.TH isxdigit() "" "" "ctype Function (libc)"
.II "hexadecimal numeral, check if character is"
.PC "Check if a character is a hexadecimal numeral"
\fB#include <ctype.h>\fR
\fBint isxdigit(\fIc\^\fB)\fR
\fBint \fIc\^\fB;\fR
.PP
.B isxdigit()
tests whether
.I c
is a hexadecimal numeral \(em that is,
any of the characters `0' through `9',
any of the letters `a' through `d', or any
of the letters `A' through `D'.
.I c
must be a value that is representable as an
.B "unsigned char"
or
.BR EOF .
.PP
.B isxdigit()
returns nonzero if
.I c
is a hexadecimal numeral, and zero if it is not.
.SH "See Also"
.Xr "ASCII," ascii
.Xr "libc" libc
.br
\*(AS, \(sc7.3.1.11
.br
\*(PX Standard, \(sc8.1

