Character Constants and Conditional Inclusion

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The latest version of this topic can be found at Character Constants and Conditional Inclusion.

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. Whether such a character constant can have a negative value

The character set used in preprocessor statements is the same as the execution character set. The preprocessor recognizes negative character values.

Preprocessing Directives