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isgraph

From cppreference.com
< c‎ | string‎ | byte
 
C
 
Strings library
 
Null-terminated byte strings
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(C11)(C11)
 
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.

Contents

[edit] Parameters

ch - character to classify

[edit] Return value

Non-zero value if the character has a graphical representation character, zero otherwise.

[edit] Example

Run this code
#include <ctype.h>
#include <locale.h>
#include <stdio.h>
 
int main(void)
{
    unsigned char c = '\xb6'; // the character ΒΆ 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 " );
}

Possible output: 

In the default C locale, \xb6 is not graphical
In ISO-8859-1 locale, \xb6 is graphical

[edit] References

  • C23 standard (ISO/IEC 9899:2024):
  • 7.4.1.6 The isgraph function (p: TBD)
  • C17 standard (ISO/IEC 9899:2018):
  • 7.4.1.6 The isgraph function (p: 146)
  • 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

[edit] See also

(C95)
 checks if a wide character is a graphical character
(function)