diff --git a/misc/window.py b/misc/window.py
index e7108f9..b2f88a4 100644
--- a/misc/window.py
+++ b/misc/window.py
@@ -1,13 +1,14 @@
-from tkinter import Tk, Button, Label, StringVar
+from tkinter import Tk, Button, Label, StringVar, Entry
 from misc.parser import *
 from misc.tokenizer import *
+from lib.File import File_chaine as File
 
 class Window(Tk):
 
     def __init__(self):
         Tk.__init__(self)
         self.title("test")
-        self.geometry("400x500")
+        self.geometry("500x600")
         self.resizable(False, False)
 
         self.layout()
@@ -15,11 +16,16 @@ class Window(Tk):
     def layout(self):
         #TEXT
         self.text = StringVar(value="")
-        self.label = Label(textvariable=self.text, background="#eaeaea", borderwidth=2, relief="solid", font=("Arial", 20))
-        self.label.pack(fill="x")#.place(x=0, y=0)
+        self.label = Label(textvariable=self.text, background="#eaeaea", font=("Arial", 20))
+        self.label.pack(fill="x")
+
+        self.input = Entry(textvariable=self.text)
+        self.input.pack(fill="x")
+
+        Label(text="Pensez aux parenthèses et à utiliser des espaces avec EVAL_NPI", font=("Arial", 11)).pack(fill='x')
 
         #BOUTTONS
-        bouttons = ["1", "2", "3", "+", "-", "4", "5", "6", "*", "/", "7", "8", "9", "^", "sqrt", "EVAL", "0", "DEL", "CLEAR", "exp", "(", ")", ".", "sin", "cos"]
+        bouttons = ["1", "2", "3", "+", "-", "4", "5", "6", "*", "/", "7", "8", "9", "^", "sqrt", "EVAL", "0", "DEL", "CLEAR", "exp", "(", ")", ".", "sin", "cos", "EVAL_NPI", "ESPACE"]
         col = 0
         row = 0
         for b in bouttons:
@@ -34,10 +40,14 @@ class Window(Tk):
                 cmd = self.delete
             elif b == "CLEAR":
                 cmd = self.clear
+            elif b == "EVAL_NPI":
+                cmd = self.evalue_npi
+            elif b == "ESPACE":
+                cmd = lambda: self.write(" ")
             else:
                 cmd = lambda text = b: self.write(str(text))
 
-            Button(self, text=b, width=5, height=1, command=cmd).place(x=40+50*col, y=250+30*row)
+            Button(self, text=b, width=6, height=1, command=cmd).place(x=10+100*col, y=100+40*row)
 
             col += 1
     
@@ -52,6 +62,17 @@ class Window(Tk):
     def clear(self):
         self.text.set("")
     
+    def evalue_npi(self):
+        try:
+            tokens = tokenize(self.text.get())
+            file = File()
+            for token in tokens:
+                file.enfiler(token)
+            exp = npi2tree(file)
+            self.text.set(exp.evalue())
+        except:
+            self.text.set("Erreur NPI")
+
     def evalue(self):
         try:
             exp = npi2tree(shutting_yard(tokenize(self.text.get())))