Re: [eclipse-clp-users] possible to turn strings into variable names?

From: Joachim Schimpf <joachim.schimpf_at_...44...>
Date: Thu, 11 Mar 2010 18:21:15 +1100
WL Ko wrote:
> I get what you mean, I guess I probably should have made myself clearer: I 
> would prefer to print out the original problem along with the solution, so 
> that I can tell at once it is SEND + MORE, and not _519_521_523_525 + 
> _527_529_531_521. In that case I would need something that can take in 
> "[S,E,N,D]+[M,O,R,E]=[M,O,N,E,Y]", and print:
>     SEND
> + MORE
> MONEY

You probably want something similar to the toplevel user interface.
To do that, you indeed need a string:

run_string(String) :-
	open(string(String), read, Stream),
	read_term(Stream, Goal, [variable_names(Vs)]),
	close(Stream),
	call(Goal),
	( foreach(V,Vs) do writeln(V) ).
	
The read_term/3 converts the string into a term, and also gives
you a list with the mapping of variable names to variables.

?- run_string("cryptarith([[S,E,N,D]+[M,O,R,E]=[M,O,N,E,Y]],10)").
would then print:
S = 9
E = 5
N = 6
D = 7
M = 1
O = 0
R = 8
Y = 2

(using example code http://eclipse-clp.org/examples/cryptarith.ecl)


-- Joachim
Received on Thu Mar 11 2010 - 07:21:23 CET

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