Re: for loop in prolog

On 2006-01-16, Diogo Bastos <damrho@xxxxxxxxxx> wrote:
> % my_for(start_value,end_value,increment,action)
> my_for(V,V,_,_) :- !.
> my_for(Start,End,Inc,Action) :-
> End > Start,
> NewValue is Start+Inc,
> call(Action),
> my_for(NewValue,End,Inc,Action).

Nice, but if you want to go into the trouble of proving a start
and a step, you probable want to pass the current value to the action
predicate. The following however won't work:

?- my_for(0, 10, 1, writeln(X)).

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--- Jan

> "nobody" <nobody@xxxxxxxxxxxxxx> escreveu na mensagem
> news:pan.2006.01.10.19.29.18.959870@xxxxxxxxxxxxxxxxx
>> hi to all,
>>
>> How could i implement a for loop in prolog. Let's say for
>> example that i have an integer variable X and i want to repeat X
>> times a specific action. Any idea welcome...
>
>
.