.TH isupper() "" "" "ctype Function (libc)"
.PC "Check if a character is an upper-case letter"
\fB#include <ctype.h>\fR
\fBint isupper(\fIc\^\fB) int \fIc\^\fB;\fR
.PP
.B isupper()
tests whether the argument \fIc\fR is an upper-case letter (\fBA-Z\fR).
It returns a number other than zero
if \fIc\fR is an upper-case letter, and
zero if it is not.
.B isupper()
assumes that \fIc\fR is an ASCII character or
.BR EOF .
.SH Example
For an example of how to use this macro, see the entry for
.BR ctype.h .
.SH "See Also"
.Xr "ASCII," ascii
.Xr "libc" libc
.br
\*(AS, \(sc7.3.1.10
.br
\*(PX Standard, \(sc8.1
