7.1.1. var, nonvar, atom, integer, float, number, atomic, compound
: , , .. , . , , , .. , . , , X Y, :
Z is X + Y
, X Y . , Y , .
number. number (X) , X , . , X " " . , , X Y, ( ) X Y:..., number! X), number (Yj', Z is X + Y,...
X, Y , . number "" 2 is + V ,
var, nonvar, atom, integer, float, number, atomic, compound. .
var{ X). , X -.
nonvar (X). , X ■ X .
atom(X). , X .
integer (X). , X .
float [X). , .
number (X). , X .
atomic (X). , X .
compound (X). , X ().
Prolog .
?- var (Z), Z = 2.
Z = 2
?- Z = 2, var(Z).
no
1- integer(Z), S = 2.
no
?- z = 2, integer[ z), nonvar[ z),
z - >
?- atom! 3.14).
no
?- atomic; 3.14).
yes
?- ata(== >;.
yes
?- ato(pd)). no
?- compound (2 + X)
yes
I. Prolog
atom . , , . :
|
|
|
count! A, L, )
, L , N . count :
count!, [], 0).
count [~Ar [AIL], ):-!,
count! A, L, N1), % HI N is N1 + 1. count! A, L 1 L], N):-count! A, L, .
:
?- count! , rarb,a,a], H). N = 3
?- count (a, [a,b,X,Y], Nat. - 3
?- count! , [a,b,X,Y], lib). Mb = 3
?- L = [, , X, ], count! a, L, Na), count [ , L, Nb).
Na = 3 Nb = 1
Y=a
X, Y , , a, = 1, . , , . count , . .
count (, [ | L], : -
atom! ), = ,!, % ?
count! a. Lr N1), \ ,
is Mi + 1
count (A, L, N). %
, nonvar.
