[ ECLiPSe Term Comparison built-in.|Group Index| Full Index]

?Term1 \== ?Term2

Succeeds if Term1 and Term2 are not identical terms.

+Term1
Prolog term.
+Term2
Prolog term.

Description

Used to compare the prolog terms Term1 with Term2. Succeeds if Term1 and Term2 are not identical terms. Two variables are considered as identical only if one is bound to the other one, or if they are bound to identical terms.

Fail Conditions

Fails if Term1 and Term2 are identical.

Resatisfiable

No.

Exceptions

Examples


Success:
   atom \== neutron.
   atom \== X.
   X \== atom.
   1 \== 1.0.
   X \== Y.
   [a|b] \== [a,b].
   [a|X] \== [a,X].
   f(a,b) \== [f,a,b].
   f(1,2,3) \== f(1,2,3.0).
Fail:
   a \== a.
   X \== X.
   X = Y, X \== Y.
   [a,b|[]] \== [a,b].


See Also

== / 2, \= / 2