diff --git a/c0check.cabal b/c0check.cabal
--- a/c0check.cabal
+++ b/c0check.cabal
@@ -1,10 +1,10 @@
 Name:                c0check
-Version:             0.1
+Version:             0.2
 Synopsis:            Simple C0 Syntax Check
 Description:         The package contains a progam to check if your C-Program is valid C0. 
-	             The C0-language is introduced in the basic programming course \"Algorithmisches Denken und imperative Programmierung\" (WS 2011/12 and later) at the University of Bonn.
+	             The C0-language is introduced in the basic programming course \"Algorithmisches Denken und imperative Programmierung\" (WS 2012/13 and later) at the University of Bonn.
                      The program contained in the package will take a C source code file and test the content if it is conform to the C0-language specifications. 
-                     The answer is simply yes or no.
+                     If not it points to the non-conformant code part.
 License:             GPL
 Author:              Daniel Seidel
 Maintainer:          ds@iai.uni-bonn.de
@@ -16,4 +16,4 @@
 Executable c0check
   Main-is:           src/c0check.hs
   Build-Depends:     base >= 3 && < 6,
-                     c0parser
+                     c0parser >= 0.2
diff --git a/src/c0check.hs b/src/c0check.hs
--- a/src/c0check.hs
+++ b/src/c0check.hs
@@ -1,16 +1,16 @@
 module Main where
 
 import System.Environment (getArgs)
-import Language.C0.Parser.C0Parser (yesNo)
+import Language.C0.Parser.C0Parser (parseProg)
 
 checkFile fn = do
   input <- readFile fn
   putStr "Folgendes Programm wurde gelesen:\n\n"
   putStr input
   putStr "\n\n"
-  case yesNo input of
-    True  -> putStr "Ihr Programm ist syntaktisch korrektes C0."
-    False -> putStr "Das getestete Programm ist *kein* C0-Programm."
+  case parseProg input of
+    Left err -> error (show err)
+    Right _  -> putStr "Ihr Programm ist syntaktisch korrektes C0."
   putStr "\n\n"