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The wctype.h header file is part of the standard C library, defining various functions and macros for classifying and mapping wide characters. It declares the types wint_t and wctype_t.
Library Macros
Following are the macros defined in the header wctype.h −
| Sr.No. | Macro & Description |
|---|---|
| 1 |
WEOF
This is a non-character value of type wint_t used to indicate errors.
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| 2 |
WCHAR_MIN
The smallest valid value of wchar_t.
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| 3 |
WCHAR_MAX
The largest valid value of wchar_t.
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Library Functions
Following are the functions defined in the header wctype.h −
| Sr.No. | Function & Description |
|---|---|
| 1 |
int iswalnum( wint_t ch ) This function checks if a wide character is alphanumeric.
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| 2 |
int iswalpha( wint_t ch ) This function checks if a wide character is alphabetic.
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| 3 |
int iswlower( wint_t ch ) This function checks if a wide character is an lowercase character.
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| 4 |
int iswupper( wint_t ch ) This function checks if a wide character is an uppercase character.
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| 5 |
int iswdigit( wint_t ch ) This function checks if a wide character is a digit.
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| 6 |
int iswxdigit( wint_t ch ) This function checks if a wide character is a hexadecimal character.
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| 7 |
int iswcntrl( wint_t ch ) This function checks if a wide character is a control character.
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| 8 |
int iswgraph( wint_t ch ) This function checks if a wide character is a graphical character.
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| 9 |
int iswspace( wint_t ch ) This function checks if a wide character is a space character.
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| 10 |
int iswblank( wint_t ch ) This function checks if a wide character is a blank character.
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| 11 |
int iswprint( wint_t ch ) This function checks if a wide character is a printing character.
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| 12 |
int iswpunct( wint_t ch ) This function checks if a wide character is a punctuation character.
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| 13 |
int iswctype( wint_t wc, wctype_t desc ) This function classifies a wide character according to the specified LC_CTYPE category.
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| 14 |
wctype_t wctype( const char* str ) This function looks up a character classification category in the current C locale.
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| 15 |
wint_t towlower( wint_t wc ) This function converts a wide character to lowercase.
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| 16 |
wint_t towupper(wint_t wc) This function converts a wide character to uppercase.
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| 17 |
wint_t towctrans( wint_t wc, wctrans_t desc ) This function performs character mapping according to the specified LC_CTYPE mapping category.
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| 18 |
wctrans_t wctrans( const char* str ) This function looks up a character mapping category in the current C locale.
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