字符常量和条件包含Character Constants and Conditional Inclusion

ANSI 3.8.1 控制条件包含的常量表达式中的单个字符的字符常量的值是否与执行字符集中的相同字符常量的值匹配。ANSI 3.8.1 Whether the value of a single-character character constant in a constant expression that controls conditional inclusion matches the value of the same character constant in the execution character set. 此类字符常量是否可具有负值Whether such a character constant can have a negative value

预处理器语句中使用的字符集与执行字符集相同。The character set used in preprocessor statements is the same as the execution character set. 预处理器识别负字符值。The preprocessor recognizes negative character values.

另请参阅See Also

预处理指令Preprocessing Directives