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Prolog problem to add two numbers

Posted By: Milind Mishra     Category: Artificial Intelligence     Views: 27369

Prolog problem to add two numbers.

?- start.
X= |: 1.
Y= |: 2.
Sum is 3
yes

Code for Prolog problem to add two numbers in Artificial Intelligence

predicates
    start.
    sum.    
clauses
          
        start:- sum,nl.
        
        sum:-     write("X= "),readreal(X),
            write("Y= "),readreal(Y),
            S = X+Y,
            write("Sum is "),write(S).

goal
    start.
  
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Milind Mishra
Milind Mishra author of Prolog problem to add two numbers is from India.
 
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Nitin Tripathi from United States Comment on: May 23
Hello Milind,
I am trying to learn PROLOG, and saw this code.

But in my case,
I can see the following output.
can you please elaborate the behavior.

[trace] [4] 257 ?- start.
Call: (30) start ? creep
Call: (31) sum ? creep
Exit: (31) sum ? creep
Call: (31) nl ? creep

Exit: (31) nl ? creep
Exit: (30) start ? creep
true .


While my code is as follow.

%predicates
start.
sum.
%clauses

start :- sum, nl.

sum :-
write("X = "),
readreal(X),
write("Y = "),
readreal(Y),
S = X + Y,
write("SUM is = "),
write(S).

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