-typeCheckExp (BExp e o e') = do
- TInt <- typeCheckExp e
- TInt <- typeCheckExp e'
- return TBool
-typeCheckExp (OpExp e o e') = do
- TInt <- typeCheckExp e
- TInt <- typeCheckExp e'
- return TInt
+typeCheckExp (BiOpExp e o e') = do
+ t1 <- typeCheckExp e
+ t2 <- typeCheckExp e'
+ if not(t1 == t2) then fail "The parameters for the binary operator aren't equal"
+ else if inList o [Eq,NEq] then return TBool
+ else if not(t1 == TInt) then fail "The parameters need to be of type int"
+ else if inList o [Plus,Minus,Times,Div]
+ then return TInt
+ else return TBool