38. %%%==================================== %%% gensnum( Root, Atom ) %%% %%% ==> generate number of sentence %%%==================================== gensnum(Root, Atom) :- get_snum(Root, Num), name(Root, Name1), get_integer(Num, Name2), append(Name1, Name2, Name), name(Atom, Name). get_snum(Root, Num) :- retract(current_num(Root, Num1)), !, Num is Num1+1, asserta(current_num(Root, Num)). get_snum(Root, 1) :- asserta(current_num(Root, 1)). /* first time for this root */ /* Convert from an integer to a list of characters */ get_integer(Int, List) :- get_integer(Int, [], List). get_integer(I, Sofar, [C| Sofar]) :- I<10, !, C is I+48. get_integer(I, Sofar, List) :- Tophalf is I//10, Bothalf is I mod 10, C is Bothalf+48, get_integer(Tophalf, [C| Sofar], List).
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