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1 files changed, 2 insertions, 0 deletions
-rw-r--r--Polymorphism/MathExpression/Expression.hpp2
diff --git a/Polymorphism/MathExpression/Expression.hpp b/Polymorphism/MathExpression/Expression.hpp
index dd344d8..4f09790 100644
--- a/Polymorphism/MathExpression/Expression.hpp
+++ b/Polymorphism/MathExpression/Expression.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
#include <iostream>
class Expression