isgraph - cppreference.com (original) (raw)

| | | | | ---------------------- | | | | 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.

[edit] Parameters

[edit] Return value

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

[edit] Example

#include <ctype.h> #include <locale.h> #include <stdio.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 " ); }

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