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In this article
Changes the default char
type from signed char
to unsigned char
, and the char
type is zero-extended when it is widened to an int
type.
/J
If a char
value is explicitly declared as signed
, the /J option does not affect it, and the value is sign-extended when it is widened to an int
type.
The /J option defines _CHAR_UNSIGNED
, which is used with #ifndef
in the LIMITS.h file to define the range of the default char
type.
ANSI C and C++ do not require a specific implementation of the char
type. This option is useful when you are working with character data that will eventually be translated into a language other than English.
Note
If you use this compiler option with ATL/MFC, an error might be generated. Although you could disable this error by defining _ATL_ALLOW_CHAR_UNSIGNED
, this workaround is not supported and may not always work.
Open your project's Property Pages dialog box. For details, see Set C++ compiler and build properties in Visual Studio.
Select the Configuration Properties > C/C++ > Command Line property page.
In Additional Options, enter the /J compiler option.
MSVC Compiler Options
MSVC Compiler Command-Line Syntax
Set C++ compiler and build properties in Visual Studio