diff --git a/stringCalculator.py b/stringCalculator.py
index 4cbd27b8355332f0580ece154b403901d4144760..b4dacadf65eaf8edd36c74f14d286f5452fef439 100644
--- a/stringCalculator.py
+++ b/stringCalculator.py
@@ -31,6 +31,10 @@ class StringCalculator(IStringCalculator):
         '''Nur 2 Werte sollen miteinander multipliziert werden'''
         if len(list)>2:
             return "only two numbers allowed"
+        
+        for num in list:
+            if "." in num:
+                return "only integers allowed"
 
         '''Konvertirung von Strings zu Integer'''
         result = 0
@@ -64,5 +68,9 @@ class TestStringCalculator(unittest.TestCase):
         res = self.c.add("1,2,3")
         self.assertEqual(res, "only two numbers allowed")
 
+    def test_handleFloat(self):
+        res = self.c.add("3.5")
+        self.assertEqual(res, "only integers allowed")
+
 if __name__ == "__main__":
     unittest.main()
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