diff --git a/src/main/c/Stefan/slot_machine.c b/src/main/c/Stefan/slot_machine.c
index dfddd13..4d1e33f 100644
--- a/src/main/c/Stefan/slot_machine.c
+++ b/src/main/c/Stefan/slot_machine.c
@@ -34,11 +34,17 @@ int userInput(){
 }
 
 int getBet(int balance){
-    int bet;
-    printf("Wetteinsatz: ");
-    bet = userInput();
 
-    return bet;
+    while(1){
+        printf("Wetteinsatz: ");
+        int bet = userInput();
+
+        if(bet <= balance && bet >= 0){
+            return bet;
+        } else {
+            printf("Ungueltige Eingabe!\n");
+        }
+    }
 }
 
 void welcomeMessage(){