From f03784b6c1c9f0eff925f0aaef5c401edc2cc40c Mon Sep 17 00:00:00 2001
From: Sergii Piatakov <sergii.piatakov@globallogic.com>
Date: Thu, 15 Nov 2018 15:11:37 +0200
Subject: [PATCH] add header guard

The current implementation does not contain guard and it works well,
but it may lead to problems in the future.

Signed-off-by: Sergii Piatakov <sergii.piatakov@globallogic.com>
---
 calculator.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/calculator.h b/calculator.h
index 6b87fdc..5813ec9 100644
--- a/calculator.h
+++ b/calculator.h
@@ -1,5 +1,10 @@
+#ifndef CALCULATOR_H
+#define CALCULATOR_H
+
 class Calculator
 {
     public:
         int Add (int, int);
 };
+
+#endif//CALCULATOR_H