y0-y1-yn.md

description	Learn more about: y0, y1, yn
title	y0, y1, yn
ms.date	12/16/2019
api_name	y1 yn y0
api_location	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll
api_type	DLLExport
topic_type	apiref
f1_keywords	CORECRT_MATH/yn CORECRT_MATH/y1 CORECRT_MATH/y0 yn y1 y0
helpviewer_keywords	y0 function y1 function yn function
ms.assetid	e14215f3-53d4-4ae8-816e-4c1ec2019316

y0, y1, yn

The Microsoft-implemented POSIX function names y0, y1, and yn are deprecated aliases for the _y0, _y1, and _yn functions. By default, they generate Compiler warning (level 3) C4996. The names are deprecated because they don't follow the Standard C rules for implementation-specific names. However, the functions are still supported.

We recommend you use _y0, _y1, and _yn instead. Or, you can continue to use these function names, and disable the warning. For more information, see Turn off the warning and POSIX function names.