• The CLP recognizes' null '(specified in uppercase characters) as a null string. For example.

    CLP将“NULL”(大写字符指定)识别字符串。

    www.ibm.com

  • It returns a null if no match is found, or if the source string is null or empty.

    如果没有发现匹配项字符串null则返回null

    www.ibm.com

  • It returns null if the source string is null or empty.

    如果字符串null空,则返回null

    www.ibm.com

  • Both null and undefined macros expand to null strings, but a macro defined as a null string is considered defined in preprocessing expressions.

    定义的宏展开为空字符串定义字符串的宏被视为预处理表达式中定义的。

    technet.microsoft.com

  • Both null and undefined macros expand to null strings, but a macro defined as a null string is considered defined in preprocessing expressions.

    定义的宏展开为空字符串定义字符串的宏被视为预处理表达式中定义的。

    technet.microsoft.com

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