.TH isalpha() "" "" "ctype Function (libc)"
.PC "Check if a character is a letter"
\fB#include <ctype.h>\fR
\fBint isalpha(\fIc\^\fB) int \fIc\^\fB;\fR
.PP
.B isalpha()
tests whether
the argument \fIc\fR is a letter (\fBA-Z\fR or \fBa-z\fR).
It returns a number other than zero
if \fIc\fR is an alphabetic character, and
zero if it is not.
.B isalpha()
assumes that \fIc\fR is an ASCII character or EOF.
.SH Example
For an example of this macro, see the entry for
.BR ctype.h .
.SH "See Also"
.Xr "ASCII," ascii
.Xr "libc" libc
.br
\*(AS, \(sc7.3.1.2
.br
\*(PX Standard, \(sc8.1
