Syntax
#include <wctype.h> wint_t towlower(wint_t wc); wint_t towupper(wint_t wc);Description
towlower converts the uppercase letter wc to the corresponding lowercase letter.
towupper converts the lowercase letter wc to the corresponding uppercase letter.
The character mapping is determined by the LC_CTYPE category of current locale.
Both functions return the converted character. If the wide character wc does not have a corresponding lowercase or uppercase character, the functions return wc unchanged.
This example uses towlower and towupper to convert characters between 0 and 0x7f.
#include <wchar.h>
#include <stdio.h>
int main(void)
{
wint_t w_ch;
for (w_ch = 0; w_ch <= 0x7f; w_ch++) {
printf ("towupper : %#04x %#04x, ", w_ch, towupper(w_ch));
printf ("towlower : %#04x %#04x\n", w_ch, towlower(w_ch));
}
return 0;
/****************************************************************************
The output should be similar to :
.
:
towupper : 0x41 0x41, towlower : 0x41 0x61
towupper : 0x42 0x42, towlower : 0x42 0x62
towupper : 0x43 0x43, towlower : 0x43 0x63
towupper : 0x44 0x44, towlower : 0x44 0x64
towupper : 0x45 0x45, towlower : 0x45 0x65
.
:
towupper : 0x61 0x41, towlower : 0x61 0x61
towupper : 0x62 0x42, towlower : 0x62 0x62
towupper : 0x63 0x43, towlower : 0x63 0x63
towupper : 0x64 0x44, towlower : 0x64 0x64
towupper : 0x65 0x45, towlower : 0x65 0x65
:
****************************************************************************/
}
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