Character classifier
A character classifier is a C library function or macro that tests whether a character value belongs to a specified character class.
Modern C, Third Edition
A character classifier function is a C library interface that tests whether a character belongs to a specified character class.
- How it is used
- Supports encoding-independent character classification during string processing and conversion.
- How deep it goes
- Defines the classifier family, int-based interface, class meanings, and locale extensions without detailing implementation internals.
- Examples
- Uses decimal, hexadecimal, alphabetic, uppercase, whitespace, punctuation, control, graphical, and printable character classes.
- What you can do after
- Apply it via <ctype.h> to test character classes and branch safely in conversion routines.
Read how Modern C, Third Edition explains character classifier →
Modern C
A character classifier is a C library function or macro that tests whether a character belongs to a specified character class.
- How it is used
- Supports encoding-independent character testing and numeric-string processing.
- How deep it goes
- Defines the classifier families and demonstrates their use, but defers broader library-interface details.
- Examples
- Uses a classifier table and a hexatridecimal conversion function to demonstrate classification before arithmetic.
- What you can do after
- Apply <ctype.h> predicates to classify characters during portable parsing and conversion.
Related concepts
- ctype.hused by · ctype.h is the C standard header declaring character-classification and character-case-conversion functions and macros.
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