towlower(), towupper() — Convert wide character case

Standards

Format

#include <wctype.h>

wint_t towlower(wint_t wc);
wint_t towupper(wint_t wc);

General description

Converts wc to the corresponding lowercase letter. The towupper() function converts wc to the corresponding uppercase letter.

Returned value

If wc is a wide character for which iswupper() (or iswlower()) is true and there is a corresponding wide character for which iswlower() (or iswupper()) is true, towlower() (or towupper()) returns the corresponding wide character; otherwise, wc is returned unchanged.

Related information

• wctype.h
• iswalnum() to iswxdigit() — Test wide integer value
• tolower(), toupper() — Convert character case