Re: Floating point issue in sbcl 1.0.10?

On Wed, Oct 31 2007, steven.w.levine@xxxxxxxxx wrote:

As a lisp newbie, I'm sorry if this one is obvious. However, I'm a
bit puzzled by the following executed from the prompt:

* (- 1234.56 4.57)

1229.9901

Your question is ambiguous - are you asking about the floating point
precision or about multiplication not happening?

Rainer answered in the former question so I will answer the latter:

The following:

* (- 1234.56 4.57)

when written in the REPL:

1. Evaluates the variable *
2. Evaluates the provided FP form
3. Prints the result of the last form

If you want to do multiplication you should use the function * this
way:

(* (- 1234.56 4.57) 3)

The symbol * is a variable. You can learn about it here:

http://www.lisp.org/HyperSpec/Body/var_stcm_ststcm_ststst.html


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