diff --git a/samples/addition.lox b/samples/addition.lox
deleted file mode 100644
index 4fc8bc9..0000000
--- a/samples/addition.lox
+++ /dev/null
@@ -1 +0,0 @@
-true+false
\ No newline at end of file
diff --git a/samples/ch21_print.lox b/samples/ch21_print.lox
new file mode 100644
index 0000000..d7487c8
--- /dev/null
+++ b/samples/ch21_print.lox
@@ -0,0 +1,6 @@
+print 1 + 2;
+print 3 * 4;
+print (1+1)*2;
+print "true" == "false";
+print nil == nil;
+print !(5 - 4 > 3 * 2 == !nil);