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isdigit cppreference.com
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isdigit

cppreference.com
< c | string | byte
<tbody> </tbody>
<ctype.h>
int isdigit( int ch );

, (0123456789).

, ch unsigned char EOF.

ch

, , .

isdigit isxdigit , C, (., Microsoft 1252) .

#include <stdio.h>
#include <ctype.h>
#include <limits.h>
 
int main(void)
{
    for (int ndx=0; ndx<=UCHAR_MAX; ndx++)
        if (isdigit(ndx)) printf("%c", ndx);
    printf("\n");
}

:

0123456789

  • C17 (ISO/IEC 9899:2018):
  • 7.4.1.5 isdigit (. 146)
  • C11 (ISO/IEC 9899:2011):
  • 7.4.1.5 isdigit (. 201)
  • C99 (ISO/IEC 9899:1999):
  • 7.4.1.5 isdigit (. 182)
  • C89/C90 (ISO/IEC 9899:1990):
  • 4.3.1.4 isdigit

.

,
:
checks if a wide character is a digit
Google.
. .

() []
C++ isdigit
ASCII

iscntrl
iswcntrl

isprint
iswprint

isspace
iswspace

isblank
iswblank

isgraph
iswgraph

ispunct
iswpunct

isalnum
iswalnum

isalpha
iswalpha

isupper
iswupper

islower
iswlower

isdigit
iswdigit

isxdigit
iswxdigit

08 \x0\x8 \0\10 (NUL . .) 0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 (\t) 0 0 0 0 0 0 0 0 0 0 0 0
1013 \xA\xD \12\15 - (\n, \v, \f, \r) 0 0 0 0 0 0 0 0 0 0 0 0
1431 \xE\x1F \16\37 0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 0 0 0 0 0 0 0 0 0 0 0 0
3347 \x21\x2F \41\57 !"#$%&'()*+,-./ 0 0 0 0 0 0 0 0 0 0 0 0
4857 \x30\x39 \60\71 0123456789 0 0 0 0 0 0 0 0 0 0 0 0
5864 \x3A\x40 \72\100 :;<=>?@ 0 0 0 0 0 0 0 0 0 0 0 0
6570 \x41\x46 \101\106 ABCDEF 0 0 0 0 0 0 0 0 0 0 0 0
7190 \x47\x5A \107\132 GHIJKLMNOP
QRSTUVWXYZ
0 0 0 0 0 0 0 0 0 0 0 0
9196 \x5B\x60 \133\140 [\]^_` 0 0 0 0 0 0 0 0 0 0 0 0
97102 \x61\x66 \141\146 abcdef 0 0 0 0 0 0 0 0 0 0 0 0
103122 \x67\x7A \147\172 ghijklmnop
qrstuvwxyz
0 0 0 0 0 0 0 0 0 0 0 0
123126 \x7B\x7E \172\176 {|}~ 0 0 0 0 0 0 0 0 0 0 0 0
127 \x7F \177 (DEL) 0 0 0 0 0 0 0 0 0 0 0 0

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