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title <cfenv> | Microsoft Docs
ms.custom
ms.date 11/04/2016
ms.technology
cpp-standard-libraries
ms.topic reference
dev_langs
C++
ms.assetid 6a17ad51-2182-4e91-8108-65997382acd3
author corob-msft
ms.author corob
ms.workload
cplusplus

<cfenv>

Includes the Standard C library header <fenv.h> and adds the associated names to the std namespace.

Syntax

#include <cfenv>

Remarks

Including this header ensures that the names declared using external linkage in the Standard C library header are declared in the std namespace.

See also

Header Files Reference
C++ Standard Library Overview
Thread Safety in the C++ Standard Library