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-rw-r--r--Makefile2
-rw-r--r--tit4tat.c59
2 files changed, 61 insertions, 0 deletions
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..cade429
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+tit4tat: tit4tat.c
+ gcc -std=c99 -Wall -o $@ $<
diff --git a/tit4tat.c b/tit4tat.c
new file mode 100644
index 0000000..fa3fe50
--- /dev/null
+++ b/tit4tat.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2012 Jan Klemkow <j.klemkow@wemelug.de>
+ * Copyright (c) 2012 Benjamin Franzke <benjaminfranzke@googlemail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+enum {COORPERATION, DEFECTION};
+
+int pay(int a, int b)
+{
+ if (a == COORPERATION && b == DEFECTION) return 1;
+ if (a == DEFECTION && b == DEFECTION) return 2;
+ if (a == COORPERATION && b == COORPERATION) return 3;
+ if (a == DEFECTION && b == COORPERATION) return 4;
+
+ exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv)
+{
+ int a_payment = 0, b_payment = 0;
+ int a, b, a_old = -1;
+
+ for (;;) {
+ /* human input */
+ a = getc(stdin);
+ fpurge(stdin);
+ a = (a == 'c') ? COORPERATION : DEFECTION;
+
+ /* computer rules */
+ b = (a_old == -1) ? COORPERATION : a_old;
+
+ a_payment += pay(a, b);
+ b_payment += pay(b, a);
+
+ printf("A: %d Euro\tB: %d Euro\t\t\tA: %d\tB: %d\n",
+ pay(a, b), pay(b, a), a_payment, b_payment);
+
+ /* save the last human decision */
+ a_old = a;
+ }
+
+ return EXIT_SUCCESS;
+}