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Defined in header <wctype.h> | ||
int iswblank( wint_t ch); | (since C99) | |
Checks if the given wide character is classified as blank character (that is, a whitespace character used to separate words in a sentence) by the current C locale. In the default C locale, only space (0x20) and horizontal tab (0x09) are blank characters.
Contents |
| ch | - | wide character |
Non-zero value if the wide character is a blank character, zero otherwise.
ISO 30112 defines POSIX blank characters as Unicode characters U+0009, U+0020, U+1680, U+180E, U+2000..U+2006, U+2008, U+200A, U+205F, and U+3000.
#include <locale.h>#include <stdio.h>#include <wchar.h>#include <wctype.h> int main(void){wchar_t c= L'\u3000';// Ideographic space (' ')printf("In the default locale, iswblank(%#x) = %d\n", c,!!iswblank(c));setlocale(LC_ALL,"en_US.utf8");printf("In Unicode locale, iswblank(%#x) = %d\n", c,!!iswblank(c));}
Output:
In the default locale, iswblank(0x3000) = 0In Unicode locale, iswblank(0x3000) = 1
(C99) | checks if a character is a blank character (function)[edit] |
C++ documentation foriswblank | |
| ASCII values | characters | isblank | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | GHIJKLMNOPQRSTUVWXYZ | 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 | ghijklmnopqrstuvwxyz | 0 | ≠0 | 0 | 0 | ≠0 | 0 | ≠0 | ≠0 | 0 | ≠0 | 0 | 0 |
| 123–126 | \x7B–\x7E | \173–\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 |
