An open-source calculator program
, available as a perl script
, that enables calculation of large numbers
that would overflow
libraries or any mortal
handheld calculator. It was originally a PalmPilot
and search for "HyperCalc" on site "edu.hk"
It represents numbers in floating-point
notation with as
many as 300 digits, and when the exponent
gets too large, it converts the number to a logarithm
Here is an example of using Hypercalc to compute the factorial
of the number of atoms
in the author's
Go ahead -- just TRY to make me overflow!
|_| . . ._ _ ._ _ ._ | _
| | | | | ) (-` | ( ,-| | (
~ ~ _7 |~ ~' ~ ~ `~` ~ ~
Enter expressions, or type 'help' for help.
C1 = weight = 102
R1: weight = 102
C2 = atoms = weight x 10^26
R2: atoms = 1.02 x 10 ^ 28
C3 = r2 !
R3: 10 ^ ( 2.8125791803656 x 10 ^ 29 )
C4 = 27^weight^atoms
R4: 10 ^ ( 10 ^ ( 2.0487721751971 x 10 ^ 28 ) )
C5 = 27^42^weight^atoms
R5: 3 PT ( 2.0487721751971 x 10 ^ 28 )
In the last result, "3 PT" means "3 powers of 10". It is an interesting exercise
to convince yourself why R5 appears to be the same as 10 to the power of R4.
To find the Hypercalc source code
on the web
, use a search engine
and search for the string "pt_addpos", or "hypercalc interpreted calculator overflow".
Copyright © 2001-2008 Robert Munafo. Robert Munafo is mrob27.