ISUPPER(3) NEWLIB ISUPPER(3)NAME
3.10 `isupper'--uppercase character predicate
SYNOPSIS
#include <ctype.h>
int isupper(int C);
DESCRIPTION
`isupper' is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for uppercase letters
(`A'-`Z'), and 0 for other characters. It is defined only when `isas‐
cii'(C) is true or C is EOF.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using ``#undef isupper''.
RETURNS
`isupper' returns non-zero if C is a uppercase letter (A-Z).
PORTABILITY
`isupper' is ANSI C.
No supporting OS subroutines are required.
SEE ALSOisupper is part of the library. The full documentation for is main‐
tained as a Texinfo manual. If info and are properly installed at your
site, the command
info
will give you access to the complete manual.
NEWLIB April 2010 ISUPPER(3)
