MINIX systems.  My minix 1.5 did not have this file.
Also, you should verify that vsprintf.c works correctly on your
system.

The extensions add some features I think are missing.  The major
changes and additions for bc are (a) names are allowed to be full
identifiers ([a-z][a-z0-9_]*), (b) addition of the &&, ||, and !
operators, (c) allowing comparison and boolean operations in any
expression, (d) addition of an else clause to the if statement, (e)
addition of a new standard function "read()" that reads a number from
the standard input under program control, (f) passing of arrays as
parameters by variable, (g) addition of the "halt" statement that is
an executable statement unlike the quit (i.e.  "if (1 == 0) quit" will
halt bc but "if (1 == 0) halt" will not halt bc.), and (h) the
addition of the special variable "last" that is assigned the value of
each print as the number is printed.
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