isgraph

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

Return value

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

Example

#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 " );
}

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