If-then-else

alley

Hello,

Can someone please explain to me how the if-then-else in Prolog works?

I'm trying this but I must be doing something wrong:

found(X,.(X,Y)) :- true, write(X), ! ; found('Not Found').
found(X,.(Y,Z)) :- found(X,Z).

If X is found in the list Y, it will print X, else it should print 'Not Found'.

What am I doing wrong?

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1 24th March 15:01 alley Miembro Mombu User Join Date: Mar 2008 Location: Malta Posts: 1	If-then-else Hello, Can someone please explain to me how the if-then-else in Prolog works? I'm trying this but I must be doing something wrong: found(X,.(X,Y)) :- true, write(X), ! ; found('Not Found'). found(X,.(Y,Z)) :- found(X,Z). If X is found in the list Y, it will print X, else it should print 'Not Found'. What am I doing wrong?