`wctrans`

Article
02/09/2023

Determines a mapping from one set of character codes to another.

Syntax

wctrans_t wctrans(
   const char *property
);

Parameters

property
A string that specifies one of the valid transformations.

Return value

If the LC_CTYPE category of the current locale doesn't define a mapping whose name matches the property string property, the function returns zero. Otherwise, it returns a nonzero value suitable for use as the second argument to a subsequent call to towctrans.

Remarks

This function determines a mapping from one set of character codes to another.

The following pairs of calls have the same behavior in all locales, but it's possible to define more mappings even in the "C" locale:

Function	Same As
`tolower(c)`	`towctrans(c, wctrans("towlower"))`
`towupper(c)`	`towctrans(c, wctrans("toupper"))`

Requirements

Routine	Required Header
`wctrans`	<wctype.h>

For more compatibility information, see Compatibility.

Example

// crt_wctrans.cpp
// compile with: /EHsc
// This example determines a mapping from one set of character
// codes to another.

#include <wchar.h>
#include <wctype.h>
#include <stdio.h>
#include <iostream>

int main()
{
    wint_t c = 'a';
    printf_s("%d\n",c);

    wctrans_t i = wctrans("toupper");
    printf_s("%d\n",i);

    wctrans_t ii = wctrans("towlower");
    printf_s("%d\n",ii);

    wchar_t wc = towctrans(c, i);
    printf_s("%d\n",wc);
}

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