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how to write a Factorial program in PROLOG.

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So to Write A prolog programming .

First Fire up your SWI -PROLOG software.

then you will see something like this .



Welcome to SWI-Prolog (threaded, 64 bits, version 7.4.2)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
Please run ?- license. for legal details.

For online help and background, visit http://www.swi-prolog.org
For built-in help, use ?- help(Topic). or ?- apropos(Word).
?- _

1. So now go to File>NEW....
and give any name to knowledge base file. I Give it factorial
.pl


2. 




now write the follwing fact and rules .




fact(0,1) .

fact(N,R):- 
N>0, N1 is N-1,
fact(N1,R1),
R is N*R1.

now press ctrl +s to save  .


3. now close this windows .

4. now in the main window goto file > Consult.....
and select your factorial.pl


5. now you can type query like fact(5,X).
it will return X=120.
done.....


here are some screen shot :




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