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     DC(C)		      XENIX System V			 DC(C)

     Name
	  dc - Invokes an arbitrary precision calculator.

     Syntax
	  dc [ file ]

     Description
	  dc is an arbitrary precision arithmetic package.  Ordinarily
	  it operates on decimal integers, but you may specify an
	  input base, output base, and a number of fractional digits
	  to be maintained.  The overall structure of dc is a stacking
	  (reverse Polish) calculator.	If an argument is given, input
	  is taken from that file until its end, then from the
	  standard input.  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
		negative number.  Numbers may contain decimal points.

	  + - / * % ^
		The top two values on the stack are added (+),
		subtracted (-), multiplied (*), divided (/),
		remaindered (%), or exponentiated (^).	The two
		entries are popped off the stack; the result is pushed
		on the stack in their place.  Any fractional part of
		an exponent is ignored.

	  sx	The top of the stack is popped and stored into a
		register named x, where x may be any character.	 If
		the s is capitalized, x is treated as a stack and the
		value is pushed on it.

	  lx	The value in register x is pushed on the stack.	 The
		register x is not altered.  All registers start with
		zero value.  If the l is capitalized, register x is
		treated as a stack and its top value is popped onto
		the main stack.

	  d	The top value on the stack is duplicated.

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

	  P	Interprets the top of the stack as an ASCII string,
		removes it, and prints it.

	  f	All values on the stack are printed.

	  q	Exits the program.  If executing a string, the
		recursion level is popped by two.  If q is

     Page 1					      (printed 2/7/91)

     DC(C)		      XENIX System V			 DC(C)

		capitalized, the top value on the stack is popped and
		the string execution level is popped by that value.

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

	  X	Replaces the number on the top of the stack with its
		scale factor.

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

	  <x   >x   =x
		The top two elements of the stack are popped and
		compared.  Register x is evaluated if they obey the
		stated relation.

	  v	Replaces the top element on the stack by its square
		root.  Any existing fractional part of the argument is
		taken into account, but otherwise the scale factor is
		ignored.

	  !	Interprets the rest of the line as a XENIX command.

	  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 of the stack is popped, and that value is used
		as a nonnegative scale factor; the appropriate number
		of places are printed on output, and maintained during
		multiplication, division, and exponentiation.  The
		interaction of scale factor, input base, and output
		base will be reasonable if all are changed together.

	  z	The stack level is pushed onto the stack.

	  Z	Replaces the number on the top of the stack with its
		length.

	  ?	A line of input is taken from the input source
		(usually the terminal) and executed.

     Page 2					      (printed 2/7/91)

     DC(C)		      XENIX System V			 DC(C)

	  ; :	Used by bc for array operations.

     Example
	  This example prints the first ten values of n!:

	     [la1+dsa*pla10>y]sy
	     0sa1
	     lyx

     See Also
	  bc(C)

     Diagnostics
	  x is unimplemented	   The octal number x corresponds to a
				   character that is not implemented
				   as a command

	  stack empty		   Not enough elements on the stack to
				   do what was asked

	  Out of space		   The free list is exhausted (too
				   many digits)

	  Out of headers	   Too many numbers being kept around

	  Out of pushdown	   Too many items on the stack

	  Nesting Depth		   Too many levels of nested execution

     Notes
	  bc is a preprocessor for dc, providing infix notation and a
	  C-like syntax which implements functions and reasonable
	  control structures for programs.  For interactive use, bc is
	  preferred to dc .

     Page 3					      (printed 2/7/91)

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