diff --git a/src/Makefile b/src/Makefile
index 5c4c317..97ef93f 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,5 +1,5 @@
-# Import lib + compile + clean folder
-all: lib comp clean
+# Import lib + compile
+all: lib comp
 
 # Compilation of Ocaml files
 # Attention: order of object files important 
@@ -51,10 +51,14 @@ parser.cmo: parser.ml parser.cmi lang.cmo
 
 .PHONY: clean
 
-### Import files from /lib
+### Import files from /lib (temporarly)
 lib:
 	cp ../lib/* ./
 
 ## Remove compiled modules and lib
 clean:
 	rm -f lexer.ml parser.ml *.mli *.cmi *.cmo
+
+## Run tests
+tests:
+	./comp ./../tests/rectangles.c ./../tests/out/rectangles.ps
\ No newline at end of file
diff --git a/src/typing.ml b/src/typing.ml
index a47fb87..992cec0 100644
--- a/src/typing.ml
+++ b/src/typing.ml
@@ -8,31 +8,110 @@ type environment = {
     funbind: fundecl list   
 }
 
-let find_var (var: vname) (env: environment) =
-    let rec aux local_vars = 
-        match local_vars with
-        | [] -> failwith "Variable inconnue"
-        | tete::reste -> 
-            let (name, _) = tete in
-            if name = var
-            then tete
-            else aux reste
-    in aux (env.localvars)
+(* Recherche dans l'environement *)
+type 'a option = None| Some of 'a;;
+
+let lookup_env (name: vname) (env: environment) =
+    let rec aux = function
+    | [] -> None
+    | (k, v)::reste ->
+        if k = name then Some(v)
+        else aux(reste)
+    in aux(env.localvars)
 ;;
 
-(* let rec tp_expr (expression: expr) (env: environment) =
+(* Ajoute dans l'environement *)
+let rec add_env (key, valeur) env =
+    let paire = (key, valeur)
+    in {localvars: paire::(env.localvars); funbind: (env.funbind)}
+;;
+
+(* Enlève de l'environement *)
+let rec remove_env key env =
+    let aux (liste) = 
+    match liste with
+    | [] -> []
+    | (k, v)::reste when k = key -> remove_assoc key reste
+    | a::reste -> a::(remove_assoc key reste)
+    in {
+        localvars: (aux(env.localvars));
+        funbind: (env.funbind)
+    }
+;;
+
+(* Typage d'une expression *)
+let rec tp_expr (env: environment) (expression: expr) =
     match expression with
-    | Const(const) -> 
-        match const with
-        | BoolV(_) -> BoolT
-        | FloatV(_) -> FloatT
-        | IntV(_) -> IntT
-        | LitV(_) -> LitT
-        | StringV(_) -> StringT
-    | VarE(var) -> tp_expr (find_var var env) env
-    | BinOp(op, expr1, expr2) -> 
-    | CondE(expr1, expr2, expr3) -> 
-    | CallE(functionName, exprList) ->  *)
+    | Const(const) -> (
+      match const with
+      | BoolV _ -> BoolT
+      | FloatV _ -> FloatT
+      | IntV _ -> IntT
+      | LitV _ -> LitT
+      | StringV _ -> StringT
+      )
+    | VarE(var) -> (
+      let var_value = (lookup_env var env) in
+      match var_value with
+      | Some(value) -> value
+      | None -> raise (Failure "Unknown var")
+      )
+    | BinOp(op, expr1, expr2) ->
+        let tp_expr1 = tp_expr env expr1
+        and tp_expr2 = tp_expr env expr2 in
+        if tp_expr1 = tp_expr2
+        then match op with
+        | BArith(barith) -> (
+            match barith with
+            | BAadd -> IntT
+            | BAsub -> IntT
+            | BAmul -> IntT
+            | BAdiv -> IntT
+            | BAmod ->  IntT
+            | BAfadd -> FloatT 
+            | BAfsub -> FloatT
+            | BAfmul -> FloatT
+            | BAfdiv -> FloatT
+        )
+        | BBool(_) -> BoolT
+        | BCompar(_) -> BoolT
+        else raise (Failure "Invalid type of Binary operation")
+    | CondE(expr1, expr2, expr3) ->
+        let tp_expr1 = tp_expr env expr1
+        and tp_expr2 = tp_expr env expr2
+        and tp_expr3 = tp_expr env expr3
+        in if tp_expr1 = BoolT && tp_expr2 = tp_expr3
+        then tp_expr2
+        else raise (Failure "Invalid type of Conditionnal Expression")
+    | CallE(name, list_expr) -> VoidT (* TODO *)
+;;
+ 
+
+let rec tp_cmd (env: environment) (cmd: com) =
+    match cmd with
+    | Skip -> VoidT
+    | Exit -> VoidT
+    | Assign(name, expr) -> VoidT (* TODO ajouter dans env *)
+    | Seq(cmd1, cmd2) ->
+        let tp_cmd1 = (tp_cmd env cmd1)
+        and tp_cmd2 = (tp_cmd env cmd2)
+        in if tp_cmd1 = Void
+        then tp_cmd2
+        else raise (Failure "Invalid type Sequence")
+    | CondC(expr1, cmd1, cmd2) ->
+        let tp_expr1 = tp_expr env expr1
+        and tp_cmd1 = tp_cmd env cmd1
+        and tp_cmd2 = tp_cmd env cmd2
+        in
+        if tp_expr1 = BoolT && tp_cmd1 = tp_cmd2
+        then tp_cmd1
+        else raise (Failure "Invalid type of Conditionnal Command")
+    | Loop(cmd1) ->
+        let _ = (tp_cmd env cmd1)
+        in VoidT
+    | CallC(name, list_expr) -> VoidT (* TODO Faire l'appel *)
+    | Return(expr) -> (tp_expr env expr)
+  
 ;;
 
 let tp_prog (Prog (fundecls, fundefns)) = true
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