Why am I getting the wrong output?

Question

code:-
program :- write((3+4)).
:- program.

output:-
3+4

Answer 1

No the output is right.
Try using variable

Answer 2

I have tried using but there is an error
see it:-
X is 3*4.
program :- write(X).
:- program.

and:-
X = 3*4.
program :- write(X).
:- program.

and:-
X is 3*4.
X = 12.
program :- write(X).
:- program.

Answer 3

Sorry what u want for output?

Answer 4

Value of X.
In swi-prolog I am getting __18..something.
while the value of X is 12

Answer 5

start:- sum,nl.

sum:- write('X= '),read(X),
write('Y= '),read(Y),
S is X+Y,
write('Sum is '),write(S).

Is that help?