diff --git a/Calc.py b/Calc.py
index 24c2188..2269cd4 100644
--- a/Calc.py
+++ b/Calc.py
@@ -1,3 +1,4 @@
+import tkinter as tk
 from Pile import Pile_chaine
 
 class Expression:
@@ -42,10 +43,30 @@ def npi2tree(ch):
             Expr.empiler(Expression(int(elmt), None, None))
     return Expr.sommet()
     
+def calculer():
+    expression = entry.get()
+    try:
+        resultat = npi2tree(expression).evalue()
+        result_label.config(text="Résultat: " + str(resultat))
+    except Exception as erreur:
+        result_label.config(text="Erreur: " + str(erreur))
 
-    
-ch1 = '7 4 3 * +'
-exp = npi2tree(ch1)
+root = tk.Tk()
+root.title("Calculatrice rudimentaire")
+
+message_label = tk.Label(root, text="Le calcul doit être écrit en notation polonaise inversée")
+message_label.pack()
+
+entry = tk.Entry(root, width=30)
+entry.pack(pady=10)
+
+evaluate_button = tk.Button(root, text="Calculer", command=calculer)
+evaluate_button.pack()
+
+result_label = tk.Label(root, text="")
+result_label.pack(pady=10)
+
+root.mainloop()