How can I dump an expression into log and execute it

[via Digitalmars-d]

On Monday, 14 July 2014 at 18:58:58 UTC, Ary Borenszweig wrote:
> I can't seem to learn anything about this language without 
> paying first.

Not much to learn, it is kinda like stack-based assembly, but 
useful knowledge if you want to generate Postscript. GNU appears 
to have a free version:

http://www.gnu.org/software/gforth/