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/*
* Copyright (c) 2012 Benjamin Franzke <benjaminfranzke@googlemail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
pay(c,d,1).
pay(d,d,2).
pay(c,c,3).
pay(d,c,4).
step(A, B, PAY_A, PAY_B) :-
pay(A, B, PAY_A),
pay(B, A, PAY_B).
% Use opponents last decision
tit4tat_select(H,[H|_]).
% Fallback to coorporate at beginning
tit4tat_select(c,[]).
tit4tat(A, Hist, PayA, PayB) :-
tit4tat_select(Old, Hist),
step(A, Old, PayA, PayB).
loop(end, [_]).
loop(End, Hist):- End\=end,
write('Type c,d or end to end: '), read(Word),
tit4tat(Word, Hist, PAY_A, PAY_B),
write('A Pay: '),write(PAY_A),nl,
write('B Pay: '),write(PAY_B),nl,
loop(Word, [Word|Hist]).
start:-loop(noend, []).
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