isupper() -- ctype Function (libc)

Check if a character is an upper-case letter
#include <ctype.h>
int isupper(c) int c;

isupper() tests  whether the argument c is an  upper-case letter (A-Z).  It
returns a number other than zero  if c is an upper-case letter, and zero if
it is not.  isupper() assumes that c is an ASCII character or EOF.

Example

For an example of how to use this macro, see the entry for ctype.h.

See Also

ASCII,
libc
ANSI Standard, §7.3.1.10
POSIX Standard, §8.1

© 2012 by Stephen A. Ness