| title |
auto Keyword | Microsoft Docs |
| ms.custom |
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| ms.date |
11/04/2016 |
| ms.reviewer |
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| ms.suite |
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| ms.technology |
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| ms.tgt_pltfrm |
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| ms.topic |
language-reference |
| f1_keywords |
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| helpviewer_keywords |
automatic storage class, auto keyword |
auto keyword |
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| ms.assetid |
744a41c0-2510-4140-a1be-96257e722908 |
| caps.latest.revision |
14 |
| author |
mikeblome |
| ms.author |
mblome |
| manager |
ghogen |
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The auto keyword is a declaration specifier. However, the C++ standard defines an original and a revised meaning for this keyword. Before Visual C++ 2010, the auto keyword declares a variable in the automatic storage class; that is, a variable that has a local lifetime. Starting with Visual C++ 2010, the auto keyword declares a variable whose type is deduced from the initialization expression in its declaration. The /Zc:auto[-] compiler option controls the meaning of the auto keyword.
auto declarator ;
auto declarator initializer;
Remarks
The definition of the auto keyword changes in the C++ programming language, but not in the C programming language.
The following topics describe the auto keyword and the corresponding compiler option:
Keywords