Consulting a Prolog file from within a C++ solution file

This is a discussion on Consulting a Prolog file from within a C++ solution file within the C++ Programming forums, part of the General Programming Boards category; I have a Prolog file (Hanoi.pl) containing the code for solving the Hanoi Towers puzzle: hanoi( N ):- move( N, ...

  1. #1
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    Consulting a Prolog file from within a C++ solution file

    I have a Prolog file (Hanoi.pl) containing the code for solving the Hanoi Towers puzzle:

    hanoi( N ):-
    move( N, left, middle, right ).

    move( 0, _, _, _ ):-
    !.

    move( N, A, B, C ):-
    M is N-1,
    move( M, A, C, B ),
    inform( A, B ),
    move( M, C, B, A ).

    inform( X, Y ):-
    write( 'move a disk from ' ),
    write( X ),
    write( ' to ' ),
    writeln( Y ).

    I also have a C++ file written in VS2008 IDE:

    #include <iostream>
    #include <string>
    #include <stdio.h>
    #include <stdlib.h>
    using namespace std;
    #include "SWI-cpp.h"
    #include "SWI-Prolog.h"

    predicate_t phanoi;
    term_t t0;

    int main(int argc, char** argv)
    {
    long n = 5;
    int rval;

    if ( !PL_initialise(1, argv) )
    PL_halt(1);

    PL_put_integer( t0, n );

    phanoi = PL_predicate( "hanoi", 1, NULL );

    rval = PL_call_predicate( NULL, PL_Q_NORMAL, phanoi, t0 );

    system( "PAUSE" );
    }

    How can I consult my Prolog source code (Hanoi.pl) from within my C++ code? Not from the Command Prompt - from the code, something like include or consult or compile? It is located in the same folder as my cpp file.

    Thanks,

  2. #2
    and the hat of wrongness Salem's Avatar
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    What do you mean 'consult' ?

    It's just a regular text file isn't it?
    You just load it as if you were loading a .txt file

    File->Open File...
    Show all file types.
    select the .pl file.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
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    By 'consult' I mean compiling my Prolog program.

    The program return something when you type in, say, hanoi(5).



    hanoi( N ):-
    move( N, left, middle, right ).

    move( 0, _, _, _ ):-
    !.
    move( N, A, B, C ):-
    M is N-1,
    move( M, A, C, B ),
    inform( A, B ),
    move( M, C, B, A ).

    inform( X, Y ):-
    write( 'move a disk from ' ),
    write( X ),
    write( ' to ' ),
    writeln( Y ).


    I wanna make this call from within my C++ program:


    #include "SWI-cpp.h"
    #include "SWI-Prolog.h"

    predicate_t phanoi;
    term_t t0;

    int main(int argc, char** argv)
    {
    long n = 5;
    int rval;

    PL_put_integer( t0, n );

    phanoi = PL_predicate( "hanoi", 1, NULL );

    rval = PL_call_predicate( NULL, PL_Q_NORMAL, phanoi, t0 );
    }


    How can I consult my Prolog source code from within VS2008?

    What should I add to the above C++ code in order to 'read' my Prolog program, pass the integer 5 to it, get the result of hanoi(5), and pass it back to C++ for processing (e.g. writing to console, etc...)

    Thanks Salem,

  4. #4
    and the hat of wrongness Salem's Avatar
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    We've done all this in all your other prolog/c++ threads.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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