diff --git a/du3/program.c b/du3/program.c
index 2bc685a..b2b6b38 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -7,28 +7,29 @@
 //kontrola, ze ci vycitane informacie su aritmeticky spravne
 bool IsArithmeticallyCorrect(int num1, int num2, char* op)
 {
-    if (num2 ==)
 
     switch (op)
     {
         case '-'
         if ((num1-num2) == resultTemp) { return true;}
+        break;
 
         case '+'
         if ((num1-num2) == resultTemp) { return true;}
+        break;
 
         case '*'
         if ((num1*num2) == resultTemp) { return true;}
+        break;
 
         case '/'
+        if (num2 == 0) { return false;
         if ((num1-num2) == resultTemp) { return true;}
+        break;
     }
 
-    return true;
-
-
-    //ak dopasovany arit. operator NIE je platny (resp ide o systematicku chybu, nie aritmeticku), vrati 0
     return false;
+
 }
 
 int main()