added not

[proglang.git] / Typecheck.hs

diff --git a/Typecheck.hs b/Typecheck.hs
index 2414203d7d81441d89080f3c3dc8d5486f140600..52f9816b07fdc277cdb385a70ed5c3b3588b849b 100644 (file)
--- a/Typecheck.hs
+++ b/Typecheck.hs
@@ -5,7 +5,6 @@ import Control.Monad.State
 import Data.Map as Map
 import Prelude hiding (lookup)
 
-
 type Types = Map Ident Type
 
 inList :: Eq a => a -> [a] -> Bool
@@ -41,7 +40,9 @@ typeCheckExp (EPost i op) = do
 typeCheckExp (ENeg e) = do
        TInt <- typeCheckExp e
        return TInt
-
+typeCheckExp (ENot e) = do
+       TBool <- typeCheckExp e
+       return TBool
 
 typeCheckVar :: (MonadState Types m) => Ident -> m Type 
 typeCheckVar i = do
@@ -77,4 +78,3 @@ typeCheckStm (SDecl t i e) = do
 typeCheckStm (SPrint e) = do
        typeCheckExp e
        return NoType
-