diff --git a/src/inputHandler.c b/src/inputHandler.c
index 47e5df1..f11f806 100644
--- a/src/inputHandler.c
+++ b/src/inputHandler.c
@@ -1,5 +1,5 @@
 #include "inputHandler.h"
-#include <string.h>
+#include <stdio.h>
 
 // return operation id for a specific symbol
 int getOperationIdBySymbol(char symbol) {
@@ -49,4 +49,10 @@ char getOperationSymbolById(int id) {
 int isOperationIdValid(int id) {
     if(id < 0 || id > 7) return 0;
     return 1;
+}
+
+int isNumberTooBig(int number) {
+    if(number < 200) return 0;
+    printf("Diese Nummer ist zu groß");
+    return 1;
 }
\ No newline at end of file
diff --git a/src/inputHandler.h b/src/inputHandler.h
index 6e4e4d5..372f9d0 100644
--- a/src/inputHandler.h
+++ b/src/inputHandler.h
@@ -7,4 +7,6 @@ char getOperationSymbolById(int);
 
 int isOperationIdValid(int);
 
+int isNumberTooBig(int);
+
 #endif //THEADMIRALS_INPUTHANDLER_H