From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/string%2Fwide%2Fiswdigit.html | 145 ++++++++++++++++++++++++++++++++ 1 file changed, 145 insertions(+) create mode 100644 devdocs/c/string%2Fwide%2Fiswdigit.html (limited to 'devdocs/c/string%2Fwide%2Fiswdigit.html') diff --git a/devdocs/c/string%2Fwide%2Fiswdigit.html b/devdocs/c/string%2Fwide%2Fiswdigit.html new file mode 100644 index 00000000..f65568b9 --- /dev/null +++ b/devdocs/c/string%2Fwide%2Fiswdigit.html @@ -0,0 +1,145 @@ +

iswdigit

Defined in header <wctype.h> 
int iswdigit( wint_t ch );
+		 (since C95)

Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789.

+

Parameters

+ +
ch - wide character

Return value

Non-zero value if the wide character is a numeric character, zero otherwise.

+

Notes

iswdigit and iswxdigit are the only standard wide character classification functions that are not affected by the currently installed C locale.

+

Example

+

Some locales offer additional character classes that detect non-ASCII digits

+
#include <locale.h>
+#include <stdio.h>
+#include <wchar.h>
+#include <wctype.h>
+ 
+void test(wchar_t a3, wchar_t u3, wchar_t j3)
+{
+    printf("\t '%lc'  '%lc' '%lc'\n", a3, u3, j3);
+    printf("iswdigit: %d    %d    %d\n",
+           !!iswdigit(a3),
+           !!iswdigit(u3),
+           !!iswdigit(j3));
+    printf("jdigit:   %d    %d    %d\n",
+           !!iswctype(a3, wctype("jdigit")),
+           !!iswctype(u3, wctype("jdigit")),
+           !!iswctype(j3, wctype("jdigit")));
+}
+ 
+int main(void)
+{
+    wchar_t a3 = L'3';  // the ASCII digit 3
+    wchar_t u3 = L'三'; // the CJK numeral 3
+    wchar_t j3 = L'３'; // the full-width digit 3
+ 
+    setlocale(LC_ALL, "en_US.utf8");
+    puts("In American locale:");
+    test(a3, u3, j3);
+ 
+    setlocale(LC_ALL, "ja_JP.utf8");
+    puts("\nIn Japanese locale:");
+    test(a3, u3, j3);
+}

Possible output:

+
In American locale:
+         '3'  '三' '３'
+iswdigit: 1    0    0
+jdigit:   0    0    0
+ 
+In Japanese locale:
+         '3'  '三' '３'
+iswdigit: 1    0    0
+jdigit:   0    0    1

References

See also

+ +
checks if a character is a digit
(function)
C++ documentation for iswdigit
+ + + + + + + + + + + + + + + + + +
ASCII values characters

iscntrl
iswcntrl

+

isprint
iswprint

+

isspace
iswspace

+

isblank
iswblank

+

isgraph
iswgraph

+

ispunct
iswpunct

+

isalnum
iswalnum

+

isalpha
iswalpha

+

isupper
iswupper

+

islower
iswlower

+

isdigit
iswdigit

+

isxdigit
iswxdigit

+
decimal hexadecimal octal
0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) +≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 tab (\t) +≠0 0 +≠0 +≠0 0 0 0 0 0 0 0 0
10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) +≠0 0 +≠0 0 0 0 0 0 0 0 0 0
14–31 \xE–\x1F \16–\37 control codes +≠0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 space 0 +≠0 +≠0 +≠0 0 0 0 0 0 0 0 0
33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
48–57 \x30–\x39 \60–\71 0123456789 0 +≠0 0 0 +≠0 0 +≠0 0 0 0 +≠0 +≠0
58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
65–70 \x41–\x46 \101–\106 ABCDEF 0 +≠0 0 0 +≠0 0 +≠0 +≠0 +≠0 0 0 +≠0
71–90 \x47–\x5A \107–\132 GHIJKLMNOP
QRSTUVWXYZ 		0 +≠0 0 0 +≠0 0 +≠0 +≠0 +≠0 0 0 0
91–96 \x5B–\x60 \133–\140 [\]^_` 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
97–102 \x61–\x66 \141–\146 abcdef 0 +≠0 0 0 +≠0 0 +≠0 +≠0 0 +≠0 0 +≠0
103–122 \x67–\x7A \147–\172 ghijklmnop
qrstuvwxyz 		0 +≠0 0 0 +≠0 0 +≠0 +≠0 0 +≠0 0 0
123–126 \x7B–\x7E \172–\176 {|}~ 0 +≠0 0 0 +≠0 +≠0 0 0 0 0 0 0
127 \x7F \177 backspace character (DEL) +≠0 0 0 0 0 0 0 0 0 0 0 0
+

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Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/string/wide/iswdigit +

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