Add tit4tat.pl

1 files changed, 34 insertions, 0 deletions

diff --git a/tit4tat.pl b/tit4tat.pl
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+++ b/tit4tat.pl
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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).
+
+loop(end).
+loop(OLD):- OLD\=end,
+	write('Type c,d or end to end: '), read(Word),
+	step(Word, OLD, PAY_A, PAY_B),
+	write('A Pay: '),write(PAY_A),nl, write('B Pay: '),write(PAY_B),nl,
+	loop(Word). 
+	
+start:-loop(c).