ch14ex02.pro

prolog,人工智能推理程序,运行环境prolog

/*
   Turbo Prolog 2.0 Chapter 14, Example Program 2
   
   Copyright (c) 1986, 88 by Borland International, Inc
   
*/
   
predicates
   start
   run(integer)
   do_sums
   set_up_windows
   clear_windows

clauses
   start :- set_up_windows, do_sums.

   set_up_windows :-
      makewindow(1, 7, 7, "", 0, 0, 25, 80),
      makewindow(1, 7, 7, "Left operand", 2, 5, 5, 25),
      makewindow(2, 7, 7, "", 2, 35, 5, 10),
      nl, write(" PLUS"),
      makewindow(2, 7, 7, "Right operand", 2, 50, 5, 25),
      makewindow(3, 7, 7, "Gives", 10, 27, 5, 25),
      makewindow(4, 7, 7, "", 17, 22, 5, 35).

   do_sums :- run(_), clear_windows, do_sums.

   run(Z) :-
      shiftwindow(1),
      cursor(2, 1), readint(X),
      shiftwindow(2),
      cursor(2, 10), readint(Y),
      shiftwindow(3), Z=X+Y, cursor(2, 10), write(Z),
      shiftwindow(4),
      write("  Please press the space bar"),
      readchar(_).

   clear_windows :-
      shiftwindow(1), clearwindow,
      shiftwindow(2), clearwindow,
      shiftwindow(3), clearwindow,
      shiftwindow(4), clearwindow.