import Text.Read
import Text.ParserCombinators.ReadP hiding ((+++), choice)
-data Expr = Num Float
+data Expr = Num Double
| Var String
| BinOp BinOp Expr Expr
| Call String [Expr]
, parseVar
, parseCall
, parseBinOp "<" 10 (Cmp LT)
+ , parseBinOp ">" 10 (Cmp GT)
+ , parseBinOp "==" 10 (Cmp EQ)
, parseBinOp "+" 20 Add
, parseBinOp "-" 20 Sub
, parseBinOp "*" 40 Mul