How to run the procedure given by the user?

[kamileo]

I would like to do the program in Prolog that allows its user to execute any procedure he wants to in that way:
1. The program reads from the keyboard the procedure that the user wants to execute (it's simple).
2. After that the Prolog sholud run that procedure. For example: user writes "some(thing)" and presses Enter. Now my program should execute in Prolog procedure some(thing). The problem is that I have no idea how to do it...

Regards,
Kamil

 

[kahleen]

You should go to the help page for the 'call' predicate.

Type help(call). at the Prolog prompt.

Or type help. and go to:

Built-in predicates
|
|
Meta-call predicates

... and perhaps you will find there more useful stuff ... but I think 'call' will do the job for you

 

[joel76]

Something like that :

?- read(A), term_to_atom(A, At), sub_atom(At, 0, 4, X, Y), term_to_atom(Y, At1), call(At1).
|: (func :- X is 6 + 4, write(X), nl).
10
A = (func:-_G1024 is 6+4,write(_G1024),nl),
At = 'func:-_G1024 is 6+4,write(_G1024),nl',
X = 32,
Y = func,
At1 = func.

You have to write the code that gives you the len of the head of the clause !