A simple question, how would I go about declaring a clause which would produce the number specified +1 +2 and +3? I have tried:
addup(Thenumber,Thenumber+1).
add开发者_Python百科up(Thenumber,Thenumber+2).
addup(Thenumber,Thenumber+3).
but when I run it with say, Thenumber=5, it just returns 5+1 5+2 5+3. I have tried using 'is' to force it to evaluate but it doesn't seem to work. Any help would be appreciated.
Try this:
addup(X, Y) :- Y is X + 1.
or
addup(X, X+1).
and you question should be addup(2, X)
then X should be 3. If you want to parametrize your addup parameter just make it:
addup(X, Y, X + Y).
and ask with addup(5, 6, X).
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