NAME
	dc - desk calculator

SYNOPSIS
	dc [ file ]

DESCRIPTION
	dc is an arbitrary precision arithmetic package.  Ordinarily it
	operates on decimal numbers, but you may specify an input base
	or an output base.
	The overall structure of dc is a stacking (reverse Polish)
	calculator. If an argument is given input is taken from that
	file, else standard input is used.

	The following constructions are recognized :

	number
		The value of the number is pushed on the stack.  A
		number is an unbroken string of the digits 0-9.  It
		may be preceded by an underscore (_) to input a nega-
		tive number.

	+ - / * % ^ & |
		The top two values on the stack are added (+), sub-
		tracted (-), multiplied (*), divided (/), remaindered
		(%), powered (^), anded (&), ored(|).  The two entries
		are popped off the stack; the result is pushed on the
		stack in their place.

	!	The top value on the stack is popped. If non-zero, 1 is
		pushed back on the stack, else 0 is pushed.

	~	The top value on the stack is popped, inverted, and the
		result pushed back on the stack

	sr	The top of the stack is popped and stored into a
		register named r, where r may be any character between
		a and z.

	lr	The value in register r is pushed on the stack.  The
		register r is not altered.  All registers start with
		zero value.

	d	The top value on the stack is duplicated.

	p	The top value on the stack is printed.	The top value
		remains unchanged.

	f	All values on the stack are printed.

	q	Exits the program.

	x	Treats the top element of the stack as a character
		string and executes it as a string of dc commands.

	[ ... ] Puts the bracketed ASCII string onto the top of the
		stack.

	c	All values on the stack are popped.

	i	The top value on the stack is popped and used as the
		number radix for further input.

	I	Pushes the input base on the top of the stack.

	o	The top value on the stack is popped and used as the
		number radix for further output.

	O	Pushes the output base on the top of the stack.

	k	The top value on the stack and used to set the number
		of digit displayed after decimal  point.  By  default
		precision is set to 0  :  dc  displays	only  integer
		part.

	v	The top value on the stack is replaced by its  square
		root


RETURN CODES
	 0 if all went well
	 1 in case of bad argument (fatal)
	 2 if the named file couldn't be opened (fatal)
	 3 if no memory could be allocated (fatal)
	 6 if stack was empty (fatal)
	 7 if stack was full (fatal)
	11 in case of missing bracket (fatal)
	14 if you try to compute the square root of a negative number

CHANGES FROM UNIX
	P, Q, X, <r, >r, =r, z, Z, and ? operators missing
	Registers are not stacks nor strings
	[expr] computed when popped
	Cannot handle a full expression on the same line
	Doesn't read standard input when EOF reached on named file

AUTHOR
	Denis GOUNELLE
	Last modified 04-Sep-92