From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/string%2Fbyte%2Fisdigit.html | 115 --------------------------------- 1 file changed, 115 deletions(-) delete mode 100644 devdocs/c/string%2Fbyte%2Fisdigit.html (limited to 'devdocs/c/string%2Fbyte%2Fisdigit.html') diff --git a/devdocs/c/string%2Fbyte%2Fisdigit.html b/devdocs/c/string%2Fbyte%2Fisdigit.html deleted file mode 100644 index b3c3ec37..00000000 --- a/devdocs/c/string%2Fbyte%2Fisdigit.html +++ /dev/null @@ -1,115 +0,0 @@ -

isdigit

Defined in header <ctype.h> 
int isdigit( int ch );
-

Checks if the given character is a numeric character (0123456789).

-

The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.

-

Parameters

- -
ch - character to classify

Return value

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

-

Notes

isdigit and isxdigit are the only standard narrow character classification functions that are not affected by the currently installed C locale, although some implementations (e.g. Microsoft in 1252 codepage) may classify additional single-byte characters as digits.

-

Example

#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");
-}

Output:

-
0123456789

References

See also

- -
-
(C95)
 checks if a wide character is a digit
(function)
C++ documentation for isdigit
- - - - - - - - - - - - - - - - - -
ASCII values characters

iscntrl
iswcntrl

-

isprint
iswprint

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isspace
iswspace

-

isblank
iswblank

-

isgraph
iswgraph

-

ispunct
iswpunct

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isalnum
iswalnum

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isalpha
iswalpha

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isupper
iswupper

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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/byte/isdigit -

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