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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

ANSI Conformance

Microsoft® C conforms to the standard for the C language as set forth in the 9899:1990 edition of the ANSI C standard.

Microsoft extensions to the ANSI C standard are noted in the text and syntax of this book as well as in the online reference. Because the extensions are not a part of the ANSI C standard, their use may restrict portability of programs between systems. By default, the Microsoft extensions are enabled. To disable the extensions, specify the /Za compiler option. With /Za, all non-ANSI code generates errors or warnings.

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