diff --git a/sample/sample01.bas b/sample/sample01.bas
index 5d29428..9cefd8d 100755
--- a/sample/sample01.bas
+++ b/sample/sample01.bas
@@ -4,4 +4,4 @@
 
 s$ = "hello "
 s$ = s$ + "world"
-print s$ + "!"
\ No newline at end of file
+print s$ + "!"
diff --git a/sample/sample02.bas b/sample/sample02.bas
index f4723f5..fd65963 100755
--- a/sample/sample02.bas
+++ b/sample/sample02.bas
@@ -14,4 +14,4 @@ for n = 3 to e
 		if isp = 0 then exit
 	wend
 	if isp = 1 then print n, ", "
-next n
\ No newline at end of file
+next n
diff --git a/sample/sample03.bas b/sample/sample03.bas
index c91d797..4654718 100755
--- a/sample/sample03.bas
+++ b/sample/sample03.bas
@@ -19,4 +19,4 @@ for y = 5 to x step 2
 next
 a = a * 4
 
-print "Pi = ", a
\ No newline at end of file
+print "Pi = ", a
diff --git a/sample/sample04.bas b/sample/sample04.bas
index 2c2a068..2cb6654 100755
--- a/sample/sample04.bas
+++ b/sample/sample04.bas
@@ -20,4 +20,4 @@ show:
 	for i = 0 to n - 1
 		print arr(i), ", "
 	next
-return
\ No newline at end of file
+return
diff --git a/sample/sample05.bas b/sample/sample05.bas
index bf35a74..e260a52 100755
--- a/sample/sample05.bas
+++ b/sample/sample05.bas
@@ -12,4 +12,4 @@ enddef
 
 a = 3
 b = 4
-print a; b; area(a, b);
\ No newline at end of file
+print a; b; area(a, b);
diff --git a/sample/sample06.bas b/sample/sample06.bas
index f900a02..10eb9dd 100644
--- a/sample/sample06.bas
+++ b/sample/sample06.bas
@@ -3,25 +3,25 @@
 ' For more information, see https://github.com/paladin-t/my_basic/
 
 class animal
-    def speak(a)
-        print "default" + a;
-    enddef
+	def speak(a)
+		print "default" + a;
+	enddef
 endclass
 
 class cat(animal)
-    def speak(a)
-        print "meow" + a;
-    enddef
+	def speak(a)
+		print "meow" + a;
+	enddef
 endclass
 
 class dog(animal)
-    def speak(a)
-        print "bark" + a;
-    enddef
+	def speak(a)
+		print "bark" + a;
+	enddef
 endclass
 
 c = new(cat)
 d = new(dog)
 
 c.speak("!")
-d.speak("!")
\ No newline at end of file
+d.speak("!")