isgraph
Defined in header <ctype.h>
|
||
int isgraph( int ch ); |
||
Checks if the given character has a graphical representation, i.e. it is either a number (0123456789
), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ
), a lowercase letter (abcdefghijklmnopqrstuvwxyz
), or a punctuation character(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
), or any graphical character specific to the current C locale.
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 has a graphical representation character, zero otherwise.
Example
Run this code
#include <stdio.h> #include <ctype.h> #include <locale.h> int main(void) { unsigned char c = '\xb6'; // the character ¶ in ISO-8859-1 printf("In the default C locale, \\xb6 is %sgraphical\n", isgraph(c) ? "" : "not " ); setlocale(LC_ALL, "en_GB.iso88591"); printf("In ISO-8859-1 locale, \\xb6 is %sgraphical\n", isgraph(c) ? "" : "not " ); }
Output:
In the default C locale, \xb6 is not graphical In ISO-8859-1 locale, \xb6 is graphical
References
- C11 standard (ISO/IEC 9899:2011):
- 7.4.1.6 The isgraph function (p: 201-202)
- C99 standard (ISO/IEC 9899:1999):
- 7.4.1.6 The isgraph function (p: 182-183)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.3.1.5 The isgraph function
See also
(C95) |
checks if a wide character is a graphical character (function) |
ASCII values | characters |
isgraph |
|||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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
|