Power function in prolog

Question

Exactly what's the prolog definition for power function. I wrote this code and it give some errors I wanna know exact code for the power function.

pow(X,0,1).

pow(X,Y,Z):-Y1=Y-1,pow(X,Y1,Z1),Z1=Z*X.

Anything wrong with this code?

Answer 1

Have a look here - http://stackoverflow.com/questions/1448790/power-function-in-prolog. The built-in pow predicate is not implemented in prolog for efficiency reason - as most arithmetic predicates.