Re: pi seems not to be a constant
"Pascal J. Bourguignon" <[email protected]>
| Newsgroups | gmane.lisp.clisp.general |
|---|---|
| Organization | Informatimago |
| Message-ID | <[email protected]> |
On 16/10/15 09:21, Don Cohen wrote: > [1]> (lisp-implementation-version) ; built from current source > "2.49+ (2010-07-17) (built 3653902709) (memory 3653902846)" > [2]> (constantp 'pi) ; I think this should return T > NIL > [3]> (defconstant pi2 pi) > PI2 > [4]> (constantp 'pi2) > T > [5]> > The problem is that in clisp, CL:PI is not constant [1]> pi 3.1415926535897932385L0 [2]> (setf (ext:long-float-digits) 1000) 1000 [3]> pi 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273724587L0 [4]> Conformity could be restored by having CL:PI defined as a constant variable bound to double-float π, and to have another variable EXT:PI bound to the changing long-float π value. -- __Pascal J. Bourguignon__ http://www.informatimago.com/ ------------------------------------------------------------------------------ _______________________________________________ clisp-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/clisp-list