diff --git a/src/main/c/Mathe.c b/src/main/c/Mathe.c
index 380cbdf..094750a 100644
--- a/src/main/c/Mathe.c
+++ b/src/main/c/Mathe.c
@@ -60,8 +60,8 @@ int generiereZufallszahl(int minimum, int maximum) {
 
 char generiereZufallsOperator() {
     char operatoren[] = {'+', '-', '*', '/'};
-    int index = rand() % 4;
-    return operatoren[index];
+    int indexnumber = rand() % 4;
+    return operatoren[indexnumber];
 }
 
 void zeigeAnleitung() {
diff --git a/src/main/c/a.exe b/src/main/c/a.exe
deleted file mode 100644
index e650f6d..0000000
Binary files a/src/main/c/a.exe and /dev/null differ