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                         CALC v2.24

                   (C) 1987 Eric Hammond

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CALC                                                         CALC



CALC -- interactive multi-base expression evaluator.

usage:
     CALC

description:
     CALC is a program which will  evaluate numerical expressions
     in any base and convert the answer to any base.  The default
     input and output bases are  both  10.   Currently  CALC  can
     evaluate expressions involving parentheses and the following
     operators in the indicated precedence:

          1.   ( )
          2.   !      (factorial)
          3.   -      (unary negation)
          4.   **     (exponentiation - left to right)
          5.   * / %  (mult, division, modulus - left to right)
          6.   + -    (addition, subtraction - left to right)
          7.   &      (bitwise and)
          8.   | ^    (bitwise or, bitwise xor - left to right)

     Division is integer  division (decimal  part is  truncated).
     Negative  numbers are displayed with a minus (-) in  decimal 
     and in two's complement in any other base.  Numbers are also
     converted to two's complement for bitwise operations.  Extra
     whitespace is ignored by CALC and case is of no importance.

     The  largest  integer  value that CALC  can  handle  may  be 
     determined by evaluating the following expression:

             0|-1

commands:
     I nn    The I command  is  used  to  set  the   input  radix
             (base). This will be reflected in the prompt string.

     O nn    The O command  is  used  to  set  the  output  radix 
             (base).  This will be reflected  in  the  evaluation
             string.

     expr    If your input  line  starts  with  one  of  '0'-'9',  
             'A'-'F',   '(',  '-',  CALC  will  assume  it  is  a 
             mathematical  expression, and will try  to  evaluate 
             it.

     P expr  This  is  the same as the previous except that  CALC
             will  also  display  the  postfix  notation  of  the 
             expression.

     R expr  This  allows  you  to  evaluate  an   RPN  (postfix) 
             expression.  The argument expr should be in RPN.

     ?       For a short list of the commands type ? at the input
             prompt.

     X       eXit CALC.


CALC                                                         CALC



example:
     C> CALC

     Calc v2.23

     Type '?' for help.

     [10] : I 16
     Input radix set to 16

     [16] : O 2
     Output radix set to 2

     [16] : 5*(A-8)+3/2
     [ 2] = 1011

     [16] : O 10
     Output radix set to 10

     [16] : 0 | -1
     [10] = 340282366920938463463374607431768211455

     [16] : X

     C> _

caveats:
     * CALC will only accept and return integers.

plans for future versions:
     * Handling of floating point numbers.

     * Your suggestions.


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Version history of CALC:

   01/  /87      1.00   Original version written in VAX Pascal.
   :             :      :
   06/  /87      2.00   Converted to MS-DOS Turbo Pascal.
   :             :      :
   06/30/87      2.20   Added capabilities for large numbers.
                        Several bugs fixed.
   06/30/87      2.21   Added unary negation.
   06/30/87      2.22   Added factorial operator.
   07/10/87      2.23   Converted to CP/M Turbo Pascal.
                        Fixed minor bugs.
   07/12/87      2.24   Fixed long multiplication algorythm.

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Feel free to copy CALC and pass it on to others.  If you have any
questions, comments, suggestions, or  have   found  any  bugs  in
CALC, please contact:

     Eric Hammond
     10040 Daly Rd.
     Cincinnati, OH 45231

Or, leave  a message to Eric Hammond  on  the  Cincinnati Osborne
Group (COG) MBBS RCP/M.   513/481-1417  (2400/1200/300, 8, N, 1).

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