Ctype.h
ctype.h is the C standard header declaring character-classification and character-case-conversion functions and macros.
Modern C, Third Edition
ctype.h is the C standard header that declares character classification and character-case conversion facilities.
- How it is used
- Provides encoding-aware character classification and case conversion within C string processing.
- How deep it goes
- Defines classifier categories, argument types, conversion behavior, locale extensions, and a worked hexadecimal-digit conversion.
- Examples
- Demonstrates hexadecimal-digit conversion using isdigit, toupper, and isupper, alongside character and string escape examples.
- What you can do after
- Apply it via <ctype.h> classifiers and conversions to recognize character classes and normalize alphabetic input.
Modern C
ctype.h is the C standard header declaring character classification and character-case conversion functions and macros.
- How it is used
- Provides encoding-independent character classification and case conversion for string processing.
- How deep it goes
- Defines the classifier families and demonstrates their composition, but defers a complete interface specification.
- Examples
- Uses a base-36 digit converter and a table of classifier meanings, including C-locale and extended-character cases.
- What you can do after
- Apply it via ctype.h to classify characters and normalize alphabetic case during parsing or conversion.
Related concepts
- character classifieruses · A character classifier is a C library function or macro that tests whether a character value belongs to a specified character class.
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