isxdigit - cppreference.com (original) (raw)

| | | | | ----------------------- | | | | int isxdigit( int ch ); | | |

Checks if the given character is a hexadecimal numeric character (0123456789abcdefABCDEF) or is classified as a hexadecimal character.

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 is an hexadecimal numeric character, zero otherwise.

[edit] 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.

[edit] Example

#include <ctype.h> #include <limits.h> #include <stdio.h>   int main(void) { for (int ndx = 0; UCHAR_MAX >= ndx; ++ndx) if (isxdigit(ndx)) printf("%c", ndx); printf("\n"); }

Output:

[edit] References

• C23 standard (ISO/IEC 9899:2024):

• 7.4.1.12 The isxdigit function (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.4.1.12 The isxdigit function (p: 147)

• C11 standard (ISO/IEC 9899:2011):

• 7.4.1.12 The isxdigit function (p: 203)

• C99 standard (ISO/IEC 9899:1999):

• 7.4.1.12 The isxdigit function (p: 184)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.3.1.11 The isxdigit function

[edit] See also