C++ <cwctype> - iswctype() Function
The C++ <cwctype> iswctype() function checks whether the wide character wc has the property specified by desc.
The setting of the LC_CTYPE category at the time of calling the function will be the same as when wctype() was called to obtain desc. A specific locale can accept multiple categories in which to classify its characters. At least the following properties supported in all C locales are as follows:
| string passed to wctype() function | Description |
|---|---|
| "alnum" | alphanumerical character iswalnum() |
| "alpha" | letter character iswalpha() |
| "blank" | blank character iswblank() (C++11) |
| "cntrl" | control character iswcntrl() |
| "digit" | decimal digit character iswdigit() |
| "graph" | character with graphical representation iswgraph() |
| "lower" | lowercase letter character iswlower() |
| "print" | printable character iswprint() |
| "punct" | punctuation character iswpunct() |
| "space" | white-space character iswspace() |
| "upper" | uppercase letter character iswupper() |
| "xdigit" | hexadecimal digit character iswxdigit() |
Syntax
int iswctype(wint_t wc, wctype_t desc);
Parameters
wc |
Specify the wide character to be checked, casted to a wint_t value, or WEOF. |
desc |
Specify a LC_CTYPE category, obtained from a call to wctype(). |
Return Value
Returns a non-zero value if the character wc has the property identified by desc, zero otherwise.
Example:
The example below shows the usage of iswctype() function.
#include <cstdio>
#include <cwchar>
#include <cwctype>
int main (){
int i = 0;
wchar_t str[50] = L"99HEllo@";
wchar_t c;
//displaying the alphabetic
//character in lower case
wctype_t check = wctype("alpha");
wctrans_t trans = wctrans("tolower");
while (str[i]) {
c = str[i];
if (iswctype(c, check)) {
c = towctrans(c, trans);
putwchar (c);
}
i++;
}
return 0;
}
The output of the above code will be:
hello
❮ C++ <cwctype> Library
