diff --git a/src/operationHandler.c b/src/operationHandler.c
new file mode 100644
index 0000000..0f63fb7
--- /dev/null
+++ b/src/operationHandler.c
@@ -0,0 +1,10 @@
+#include "operationHandler.h"
+#include <stdbool.h>
+
+bool checkOperationInput(int input) {
+    switch (input) {
+        case 4: case 3: case 2: case 1:
+            return true;
+    }
+    return false;
+}
\ No newline at end of file
diff --git a/src/operationHandler.h b/src/operationHandler.h
new file mode 100644
index 0000000..5293b1e
--- /dev/null
+++ b/src/operationHandler.h
@@ -0,0 +1,7 @@
+#ifndef THEADMIRALS_OPERATIONHANDLER_H
+#define THEADMIRALS_OPERATIONHANDLER_H
+#include <stdbool.h>
+
+bool checkOperationInput(int);
+
+#endif //THEADMIRALS_OPERATIONHANDLER_H