diff --git a/src/fakultaet.c b/src/fakultaet.c
index e057620..46d9f0f 100644
--- a/src/fakultaet.c
+++ b/src/fakultaet.c
@@ -12,6 +12,14 @@ int berechneFakultaetInt(int zahl) {
     }
 }
 
-double berechneFakultaetDouble(double a, double b) {
-    return 0;
+int berechneFakultaetDouble(double zahl) {
+    if (zahl == 0 || zahl == 1) {
+        return 1;
+    } else {
+        double fakultaet = 1;
+        for (double i = 2; i <= zahl; ++i) {
+            fakultaet *= i;
+        }
+        return fakultaet;
+    }
 }