Question

today i have talk with other friend ,he said he has logic programming skill , so I am very curious about that.

Answer 1

The wikipedia entry explains it well: while on the surface it seems a redundant terms since all programming uses logic, in practice it’s term for a well-defined paradigm, like, say, “functional programming” and “object-oriented programming”. Specifically,

logic programming, in the narrower
sense in which it is more commonly
understood, is the use of logic as
both a declarative and procedural
representation language. It is based
upon the fact that a backwards
reasoning theorem-prover applied to
declarative sentences in the form of
implications:

If B1 and … and Bn then H

treats the implications as
goal-reduction procedures:

to show/solve H, show/solve B1 and … and Bn.

The language Prolog (in some variant or other) is probably still the most popular logic programming language.