`Yes, I understand. But not without complicating the calculation to keep`

`track of the number of times I have done multiplication in the current`

`result.`

Formating with current scale does not work.

: (format (* 9.9 9.789 9.56789) 20) -> "9272347445790000000000000000000000000000000.00000000000000000000"

`So in the example below I would have to track the number of arguments to`

`the * function. Then multiple that number against the current Scl value.`

`In the below would give me 3 * 20 giving 60 to scale the format. Is that`

`the best way to handle it? What if I have a a few dozen calculations`

`with multiples of arguments. Then do I do`

(format num 50000) ?

`And then significantly truncate the result to get the Scl number of`

`significant digits I wanted to track?`

(format (* 9.9 9.789 9.56789) 60) -> "927.234744579000000000000000000000000000000000000000000000000000" (round (* 9.9 9.789 9.56789)) -> "9,272,347,445,790,000,000,000,000,000,000,000,000,000,000.000" The decimal is not in the correct place.

`I didn't know if PicoLisp provided a solution without complicating every`

`function which uses multiplication and division.`

Thanks for the reply. Jimmie On 07/12/2017 01:05 PM, Aatos Heikkinen wrote:

I´ve found ´format´ and ´round´ functions quite helpful, seehttps://the-m6.net/blog/fixed-point-arithmetic-in-picolisp.htmlOn 12 Jul 2017 18:52, "Jimmie Houchin" <jlhouc...@gmail.com<mailto:jlhouc...@gmail.com>> wrote:Hello, I am trying to understand something about PicoLisp and Fixpoint numbers. I am writing an app and would consider PicoLisp should I get my head around Lisp. But I do not understand how to use numbers. I use a lot of floating point numbers and lots of calculations. From simple experiments it seems that the numbers and math appear to be accurate and correct. However I have no understanding of how to present a final result formatted correctly. Example: (setq *Scl 5) ;; or could be 10 ... (* 0.00009 0.0009) -> 81 >From another language: 0.0000000081 or: (setq *Scl 20) (* 9.9 9.789 9.56789) -> 927234744579000000000000000000000000000000000000000000000000000 >From another language 20 decimal points printed after converting to floating point: 927.23474457900010747835 The math looks fine as far as these simple examples go. But if I do several to dozens of different calculations with floating point numbers with unknown values until streamed to the app from some source. How do I know where the decimal point really belongs in order to format correctly for human use? Is it possible? I personally do not have a problem with fixpoint for internal use, as that is simply an implementation issue. However I do need to convert back to the best floating point representation for display or storage. Any help in understanding would be greatly appreciated. Thanks. Jimmie--UNSUBSCRIBE: mailto:picolisp@software-lab.de<mailto:picolisp@software-lab.de>?subject=Unsubscribe